KJ's Educational Institute

TRINITY ACADEMY OF ENGINEERING, PUNE

(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

Department: Mechanical Engineering Subject: Advanced Manufacturing Processes

Multiple Choice Questions

Unit 1:Special Forming Processes

1. Which word best describes the roll forming?

a) Die forming b) Coining c) Progressive d) Profiling

Answer: c
Explanation: Roll forming is a continuous process for forming sheet, strip or coiled metal stock into
long shapes of essentially uniform cross-section. The material is fed through pairs of contoured
forming rolls, which progressively shape the metal until the desired cross-section is produced.

2. Which of the following are the most desirable materials used in roll forming?
a) Spring steel b) Chromium-molybdenum steel c) Non-metals d) Mild steels and aluminium

Answer: d
Explanation: Both ferrous and non-ferrous metals as well as some non-metallic material can be roll
formed. Mild steel and aluminium are the most common materials used in the process. Additionally,
polished, painted, coated and plated materials can also be roll formed.

The most common cutting method of roll forming is

a) sawing b) pre-cutting c) parting d) post-cutting

Answer:d
Explanation: The stock to be roll formed may be either pre-cut to a pre-determined length before roll
forming, or post-cut afterward to a specified dimension. But the latter one is the most common. By
incorporating auxiliary equipment such as pre-notching, punching, embossing, etc. the post-cut
method can be a complete net-shape process, fully automated.

9. Which of the following is the most common material used to produce forming rolls?
a) Aluminium b) Carbide c) Chrome steels d) Oil hardened tool steels

Answer:d
Explanation: Several types of materials are used in the manufacture of the forming rolls and oil

Page 1
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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

hardened tool steel being the most common. For extended tool life, hardened high-carbon, high-
chromium too steels are used. On extremely tough forming applications involving high temperatures
and or abrasive materials, aluminium/bronze or carbide rolls are required.

10. Which of the following is used for lubrication in heavy-duty roll forming?
a) Extreme pressure-type solutions b) Soap-type solutions
c) Non-ionic type solutions d) Micro-emulsions

Answer: b
Explanation: The soap-type solutions are used for heavy-duty roll forming. Non-ionic type solutions
are excellent for roll forming aluminium and coated components and extreme pressure-type are used
for high strength alloys.

11. The following image is forming processes

a)High Rate Energy b)Roll c) Stretch d)Spin

Ans:-b

12. In HREF high energy is applied for interval of time.

a)Short b) Long c) Medium

Ans:-a

13. HERF is not suitable for Materials.

a)Brittle b)Soft c) Tough d)hollow

Ans:- a

14. In HREF dies need to be much bigger to withstand high energy rates and shocks and to
prevent .

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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

a)Deformation b)Elongation c)Cracking d)Bulk

Ans:-c

15. In forming TNT, RDX and Dynamite is used.

a)Roll b)Spin c)explosive d)HERF e) c & d both

Ans:-e

16. The following Image related to forming processes.

a) Roll b)Electro Hydraulic c)explosive d)petro-forge

e)Stretch

Ans:- c)

17. In uncofined type explosive forming the is necessary in the die to prevent
adiabatic heating of the work which may lead to oxidation or melting.
a)water b)air c)vacuum d)explosive
Ans:- c.

18. The characteristics of forming are similar to those of explosive forming.

a)HERF b) Roll c)High Velocity d)Electro Hydraulic
Ans:-d

19. Like chemical explosive in HERF, Electro hydraulic forming used .

a)capacitor Bank b)pressure c)airgap d)current

Page 3
 KJ's Educational Institute
TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

Ans:-a

20. The following diagram related with forming process.

a)Roll b)Electro Hydraulic c)explosive d)petro-forge e)Stretch

Ans:-b

21. In electromagnetic forming, coil is firmly held and hence the work piece collapses into the
die cavity due to . thus assuming die shape.
a.air gap b)vacuum c)current d)magnetic repelling force
Ans:-d

22. The following Image related to forming processes.

a) Hydro forming b)Electro Hydraulic c)explosive d)Electromagnetic e)Stretch

Ans:-d
23. What is (are) the limitation(s) of electromagnetic forming.
a) Applicable only for electrically conducting materials. b) Not suitable for large work pieces.
c) Rigid clamping of primary coil is critical. d)All of these.
Ans:-d

24. is a process related to conventional spinning and is also known as flow

turning or spin forging.
a)Flow spinning b)Shear Spinning c)Metal Spinning d)roll forming
Ans:-b

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 KJ's Educational Institute
TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

25. The following Image related to forming processes.

a) shear b)Sheet metal spinning c)Roll d)None of These

Ans:-b

26. Which of the following is Not the type of Bulk forming processes.
a)Wire Drawing b)Bending c)Rolling d)Forging
Ans:-b

27. Which of the following is Not the type of Sheet Metal forming processes.
a)Bending b)Deep Drawing c)Shearing d)Extrusion
Ans:-d
28. Which of the following is Not the type of HREF processes.
a)Electromagnetic Forming b)Explosive forming c)Electro hydraulic d)Forge forming
Ans:- d
29. . The following Image related to forming processes.

a)Stand-off technique b)Roll forming c) Explosive Forming d)vacuum Forming

Ans:-c
30. Which of these not a type of Magnetic Pulse forming process.
a)Swaging Method b)Reduction Method c)Expanding Method d)Embossing Method
Ans:-b
31. In EHF the energy of shock wave and pressure pulse generated depends on size of .
a)die b)workpiece c)capacitor d)sparking electrode
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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

Ans:-c

32. The following figure related to forming process.

a)Tube Hydro b)Sheet Hydro c)vacuum pressure d)High pressure

Ans:-b
33. forming is Single Tool Technology aas there is no need of the expensive matched of
male /female die sets.
a)Tube Hydro b)Sheet Hydro c) vacuum pressure d)High pressure
Ans:-b
34The following figure related with forming process.

a)Sheet metal Spinning b)Shear Spinning c)Flow d)circular

35. Large plastic deformation while thinning of the blank is involved in process.
a)Sheet metal Spinning b)Shear Spinning c)Flow d)circular
Ans:- b
36. From which of the following is not the process variable of spinning.
a)Roller Path b)spindle Speed c)Sheet Material d)Feed Ratio
Ans:-c
37. forming process is also called as Tube Spinning.
a)Sheet metal Spinning b)Shear Spinning c)Flow d)circular
Ans:- c
38. The process involves applying compression to the outside diameter of cylindrical
perform by combination of axial an radial forces using a set three or four rollers.
a)Sheet metal Spinning b)Shear Spinning c)Flow forming d)Roll forming
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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

Ans:-c
40. The following figure related to process.

a)Sheet metal Spinning b) Forward Flow forming c)Backward Flow forming d)Roll forming
Ans:-b.
41. In proess, it does not required lubrication.
a) Stretch b)roll c)Shear flow d)Incremental Shear
Ans:-a
42. The process is also known as single point forming.
a) Stretch forming b)roll process forming c)Shear flow process forming
d)Incremental Shear forming Ans:-d
43. The following figure related to forming process.

a) Stretch b)roll c)Shear flow d)Incremental Shear

Ans:-d
44. process is similar to process that takes place in an internal combustion engine.
a)Petro-forge forming b)Explosive forming c)Hydro forming d)None of these.
Ans:-a
45. process is used to high speed forging, for bar cropping, for hot forging of gears,
metal powder compaction and sheet blanking etc.
a)Petro-forge forming b)Explosive forming c)Hydro forming d)Sheet shearing

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 KJ's Educational Institute
TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

Ans:-a
46. The following figure related to process.

a)Petro-forge forming b)Explosive forming c)Hydro forming d)Sheet shearing

Ans:-a

Short Questions for 1marks and 2 marks .

What are the Characteristics of Electro-hydraulic Forming?
What is Micro conning and micro forming?
What is -Extrusion and Fine blanking?
Explain Principle of Micro Bending/Laser Bending Process.
What is the one main difference in Shear spinning and Metal Sheet Spinning?
States specification of Stretch forming.
What are different parameters of EHF?
What are the different component in Incremental Shear forming?
What are the different variables of spinning process?

Page 8
 KJ's Educational Institute
TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

Department: Mechanical Engineering Subject: Advanced Manufacturing Processes

Multiple Choice Questions

Unit 2 Advance Joining Processes

1. Friction welding produces welds due to
a) electrode melting
b) workpiece melting
c) relative motion between work pieces
d) adhesive force between workpiece particles

Answer: c
Explanation: Friction Welding (FRW) is a solid state welding process which produces welds
due to the compressive force contact of work pieces which are either rotating or moving relative
to one another.

2. In friction welding, material is deformed due to

a) elastic deformation
b) plastic deformation
c) ductile deformation
d) brittle deformation

Answer: b
Explanation: In friction welding the heat required to produce the joint is generated by friction heating at
the interface. This heat displaces material plastically from the faying surfaces.

3. Which of the following is true about friction welding?

a) One workpiece is held stationary while the other is moving
b) Both the workpieces are moving
c) Both the workpieces are stationary and filler is added in the space between them
d) The material is deformed elastically
Answer: a
Explanation: The components to be joined are first prepared to have smooth, square cut surfaces. One
piece is held stationary while the other is mounted in a motor driven chuck or collet and rotated against
it at high speed.

4. During friction welding, initially low pressure is applied. Why?

a) For slowly increasing the surface temperature
b) For melting the surface coating on the materials

1
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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
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c) To check weldabilty of two materials

d) For initial cleaning of the surface

Answer: d
Explanation: A low contact pressure may be applied initially to permit cleaning of the surfaces
by a burnishing action. This pressure is then increased and contacting friction quickly generates
enough heat to raise the abutting surfaces to the welding temperature.

5. After the welding temperature is reached _

a) rotation is stopped
b) speed of rotation is increased
c) rotation of first workpiece is stopped and second workpiece starts rotating
d) filler material is added

Answer: a
Explanation: As soon as the welding temperature is reached, rotation is stopped and the pressure is
maintained or increased to complete the weld. The softened material is squeezed out to form a flash. If
desired, the flash can be removed by subsequent machining action.

6. By friction welding, steel bars upto mm diameter can be welded.

a) 10
b) 50
c) 100
d) 210

Answer: c
Explanation: During friction welding, a forged structure is formed in the joint. Friction welding
has been used to join steel bars upto 100 mms in diameter and tubes with outer diameter upto
100 mm.

7. Inertia welding is a modified form of friction welding.

a) True
b) False

Answer: a
Explanation: Inertia welding is a modified form of friction welding, where the moving piece is attached
to a rotating flywheel. The flywheel is brought to a specified rotational speed and is then separated from
the driving motor.

8. Which of the following is not true about inertia welding?

a) Weld is formed when the flywheel stops

2
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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

b) The process is difficult for automation

c) Weld quality is consistent
d) Parts remain in contact even after the weld is completed

Answer: b
Explanation: The weld is formed when the flywheel stops its motion and the pieces remain
pressed together. Since the conditions of the inertia welding are easily duplicated, welds of
consistent quality can be produced and the process can be easily automated.

9.Which of the following materials cannot be welded by friction welding?

a) Aluminium
b) Copper
c) Stainless steel
d) Non-forgeable materials

Answer: d
Explanation: Dry bearing and non-forgeable materials cannot be welded by a friction welding
process, i.e., one of the components must be ductile when hot, to permit deformations.
Preparation and alignment of the workpieces of the workpieces may be critical for developing
for developing uniform rubbing and heating, particularly for pieces having diameters larger
than 50mm.

10.Aluminium is difficult to friction weld because of

a) ductility
b) softness
c) micro porosity
d) heat reflectivity

Answer: c
Explanation: The basic problems with friction welding of aluminium and its alloys are that they
possess:
• Cast brittle dendritic structure
• Micro porosity
• Loss of strength in heat affected zone
11. Which of the following processes can be used as alternative technique for joining
aluminium and its alloys?
a) Tungsten inert-gas welding
b) Metal inert-gas welding

3
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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

c) Friction stir welding

d) Oxy-Acetylene flame technique

Answer: c
Explanation: The following alternate techniques are being used for joining of aluminium and its
alloys:
• Electron beam welding
• Laser beam welding
• Variable polarity plasma arc welding
• Friction stir welding.

12. All metallic engineering materials which are can be friction welded.
a) soft
b) weldable
c) forgeable
d) metamaterials

Answer: c
Explanation: As a rule, all metallic engineering materials which are forgeable can be friction
welded, including automotive valve alloys, maraging steel, tool steel, alloy steels and tantalum.
In addition, many castings, powder metals and metal matrix composites are weldable.

13.Friction welding produces quality joints, with a 100% weld.

a) lap joint
b) tee-joint
c) butt joint
d) edge joint

Answer: c
Explanation: Friction welding produces forged quality joints, with a 100% butt joint weld
through the contact area. Furthermore, in friction welding heat affected zone is much narrower
as compared to other welds, which indeed reduces the cost of post-weld heat treatments (stress
relieving processes).

14. generated during friction welding is coherent.

a) Burr
b) Molten metal
c) Flash curl
d) Fly ash

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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

Answer: c
Explanation: The flash curl generated during welding is coherent, will not flake off, and can
often be left intact if design and engineering considerations allow. Alternately, parts can
frequently be designed to accommodate the flash curl in a recess (flash trap).

15. Which of the following is not the advantage of friction welding?

a) No smoke generation during the process
b) Less sparks are produced during the process
c) Applicable for all metals
d) Time saving process

Answer: c
Explanation: The advantages of this process such as no smoke, fumes or gases, or few sparks
produced, and the fact that the process is machine-controlled, make it suitable for use in
potentially explosive or hazardous environments. The machine can be fully automated so the
operator can be safely located out of harm’s way. This process is not applicable to non-
forgeable metals.

16.From given below which one is not the processes parameter of FSW.

a)Rotation Speed b)Tilting angle c)Material used d)Down force

Ans:- c

17.In FSW small change in shape of tool can cause significance change in and
quality of weld.

a)Operational Speed b)tool quality c)feed d)removed chips

Ans:- Operational Speed

18. is the period of the starting stage of welding process in FSW.

a)Transient stage b)Dwell c)Pseudo Steady State d)none of these

Ans:-Dwell

19. is the constant eat generation starts in the beginning of the process.

a) Transient heat b)Dwell c)Pseudo Steady State d)none of these

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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

ANS:-a

20. - is the stage in which the thermal zone around the tool becomes steady.

a)Transient stage b)Dwell c)Pseudo Steady State d)none of these

Ans:-c

21.In electron beam welding the tungsten filament heated upto high temperature at
degree Celsius.

a)2500 b)2200c)3000 d)1800

Ans:-2500

22..In electron beam welding the filament heated upto high temperature at 2500 degree
Celsius.

a)Titanium b)Carbide tool c)Tungsten d)steel alloy

Ans:-Tungsten

23.From the following image one D shows zone.

a)Parent Metal b)Heat Affected c)Thermo Mechanical Effected d)Weld Nugget

Ans:-d

24.From the following image one C shows zone.

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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

a)Parent Metal b)Heat Affected c)Thermo Mechanical Effected d)Weld Nugget

Ans:-c

25.From the following image one B shows zone.

a)Parent Metal b)Heat Affected c)Thermo Mechanical Effected d)Weld Nugget

Ans:-b

26.From the following image one A shows zone.

a)Parent Metal b)Heat Affected c)Thermo Mechanical Effected d)Weld Nugget

Ans:-a

27.In electronic beam welding depth of penetration is depending upon _ .

a)Electronic beam power b)acceleration voltage c)beam current d)None of these.

Ans:-b

28.In Laser Beam Welding - used to emit light.

a)cadmium lamp b)florescent lamp c)Flash lamp d)None of these

Ans:-c

29. Laser beam welding is a joining process.

a) fission b) fusion c) coherent d) plastic

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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

Answer: b
Explanation: Laser is an acronym for light amplification by stimulated emission of radiation.
Laser Beam Welding (LBW) is a fusion joining process that produces coalescence of materials
with the heat obtained from a concentrated beam of coherent, monochromatic light impinging
on the joint to be welded.

30. Which of the following is used to direct laser beam?

a) glass apertures b) perforated glass sheets c) flat optical elements
d) electro-magnetic coils

Answer: c
Explanation: In the LBM process, the laser beam is directed by flat optical elements, such as
mirrors and then focused to a small spot (for high power density) at the workpiece using either
reflective focusing elements or lenses.

31. In case of laser welding, heat input is to fuse the weld metal.
a) equal to the required amount b) close to the minimum required
c) greater by 200 J than required d) approximately higher by atleast 320 J

Answer: b
Explanation: Following are the few advantages of Laser Beam Welding:
• Heat input is close to the minimum required to fuse the weld metal
• Reduced heat affected zones
• Workpiece distortions are minimized due to smaller heat affected zones.

32..In LBW the atoms of absorb the energy and electron of those atoms get
excited.

a)Ruby crystal b)Quarts Crystal c)Swiss quartz crystal d) diamond crystal

Ans:-a

33. Tool in USM is generally made from which of the following materials?
a) Glass b) Ceramic c) Carbides d) Steel

Ans:-d

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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

Explanation: The tool material should be such that indentation by the abrasive grits does not
lead to brittle failure. Thus the tools are made of tough, strong and ductile materials like steel,
stainless steel and other ductile metallic alloys.

34. In ultrasonic machining, the abrasive particles act as the

a) chip carriers b) intenders c) finishing particles

d) thickening agent for the slurry

Answer: b
Explanation: During ultrasonic machining, as the tool vibrates over the workpiece, the abrasive
particles act as the indenters and indent both the work material and the tool.

35. During USM, cracks are produced due to

a) von-mises stresses b) hertzian stresses c) principal stresses
d) episodic acute stresses

Answer: b
Explanation: During USM, as the tool vibrates, it leads to the indentation of the abrasive grits.
During indentation, due to hertzian contact stresses, cracks would develop just below the
contact site then as indentation progresses the cracks would propagate due to increase in stress
and ultimately lead to brittle fracture of the work material under each individual interaction site
between the abrasive grits and the workpiece.

36. Increasing volume concentration of abrasive in slurry would affect MRR in which of the
following manner?
a) increase MRR
b) decrease MRR
c) would not change MRR
d) initially decrease and then increase MRR

Answer: a
Explanation: The concentration of abrasive grits in the slurry is related as follow
n = (6AC)/ πdg2,
where n= number of grits
A= total surface area of the tool facing the workpiece
C= concentration of abrasive grits in the slurry
dg= diameter of a grit
Thus above relation shows that any increase in ‘C’ will increase ‘n’ and hence material removal
rate (MRR).

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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

37. Which of the following material is not machined by USM?

a) Brittle metals b) Glass c) Ceramics d) Ductile materials

Answer: d
Explanation: USM is used for machining;
• hard metallic alloys • brittle metallic alloys • semiconductors • glass • ceramics
• carbides.

38. The development of USM was started in

a) 1920 b) 1927 c) 1947 d) 1980

Ans:-b

Explanation: The development of USM was started in 1927. It was accidentally discovered
during investigating the ultrasonic grinding of abrasive powders.

39. Which of the following is not a part of the ultrasonic machine used in USM?
a) Generator b) Acoustic head c) Slurry pump d) Lead-screw

Answer: d
Explanation: The basic ultrasonic equipment consists of, a generator for high frequency
oscillations; an acoustic head, consisting of a transducer and a horn also known as shank or
trunk; also, tool and abrasive slurry elements like pump and tank for slurry.

40. The tool is joined to the trunk by

a) riveted joint b) welded joint c) brazing d) honing

Answer: c
Explanation: The tool is attached to the trunk or the horn by silver brazing process. At times it
is fasten or the screwed to the trunk also. The commonly used tool materials are brass, high
speed steel, mild steel, silver, stainless steel, tungsten carbide and monel metal.

41.Which of these are(is) Not the thermal spray coating processes?

a)Wire frame spray b)Electric arc wire spray c)Plasma Spray

d)carbide coat Spray

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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

Ans:-d

42. The following figure shows the process.

a)Wire frame spray b)Electric arc wire spray c)Plasma Spray

d)High velocity oxy fuel Spray

Ans:-a)

43. In plasma spray coating the temperature of plasma is as much as degree Celsius

a)12000 b)14000 c)10000 d)16000

Ans:-16000

44. The process utilizes a combination of oxygen with various fuel gases hydrogen,
propane, propylene.

a)Plasma Spray b)Electric arc wire spray c)Plasma Spray

d)High velocity oxy fuel Spray

Ans:-d

45. The following diagram shows Process.

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a)Ultrasonic welding b)Electric arc wire spray c)Plasma Spray

d)High velocity oxy fuel Spray

Ans:-a

46.Material like Pentaerytritol Tetranitrate and Trinitrotoluene is used in

a)Electric Welding b)High Velocity oxy fuel spray c) Explosive welding

d)None of these

Ans:-c

47.In cryogenic welding the cryogenic phenomenon includes the material processing under
degree Celsius temperature.

a)-500 b)-50 c)-150 d)-300

Ans:- c

Descriptive Question for 1 and 2 Mark .

What are the different parameters of FSW.?

What are the metallurgical Advantages of FSW?

What are safety precautions in Underwater welding?

What are the applications of Thermal Spray coating?

Which area ultrasonic welding is applicable?

What are the applications of Laser Beam Welding?

Which are the tool materials applicable in FWS?

What is principle of Electronic Beam Welding?

State different welding zones.

12
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TRINITY ACADEMY OF ENGINEERING, PUNE
(Approved by AICTE, New Delhi, Govt. of Maharashtra & affiliated to SPPU, DTE Code: EN6634)
(Accredited by NAAC with ‘A’ Grade)

Department: Mechanical Engineering Subject: Advanced Manufacturing Processes

Multiple Choice Questions

Unit 3: Hybrid Non-conventional Machining Techniques

1. Which of the following non-conventional machining technologies.

a)Chemical Machining b)Thermal Machining c)Electrochemical Machining d)All of

these Ans:-d

2. STEM process is used in aerospace industries to drill the holes with high length to diameter ratio up to
.

a)200:1 b)100:1 c)150:1 d)300:1

Ans:- d

3. Generally in STEM process acid based electrolyte such as sulphuric acid having % concentration
in water.

a)50 b)20 c)10 d)5

Ans:-c

4. In STEM process how much low voltage applied across the gap as higher voltage causes boiling of
electrolyte which eventually damages the electrode coating.

a)5-15 V DC b)10-20 V DC c)1-5 v DC d)20-35 v DC

Ans:-a)

5. The following diagram is related with process.

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a) ECG b)STEM c)EDMd)EJM

6)Using STEM process Small holes in diameter with high length to diameter ratio.

a)0.76-1.62 mm b)1.2 - 2.4mm c)0.05 - 0.225mm d)0.95-3.32 mm

Ans:-a

7. Which material is used as a tool for STEM to resist acid attack by electrolyte.

a)Tungsten b)Aluminium c)Copper d)Titanium

Ans:-d

8. What is the machining current used in STEM process.?

a)200 AMP b)300 AMP c)500 AMP d)600AMP

Ans:-d

9. During the STEM process the tool feed rate is around mm/min.

a)0.75-3 b)2-5.5 c)4-8 d)0.15-0.75

Ans:-a

10. Amongs all these which of the material is not used commonly as bonding material in Electrochemical
Grinding.

a)Copper b)Cobalt c)Brass d) Nickel

Ans:-b

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11.A constant inter-electrode gap is maintained considering the grain size of the abrasive
particle.

a)0.025mm b)0.5mm c)1mm d)1-1.5mm

Ans:-a)

12. The following image related to process.

a)ECG b)STEM c)EJM d)Rotory EDM

Ans:-a

13. In Electrochemical Grinding the work piece act as anode.

a)True b)Falsec)not used in ECG

Ans:-a

14. In ECG the size of abrasive particle around grit number.

a)120-800 b)60-320 c)500-1200 d)100-1600

Ans:-b

15. The surface speed of the wheel during the operation is up to m/s.

a)5-10 b)10-15 c)20-35 d)85-110

Ans:-c

16. The depth of cut of the ECG process should be less than mm.

a)1 b)2 c)1.5 d)2.5

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Ans:-d.

17. The electrolyte used in the ECG are sodium chloride(NaCL) and Sodium Nitrate(NaNO3).

a)True b)False

18. .The surface speed of the grinding wheel during the operation is up to m/s.

a)100-200 b)300-500 c)1200-1800 d)2400-3600

Ans:-c

19. has significant effect on surface finish and material removal rate.

a)Current density b)Air gap c)Flow of electrolyte d)Feed

Ans:-a

20. The surface finish obtained in ECG is µm.

a)0.01-0.05 b)0.1-0.5 c)0.12-0.8 d)0.8-1.2

Ans:-c

21. The ELPD dresses of grinding wheels using the princople of electrolysis.

a)shape b)workpiece c)metal bond d) None of these

Ans:-c

22. The diagram below related to which process?

a)ELPD b)ECG c)EDM d)ECDM

Ans:-a

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23. The wheel loading and glazing can be eliminated by introducing electrolize cell.

a)True b)Flase Ans:-a

24. Whic hof th following is not the component of the ELPD.

a)Power Supply b)Abrasive Particle c)Electrolyte d)Electrode

Ans:-b

25. Electrode must be in size of the of the grinding wheel perimeter.

a)1/4 to 1/2 b)1/6th to 1/4 c)1/8 to 1/2 d)1/16 to 1/8

Ans:-b

26. In ECG, grinding action removes

a) workpiece material from the surface
b) corroded surface layer making workpiece ready for electro-chemical process
c) oxide film formed on the surface
d) particles removed from surface after chemical action

Answer: c
Explanation: ECG removes metal by combination of electro-chemical and grinding actions. The grinding
action removes the buildup of oxide film on the surface of the workpiece.

27. Electrolyte in ECG should provide

a) lower chemical activity
b) allowance to stray currents
c) high stock removal efficiency
d) higher corrosion tendency

Answer: c
Explanation: Desirable electrolyte should provide: high conductivity, high stock removal efficiency,
passivation to limit stray currents, good surface finishes and corrosion inhibition.

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28. Which of the following is true about ECG?

a) Lower MRRs when grinding hard, heat sensitive materials
b) Machining of soft metals like aluminium can be easily done
c) Difficult to machine materials with high hardness like tungsten carbide
d) Burr-free sharpening of needles

Answer: d
Explanation: Applications of ECG are as follows;
(1) Single largest use for ECG is in the manufacturing and remanufacturing of turbine blades and vanes
for aircraft turbine engines
(2) Grinding of tungsten carbide tool inserts
(3) Re-profiling worn locomotive traction motor gears
(4) Burr-free sharpening of hypodermic needles
(5) Grinding of surgical needles, other thin wall tubes, and fragile parts
(6) Machining of fragile or very hard and tough material – honey comb, thin walled tubes and skins
(7) High MRR’s when grinding hard, tough, stringy, work-hardenable or heat sensitive materials.

29.MRR is ECM depends on

a) hardness of work material

b) atomic weight of work material
c) thermal conductivity of work material
d) ductility of work material

nswer: b
Explanation: In ECM, material removal takes place due to an atomic dissolution of work material.
Electrochemical dissolution is governed by Faraday’s laws. Also, for ECM, MRR= IA/(Fρv), where I=
current, ρ= density of the material, A= atomic weight, v= valency, F= faraday’s constant.

30. Electrolyte used in ECM should have

a) high specific heat
b) lower resistance to film formation on the workpiece

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c) higher viscosity
d) corrosive nature

Answer: a
Explanation: Desirable properties of the electrolytes are as follows:
• High electrical conductivity – for easy ionization
• Low viscosity – for easy flow
• High specific heat – to carry more heat
• Chemical stability – to be chemically neutral or
does not disintegrate during the reaction

31.In which Process electrolytic aqueous solution uses 10 to 25%.

a)EJM b)EDM c) ELPD d)ECG

Ans:-a

32.In EJM a higher voltage of V is applied get longer and thinner flow of electrolyte .

a)50-100 b)150-750 c) 200-400 d)600-1000

Ans:-b

33. Laser Beam is produced due to

a) spontaneous emission
b) stimulated emission followed by spontaneous emission
c) spontaneous emission followed by Spontaneous absorption
d) spontaneous absorption leading to “population inversion” and followed by stimulated emission

Answer: d

Explanation: Lasing process describes the basic operation of laser, i.e. generation of a coherent (both
temporal and spatial) beam of light by “light amplification” using “stimulated emission”.

34. Which of the following processes does not use lasers?

a) Cladding
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b) Alloying
c) Nitriding
d) Cutting

Answer: c
Explanation: Laser Beam Machining or more broadly laser material processing deals with machining and
material processing like heat treatment, alloying, cladding, sheet metal bending, etc.

35. Laser causes a rapid substantial rise in of the material.

a) local temperature
b) local pressure
c) indentation
d) cracks

Answer: a
Explanation: As laser interacts with the material, the energy of the photon is absorbed by the work
material leading to rapid substantial rise in local temperature. This in turn results in melting and
vaporisation of the work material and finally material removal.

36. In laser beam machining, electrons are excited by

a) high temperature steam
b) flash lamps
c) flash torch
d) cathode ray tube

Answer: b
Explanation: Population inversion can be carried out by exciting the gas atoms or molecules by pumping
it with flash lamps. Then stimulated emission would initiate lasing action. Stimulated emission of
photons could be in all directions.

37. The depth of the surface modification depends on the heat input and the depth in the range of
is hardened using laser based heat treatment.

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a)0.025-0.01 b)0.25-2.5mm c)1.5-4.0 mm d)None of these

Ans:-b

38. In Abrasive flow finishing the viscoelastic medium is consisting of .

a) SiC, b) Al2O3 c) Boron Carbide d)all of These

Ans:-d

39. In magnetic abrasive finishing, particles mixed with the fine abrasive particles.

a)ferromagnetic b)SiC c)Al2O3 d)Silicate.

Ans:-a

40. The following figure is related with process.

a)AFF b)Magnetic Abrasive Finishing c)EDMd)WEDM

41.FMAB stands for

(This question does not cotain option)

42. In which process mechanical energy of water use and abrasive phase is use to achieve material
removal or machining.

a)AFF b)ECG c)AWJM d) FMAB

Ans:-c

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43. The following figure is shows the setup of process.

a)AFF b)AWJM c)EDM d)WEDM

Ans:-b

44. In Abrasive Water Jet Machining process, the water in converted into Kinetic energy, yielding a high
velocity jet of m/s.

a)100 b)200 c)500 d)1000

Ans:-d

45. In AWJM hydraulic intensifier increases water pressure of bar to about 3000-4000 bars.

a)4 b)10 c)16 d)24

Ans:-a

46. Wire-cut EDM can cut plates of thickness upto

a) 50mm
b) 100mm
c) 300mm
d) 500mm

Answer: c
Explanation: Wire-cut EDM process can cut plates as thick as 300mm and is used for making punches,
tools and dies from hard metals that are difficult to machine with other methods.

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47. In WEDM, the wire is held tight between _

a) upper and lower nozzles
b) upper and lower diamond guides
c) upper and lower groves in the handle
d) upper and lower pulleys

Answer: b
Explanation: In wire-cut EDM (WEDM), the wire which is constantly fed from a spool, is held between
upper and lower diamond guides. The guides are usually CNC-controlled and move in the x–y plane.

48. In the wire-cut EDM process, de-ionizing units are used for controlling the
a) feed rate
b) resistivity
c) burr formation
d) temperature of the wire

Answer: b
Explanation: In the wire-cut EDM process, water is commonly used as the dielectric fluid. Filters and de-
ionizing units are used for controlling the resistivity and other electrical properties.

49. The WEDM process requires

a) lower initial investment
b) lesser cutting forces
c) a skilled operator
d) a coolant pump

Answer: b
Explanation: The wire-cut EDM process requires lesser cutting forces in material removal; hence it is

generally used when lower residual stresses in the workpiece are desired.

50. During the WEDM process, workpiece undergoes a number of thermal cycles.
a) True
b) False
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Answer: a
Explanation: In WEDM process, the selection of process parameters is very crucial, as in some cases the
workpiece undergoes significant thermal cycles the can be very severe. These thermal cycles can form
recast layers and induce residual tensile stresses on the workpiece.

51. Electrically conductive materials are cut by WEDM process by _ mechanism.

a) thermal
b) electro-thermal
c) electro-dynamic
d) fused metal

Answer: b
Explanation: Electrically conductive materials are cut by WEDM process by an electro-thermal
mechanism. In the WEDM process, the motion of the wire is slow. It is fed in the programmed path and
material is removed from the workpiece accordingly.

52. The burr or cut particles are flushed away by the

a) electrode
b) motion of the workpiece
c) di-electric fluid
d) coolant

nswer: c
Explanation: The area wherein discharge takes place gets heated to very high temperatures such that the
surface gets melted and removed. The cut particles (debris) get flushed away by the continuously flowing
dielectric fluid.

53. The di-electric fluid gets ionizes in between _ gap.

a) tool-electrode
b) cathode-anode
c) workpiece-electrode
d) tool-workpiece

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Answer: a
Explanation: The di-electric fluid gets ionized in between the tool-electrode gap and hence, helps in
creating a path for each discharge. Because of these discharges, material is removed from the workpiece.

54. In wire-cut EDM process, material removal takes place by a series of discrete discharges between

a) di-electric fluid and the wire electrode

b) the wire-electrode and the workpiece
c) the workpiece and the CNC-table
d) wire electrodes

Answer: b
Explanation: In wire-cut EDM process, material removal takes place by a series of discrete discharges
between the wire and the workpiece in the presence of a di-electric fluid. Water is commonly used as the
di-electric fluid.

55. How many subsystems are there in wire-cut EDM process?

a) 2
b) 3
c) 4
d) 5

Answer: c
Explanation: The subsystems of Wire-EDM process are:
• Power supply
• Di-electric system
• Wire feeding system
• Positioning system.

56. In wire-cut EDM, a moving wire is used to

a) remove the burr
b) cut complex outlines

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c) melt the material

d) make the way for the di-electric fluid

Answer: b
Explanation: In wire-cut EDM, a moving wire is used to cut complex outlines and fine details in the
required workpiece. The wire is wound on a spool and is kept in constant tension.

57. Wire electric discharge (ED) machining is based on the same principle as that of
a) hydro-dynamic EDM
b) die-sink EDM
c) polar EDM
d) non-conventional EDM

Answer: b
Explanation: Wire electric discharge (ED) machining is based on the same principle as die-sink ED
machining. The basic elements in all EDM methods are dielectric fluid, a workpiece and an electrode.

58. The only difference between die-sink EDM and wire cut EDM is the
a) way of material removal
b) electrode used for the machining
c) type of materials machined
d) processing time

Answer: b
Explanation: In the die-sink EDM method the electrode has the same shapes as the wished machining
results. In the wire cut EDM method the electrode is a moving wire made from some electrically
conducting material. The workpiece is cut with the electrode wire.

59. Sparking gap is the distance between

a) the workpiece and the CNC table
b) the workpiece and the electrode wire
c) the electrode wire and the di-electric fluid
d) the workpiece and the spark plug

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Answer: b
Explanation: The distance between the electrode wire and the workpiece is called a sparking gap. The
electrode produces shapes that are a sparking gap dimension larger than the programmed shape through
which the electrode wire passes.

60. Which of the following component of the wire cut EDM machine does not get heated?
a) Workpiece
b) Electrode wire
c) Di-electric fluid
d) Coils

Answer: b
Explanation: The electrode wire moves between two coils with a moderate speed. The part of the wire
that actually machines the workpiece is constantly changing. There is no time for the wire to heat up.

61. The electrode wires are usually made form

a) graphite
b) iron
c) nickel
d) brass

Answer: d
Explanation: Wire used in wire cut EDM are usually made of brass – either zinc-coated or uncoated.
Brass wire can be purchased in different hardnesses and different diameters. Zinc coated wire is used in
machining high melting point workpiece materials.

62. For machining of high melting point materials, wires are used.
a) gallium
b) zinc coated
c) aluminium coated
d) silver

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Answer: b
Explanation: Zinc coated wire is used in machining high melting point workpiece materials. The zinc
coating vaporises in lower temperature than the brass core. Vaporisation reduces the amount of heat that
transmits to the brass and the core wears less.

63. Which of the following is not the application of wire cut EDM process?
a) Machining ejector holes
b) Cutting the ejector pins
c) Machining cores of various moulds
d) Machining of complex shapes made of plastic

Answer: d
Explanation: The most typical wire cut EDM applications in mould making are: −
• Machining ejector holes
• Shaping and cutting the ejector pin ends to follow mould cavity surface shapes
• Machining cores and corresponding fastening holes in the mould plates and inserts.

64.The following image is represent process.

a) AFF b)WEDM c)AWJM d) FMAB

Ans:-b

65. Which process combines principle of EDM and ECM processes.

a)STEM b)AFF c)ECDM d)WEDM

Ans:-c

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66. ECDM uses welding copper plates and foils.

a)micro electro seam b)one of two electrode c)current d)Electrolyte concentration

Ans:-a

67. The following figure related with process.

a)rotary EDM b)ECDM c)Ultrasonic assisted EDM d)WEDM

Ans:-c

1 and 2 Marks Questions.

a.What is the purppose of Electrolytic In-process Dressing(ELPD)?

b.States any 4 application of ELPD.

c.What are the element of the Laser system?

d.States the all four types of AFF process.

e. What is FMAB?

f. What is purpose of Rotary EDM?

g.How REDM increase MRR?

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Department: Mechanical Engineering Subject: Advanced Manufacturing Processes

Multiple Choice Questions

Unit 1:Special Forming Processes

1. Which word best describes the roll forming?

a) Die forming b) Coining c) Progressive d) Profiling

Answer: c
Explanation: Roll forming is a continuous process for forming sheet, strip or coiled metal stock into
long shapes of essentially uniform cross-section. The material is fed through pairs of contoured
forming rolls, which progressively shape the metal until the desired cross-section is produced.

2. Which of the following are the most desirable materials used in roll forming?
a) Spring steel b) Chromium-molybdenum steel c) Non-metals d) Mild steels and aluminium

Answer: d
Explanation: Both ferrous and non-ferrous metals as well as some non-metallic material can be roll
formed. Mild steel and aluminium are the most common materials used in the process. Additionally,
polished, painted, coated and plated materials can also be roll formed.

The most common cutting method of roll forming is ____________

a) sawing b) pre-cutting c) parting d) post-cutting

Answer:d
Explanation: The stock to be roll formed may be either pre-cut to a pre-determined length before roll
forming, or post-cut afterward to a specified dimension. But the latter one is the most common. By
incorporating auxiliary equipment such as pre-notching, punching, embossing, etc. the post-cut
method can be a complete net-shape process, fully automated.

9. Which of the following is the most common material used to produce forming rolls?
a) Aluminium b) Carbide c) Chrome steels d) Oil hardened tool steels

Answer:d
Explanation: Several types of materials are used in the manufacture of the forming rolls and oil

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hardened tool steel being the most common. For extended tool life, hardened high-carbon, high-
chromium too steels are used. On extremely tough forming applications involving high temperatures
and or abrasive materials, aluminium/bronze or carbide rolls are required.

10.Which of the following is used for lubrication in heavy-duty roll forming?

a) Extreme pressure-type solutions b) Soap-type solutions
c) Non-ionic type solutions d) Micro-emulsions

Answer: b
Explanation: The soap-type solutions are used for heavy-duty roll forming. Non-ionic type solutions
are excellent for roll forming aluminium and coated components and extreme pressure-type are used
for high strength alloys.

11.The following image is ______ forming processes

a)High Rate Energy b)Roll c) Stretch d)Spin

Ans:-b

12.In HREF high energy is applied for __________ interval of time.

a)Short b) Long c) Medium

Ans:-a

13.HERF is not suitable for __________ Materials.

a)Brittle b)Soft c) Tough d)hollow

Ans:- a

14. In HREF dies need to be much bigger to withstand high energy rates and shocks and to
prevent _________.

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a)Deformation b)Elongation c)Cracking d)Bulk

Ans:-c

15.In ____________ forming TNT, RDX and Dynamite is used.

a)Roll b)Spin c)explosive d)HERF e) c & d both

Ans:-e

16.The following Image related to ___________ forming processes.

a)Roll b)Electro Hydraulic c)explosive d)petro-forge

e)Stretch

Ans:- c)

17. In uncofined type explosive forming the _______ is necessary in the die to prevent
adiabatic heating of the work which may lead to oxidation or melting.
a)water b)air c)vacuum d)explosive
Ans:- c.

18. The characteristics of ____________ forming are similar to those of explosive forming.
a)HERF b) Roll c)High Velocity d)Electro Hydraulic
Ans:-d

19.Like chemical explosive in HERF, Electro hydraulic forming used __________.

a)capacitor Bank b)pressure c)airgap d)current

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Ans:-a

20.The following diagram related with __________ forming process.

a)Roll b)Electro Hydraulic c)explosive d)petro-forge e)Stretch

Ans:-b

21.In electromagnetic forming, coil is firmly held and hence the work piece collapses into the
die cavity due to _______________. thus assuming die shape.
a.air gap b)vacuum c)current d)magnetic repelling force
Ans:-d

22. The following Image related to ___________ forming processes.

a) Hydro forming b)Electro Hydraulic c)explosive d)Electromagnetic e)Stretch

Ans:-d
23.What is (are) the limitation(s) of electromagnetic forming.
a) Applicable only for electrically conducting materials. b) Not suitable for large work pieces.
c) Rigid clamping of primary coil is critical. d)All of these.
Ans:-d

24. ______________ is a process related to conventional spinning and is also known as flow
turning or spin forging.
a)Flow spinning b)Shear Spinning c)Metal Spinning d)roll forming
Ans:-b

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25. The following Image related to ___________ forming processes.

a)shear b)Sheet metal spinning c)Roll d)None of These

Ans:-b

26.Which of the following is Not the type of Bulk forming processes.

a)Wire Drawing b)Bending c)Rolling d)Forging
Ans:-b

27.Which of the following is Not the type of Sheet Metal forming processes.
a)Bending b)Deep Drawing c)Shearing d)Extrusion
Ans:-d
28.Which of the following is Not the type of HREF processes.
a)Electromagnetic Forming b)Explosive forming c)Electro hydraulic d)Forge forming
Ans:- d
29. . The following Image related to ___________ forming processes.

a)Stand-off technique b)Roll forming c) Explosive Forming d)vacuum Forming

Ans:-c
30.Which of these not a type of Magnetic Pulse forming process.
a)Swaging Method b)Reduction Method c)Expanding Method d)Embossing Method
Ans:-b
31.In EHF the energy of shock wave and pressure pulse generated depends on size of ___________.
a)die b)workpiece c)capacitor d)sparking electrode
Ans:-c

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32.The following figure related to ______________ forming process.

a)Tube Hydro b)Sheet Hydro c)vacuum pressure d)High pressure

Ans:-b
33. ___________ forming is Single Tool Technology aas there is no need of the expensive matched of
male /female die sets.
a)Tube Hydro b)Sheet Hydro c) vacuum pressure d)High pressure
Ans:-b
34The following figure related with____________ forming process.

a)Sheet metal Spinning b)Shear Spinning c)Flow d)circular

35.Large plastic deformation while thinning of the blank is involved in _________________ process.
a)Sheet metal Spinning b)Shear Spinning c)Flow d)circular
Ans:- b
36.From which of the following is not the process variable of spinning.
a)Roller Path b)spindle Speed c)Sheet Material d)Feed Ratio
Ans:-c
37. _______________ forming process is also called as Tube Spinning.
a)Sheet metal Spinning b)Shear Spinning c)Flow d)circular
Ans:- c
38.The ______________ process involves applying compression to the outside diameter of cylindrical
perform by combination of axial an radial forces using a set three or four rollers.
a)Sheet metal Spinning b)Shear Spinning c)Flow forming d)Roll forming

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Ans:-c
40.The following figure related to ________________ process.

a)Sheet metal Spinning b) Forward Flow forming c)Backward Flow forming d)Roll forming
Ans:-b.
41.In ____________ proess, it does not required lubrication.
a) Stretch b)roll c)Shear flow d)Incremental Shear
Ans:-a
42.The _____________ process is also known as single point forming.
a) Stretch forming b)roll process forming c)Shear flow process forming
d)Incremental Shear forming Ans:-d
43.The following figure related to_____________ forming process.

a) Stretch b)roll c)Shear flow d)Incremental Shear

Ans:-d
44.________________ process is similar to process that takes place in an internal combustion engine.
a)Petro-forge forming b)Explosive forming c)Hydro forming d)None of these.
Ans:-a
45.___________ process is used to high speed forging, for bar cropping, for hot forging of gears,
metal powder compaction and sheet blanking etc.
a)Petro-forge forming b)Explosive forming c)Hydro forming d)Sheet shearing

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Ans:-a
46.The following figure related to_________ process.

a)Petro-forge forming b)Explosive forming c)Hydro forming d)Sheet shearing

Ans:-a

Short Questions for 1marks and 2 marks .

What are the Characteristics of Electro-hydraulic Forming?
What is Micro conning and micro forming?
What is -Extrusion and Fine blanking?
Explain Principle of Micro Bending/Laser Bending Process.
What is the one main difference in Shear spinning and Metal Sheet Spinning?
States specification of Stretch forming.
What are different parameters of EHF?
What are the different component in Incremental Shear forming?
What are the different variables of spinning process?

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Department: Mechanical Engineering Subject: Advanced Manufacturing Processes

Multiple Choice Questions

Unit 2 Advance Joining Processes

1. Friction welding produces welds due to ______
a) electrode melting
b) workpiece melting
c) relative motion between work pieces
d) adhesive force between workpiece particles

Answer: c
Explanation: Friction Welding (FRW) is a solid state welding process which produces welds
due to the compressive force contact of work pieces which are either rotating or moving relative
to one another.

2. In friction welding, material is deformed due to_____

a) elastic deformation
b) plastic deformation
c) ductile deformation
d) brittle deformation

Answer: b
Explanation: In friction welding the heat required to produce the joint is generated by friction heating at
the interface. This heat displaces material plastically from the faying surfaces.

3. Which of the following is true about friction welding?

a) One workpiece is held stationary while the other is moving
b) Both the workpieces are moving
c) Both the workpieces are stationary and filler is added in the space between them
d) The material is deformed elastically

Answer: a
Explanation: The components to be joined are first prepared to have smooth, square cut surfaces. One
piece is held stationary while the other is mounted in a motor driven chuck or collet and rotated against
it at high speed.

4. During friction welding, initially low pressure is applied. Why?

a) For slowly increasing the surface temperature
b) For melting the surface coating on the materials

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c) To check weldabilty of two materials
d) For initial cleaning of the surface

Answer: d
Explanation: A low contact pressure may be applied initially to permit cleaning of the surfaces
by a burnishing action. This pressure is then increased and contacting friction quickly generates
enough heat to raise the abutting surfaces to the welding temperature.

5. After the welding temperature is reached _____

a) rotation is stopped
b) speed of rotation is increased
c) rotation of first workpiece is stopped and second workpiece starts rotating
d) filler material is added

Answer: a
Explanation: As soon as the welding temperature is reached, rotation is stopped and the pressure is
maintained or increased to complete the weld. The softened material is squeezed out to form a flash. If
desired, the flash can be removed by subsequent machining action.

6. By friction welding, steel bars upto _____ mm diameter can be welded.

a) 10
b) 50
c) 100
d) 210

Answer: c
Explanation: During friction welding, a forged structure is formed in the joint. Friction welding
has been used to join steel bars upto 100 mms in diameter and tubes with outer diameter upto
100 mm.

7. Inertia welding is a modified form of friction welding.

a) True
b) False

Answer: a
Explanation: Inertia welding is a modified form of friction welding, where the moving piece is attached
to a rotating flywheel. The flywheel is brought to a specified rotational speed and is then separated from
the driving motor.

8. Which of the following is not true about inertia welding?

a) Weld is formed when the flywheel stops

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b) The process is difficult for automation
c) Weld quality is consistent
d) Parts remain in contact even after the weld is completed

Answer: b
Explanation: The weld is formed when the flywheel stops its motion and the pieces remain
pressed together. Since the conditions of the inertia welding are easily duplicated, welds of
consistent quality can be produced and the process can be easily automated.

9.Which of the following materials cannot be welded by friction welding?

a) Aluminium
b) Copper
c) Stainless steel
d) Non-forgeable materials

Answer: d
Explanation: Dry bearing and non-forgeable materials cannot be welded by a friction welding
process, i.e., one of the components must be ductile when hot, to permit deformations.
Preparation and alignment of the workpieces of the workpieces may be critical for developing
for developing uniform rubbing and heating, particularly for pieces having diameters larger
than 50mm.

10.Aluminium is difficult to friction weld because of _____

a) ductility
b) softness
c) micro porosity
d) heat reflectivity

Answer: c
Explanation: The basic problems with friction welding of aluminium and its alloys are that they
possess:
• Cast brittle dendritic structure
• Micro porosity
• Loss of strength in heat affected zone

11. Which of the following processes can be used as alternative technique for joining
aluminium and its alloys?
a) Tungsten inert-gas welding
b) Metal inert-gas welding

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c) Friction stir welding
d) Oxy-Acetylene flame technique

Answer: c
Explanation: The following alternate techniques are being used for joining of aluminium and its
alloys:
• Electron beam welding
• Laser beam welding
• Variable polarity plasma arc welding
• Friction stir welding.

12. All metallic engineering materials which are _____ can be friction welded.
a) soft
b) weldable
c) forgeable
d) metamaterials

Answer: c
Explanation: As a rule, all metallic engineering materials which are forgeable can be friction
welded, including automotive valve alloys, maraging steel, tool steel, alloy steels and tantalum.
In addition, many castings, powder metals and metal matrix composites are weldable.

13.Friction welding produces quality joints, with a 100% _____ weld.

a) lap joint
b) tee-joint
c) butt joint
d) edge joint

Answer: c
Explanation: Friction welding produces forged quality joints, with a 100% butt joint weld
through the contact area. Furthermore, in friction welding heat affected zone is much narrower
as compared to other welds, which indeed reduces the cost of post-weld heat treatments (stress
relieving processes).

14._____ generated during friction welding is coherent.

a) Burr
b) Molten metal
c) Flash curl
d) Fly ash

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Answer: c
Explanation: The flash curl generated during welding is coherent, will not flake off, and can
often be left intact if design and engineering considerations allow. Alternately, parts can
frequently be designed to accommodate the flash curl in a recess (flash trap).

15. Which of the following is not the advantage of friction welding?

a) No smoke generation during the process
b) Less sparks are produced during the process
c) Applicable for all metals
d) Time saving process

Answer: c
Explanation: The advantages of this process such as no smoke, fumes or gases, or few sparks
produced, and the fact that the process is machine-controlled, make it suitable for use in
potentially explosive or hazardous environments. The machine can be fully automated so the
operator can be safely located out of harm’s way. This process is not applicable to non-
forgeable metals.

16.From given below which one is not the processes parameter of FSW.

a)Rotation Speed b)Tilting angle c)Material used d)Down force

Ans:- c

17.In FSW small change in shape of tool can cause significance change in ____________ and
quality of weld.

a)Operational Speed b)tool quality c)feed d)removed chips

Ans:- Operational Speed

18._____________ is the period of the starting stage of welding process in FSW.

a)Transient stage b)Dwell c)Pseudo Steady State d)none of these

Ans:-Dwell

19.________ is the constant eat generation starts in the beginning of the process.

a) Transient heat b)Dwell c)Pseudo Steady State d)none of these

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ANS:-a

20._____________- is the stage in which the thermal zone around the tool becomes steady.

a)Transient stage b)Dwell c)Pseudo Steady State d)none of these

Ans:-c

21.In electron beam welding the tungsten filament heated upto high temperature at _______
degree Celsius.

a)2500 b)2200 c)3000 d)1800

Ans:-2500

22..In electron beam welding the ______ filament heated upto high temperature at 2500 degree
Celsius.

a)Titanium b)Carbide tool c)Tungsten d)steel alloy

Ans:-Tungsten

23.From the following image one D shows ___________ zone.

a)Parent Metal b)Heat Affected c)Thermo Mechanical Effected d)Weld Nugget

Ans:-d

24.From the following image one C shows ___________ zone.

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a)Parent Metal b)Heat Affected c)Thermo Mechanical Effected d)Weld Nugget

Ans:-c

25.From the following image one B shows ___________ zone.

a)Parent Metal b)Heat Affected c)Thermo Mechanical Effected d)Weld Nugget

Ans:-b

26.From the following image one A shows ___________ zone.

a)Parent Metal b)Heat Affected c)Thermo Mechanical Effected d)Weld Nugget

Ans:-a

27.In electronic beam welding depth of penetration is depending upon ________.

a)Electronic beam power b)acceleration voltage c)beam current d)None of these.

Ans:-b

28.In Laser Beam Welding ______________- used to emit light.

a)cadmium lamp b)florescent lamp c)Flash lamp d)None of these

Ans:-c

29.Laser beam welding is a ______ joining process.

a) fission b) fusion c) coherent d) plastic

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Answer: b
Explanation: Laser is an acronym for light amplification by stimulated emission of radiation.
Laser Beam Welding (LBW) is a fusion joining process that produces coalescence of materials
with the heat obtained from a concentrated beam of coherent, monochromatic light impinging
on the joint to be welded.

30.Which of the following is used to direct laser beam?

a) glass apertures b) perforated glass sheets c) flat optical elements
d) electro-magnetic coils

Answer: c
Explanation: In the LBM process, the laser beam is directed by flat optical elements, such as
mirrors and then focused to a small spot (for high power density) at the workpiece using either
reflective focusing elements or lenses.

31.In case of laser welding, heat input is _____ to fuse the weld metal.
a) equal to the required amount b) close to the minimum required
c) greater by 200 J than required d) approximately higher by atleast 320 J

Answer: b
Explanation: Following are the few advantages of Laser Beam Welding:
• Heat input is close to the minimum required to fuse the weld metal
• Reduced heat affected zones
• Workpiece distortions are minimized due to smaller heat affected zones.

32..In LBW the atoms of ____________ absorb the energy and electron of those atoms get
excited.

a)Ruby crystal b)Quarts Crystal c)Swiss quartz crystal d) diamond crystal

Ans:-a

33. Tool in USM is generally made from which of the following materials?
a) Glass b) Ceramic c) Carbides d) Steel

Ans:-d

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Explanation: The tool material should be such that indentation by the abrasive grits does not
lead to brittle failure. Thus the tools are made of tough, strong and ductile materials like steel,
stainless steel and other ductile metallic alloys.

34. In ultrasonic machining, the abrasive particles act as the __________

a) chip carriers b) intenders c) finishing particles

d) thickening agent for the slurry

Answer: b
Explanation: During ultrasonic machining, as the tool vibrates over the workpiece, the abrasive
particles act as the indenters and indent both the work material and the tool.

35. During USM, cracks are produced due to _____

a) von-mises stresses b) hertzian stresses c) principal stresses
d) episodic acute stresses

Answer: b
Explanation: During USM, as the tool vibrates, it leads to the indentation of the abrasive grits.
During indentation, due to hertzian contact stresses, cracks would develop just below the
contact site then as indentation progresses the cracks would propagate due to increase in stress
and ultimately lead to brittle fracture of the work material under each individual interaction site
between the abrasive grits and the workpiece.

36. Increasing volume concentration of abrasive in slurry would affect MRR in which of the
following manner?
a) increase MRR
b) decrease MRR
c) would not change MRR
d) initially decrease and then increase MRR

Answer: a
Explanation: The concentration of abrasive grits in the slurry is related as follow
n = (6AC)/ πdg2,
where n= number of grits
A= total surface area of the tool facing the workpiece
C= concentration of abrasive grits in the slurry
dg= diameter of a grit
Thus above relation shows that any increase in ‘C’ will increase ‘n’ and hence material removal
rate (MRR).

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37. Which of the following material is not machined by USM?
a) Brittle metals b) Glass c) Ceramics d) Ductile materials

Answer: d
Explanation: USM is used for machining;
• hard metallic alloys • brittle metallic alloys • semiconductors • glass • ceramics
• carbides.

38. The development of USM was started in _____

a) 1920 b) 1927 c) 1947 d) 1980

Ans:-b

Explanation: The development of USM was started in 1927. It was accidentally discovered
during investigating the ultrasonic grinding of abrasive powders.

39. Which of the following is not a part of the ultrasonic machine used in USM?
a) Generator b) Acoustic head c) Slurry pump d) Lead-screw

Answer: d
Explanation: The basic ultrasonic equipment consists of, a generator for high frequency
oscillations; an acoustic head, consisting of a transducer and a horn also known as shank or
trunk; also, tool and abrasive slurry elements like pump and tank for slurry.

40. The tool is joined to the trunk by _____

a) riveted joint b) welded joint c) brazing d) honing

Answer: c
Explanation: The tool is attached to the trunk or the horn by silver brazing process. At times it
is fasten or the screwed to the trunk also. The commonly used tool materials are brass, high
speed steel, mild steel, silver, stainless steel, tungsten carbide and monel metal.

41.Which of these are(is) Not the thermal spray coating processes?

a)Wire frame spray b)Electric arc wire spray c)Plasma Spray

d)carbide coat Spray

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Ans:-d

42.The following figure shows the _________________ process.

a)Wire frame spray b)Electric arc wire spray c)Plasma Spray

d)High velocity oxy fuel Spray

Ans:-a)

43.In plasma spray coating the temperature of plasma is as much as ________degree Celsius

a)12000 b)14000 c)10000 d)16000

Ans:-16000

44.The __________ process utilizes a combination of oxygen with various fuel gases hydrogen,
propane, propylene.

a)Plasma Spray b)Electric arc wire spray c)Plasma Spray

d)High velocity oxy fuel Spray

Ans:-d

45.The following diagram shows______________ Process.

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a)Ultrasonic welding b)Electric arc wire spray c)Plasma Spray

d)High velocity oxy fuel Spray

Ans:-a

46.Material like Pentaerytritol Tetranitrate and Trinitrotoluene is used in __________

a)Electric Welding b)High Velocity oxy fuel spray c) Explosive welding

d)None of these

Ans:-c

47.In cryogenic welding the cryogenic phenomenon includes the material processing under
_______ degree Celsius temperature.

a)-500 b)-50 c)-150 d)-300

Ans:- c

Descriptive Question for 1 and 2 Mark .

What are the different parameters of FSW.?

What are the metallurgical Advantages of FSW?

What are safety precaution in Underwater welding?

What are the applications of Thermal Spray coating?

Which area ultrasonic welding is applicable?

What are the applications of Laser Beam Welding?

Which are the tool materials applicable in FWS?

What is principle of Electronic Beam Welding?

State different welding zones.

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What are the methods available for welding polymer?

Which gases are uses in cryogenic application?

What are the temperatures of the gases used in cryogenic applications?

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 Unit 3 - AMP
1. Mechanism of material removal in Laser Beam Machining is due to _____
a) mechanical erosion due to impact of high of energy photons
b) electro-chemical etching
c) melting and vaporisation due to thermal effect of impingement of high energy laser beam
d) fatigue failure
View Answer
Answer: c
Explanation: Laser beam machining is carried out utilizing the energy of coherent photons or
laser beam, which is mostly converted into thermal energy upon interaction with most of the
materials.
2. Laser Beam is produced due to _____
a) spontaneous emission
b) stimulated emission followed by spontaneous emission
c) spontaneous emission followed by Spontaneous absorption
d) spontaneous absorption leading to “population inversion” and followed by stimulated
emission
View Answer

Answer: d
Explanation: Lasing process describes the basic operation of laser, i.e. generation of a coherent
(both temporal and spatial) beam of light by “light amplification” using “stimulated emission”.
3. Which of the following processes does not use lasers?
a) Cladding
b) Alloying
c) Nitriding
d) Cutting
View Answer
Answer: c
Explanation: Laser Beam Machining or more broadly laser material processing deals with
machining and material processing like heat treatment, alloying, cladding, sheet metal bending,
etc.
4. Lasers are also used for_____
a) riveting
b) nitriding
c) rapid prototyping
d) facing
View Answer

Answer: c
Explanation: Nowadays, laser is also finding application in regenerative machining or rapid
prototyping as in processes like stereo-lithography, selective laser sintering etc.
5. Laser stands for light amplification by stimulated emission of radiation.
a) True
b) False
View Answer

Answer: a
Explanation: Laser stands for light amplification by stimulated emission of radiation. The
underline working principle of a laser was first put forward by Albert Einstein in 1917 through
the first industrial laser for experimentation was developed around the 1960s.
6. Laser beams can have power density upto _____
a) 1 kW/mm2
b) 10 kW/mm2
c) 1 MW/mm2
d) 10 MW/mm2
View Answer
Answer: c
Explanation: Laser beam can very easily be focused using optical lenses as their wavelength
ranges from half micron to around 70 microns. Focussed laser beam as indicated earlier can have
power density in excess of 1 MW/mm2.

7. Laser causes a rapid substantial rise in _____ of the material.

a) local temperature
b) local pressure
c) indentation
d) cracks
View Answer
Answer: a
Explanation: As laser interacts with the material, the energy of the photon is absorbed by the
work material leading to rapid substantial rise in local temperature. This in turn results in melting
and vaporisation of the work material and finally material removal.
8. At _____ temperature an atom is considered to be at ground level.
a) absolute zero
b) 0oC
c) 100oC
d) 100 K
View Answer

Answer: a
Explanation: Each of the orbital electrons is associated with unique energy levels. At absolute
zero temperature an atom is considered to be at ground level when all the electrons occupy their
respective lowest potential energy.
9. The electrons at ground state can be excited to a higher state of energy by _____
a) increasing the pressure
b) lowering the energy
c) absorbing the energy
d) oxidising the atom
View Answer
Answer: c
Explanation: The electrons at ground state can be excited to higher state of energy by absorbing
energy form external sources like increase in electronic vibration at elevated temperature,
through chemical reaction as well as via absorbing the energy of the photon.
10. The geometry and radii of orbital paths of electrons depend on the presence of an
electromagnetic field.
a) True
b) False
View Answer
Answer: a
Explanation: In the model of an atom, negatively charged electrons rotate around the positively
charged nucleus in some specified orbital paths. The geometry and radii of such orbital paths
depend on a variety of parameters like number of electrons, presence of neighbouring atoms and
their electron structure, presence of an electromagnetic field, etc.

11. When coming back to normal state from excited state, electron releases _____
a) proton
b) anti-proton
c) positron
d) photon
View Answer
Answer: d
Explanation: On reaching the higher energy level, the electron reaches an unstable energy band.
And it comes back to its ground state within a very small time by releasing a photon. This is
called spontaneous emission.
12. In population inversion, no of electrons in _____ are more as compared to numbers of
electrons in _____
a) quasi-stable state, ground state
b) meta-stable state, ground state
c) meta-stable state, quasi-stable state
d) mono-stable state, ground state
View Answer
Answer: b
Explanation: Sometimes such change of energy state puts the electrons in a meta-stable energy
band. Instead of coming back to its ground state immediately (within tens of ns) it stays at the
elevated energy state for micro to milliseconds. In a material, if more number of electrons can be
somehow pumped to the higher meta-stable energy state as compared to the number of atoms at
ground state, then it is called “population inversion”.
13. In laser beam machine, one end of the glass is_____
a) open
b) blocked with a 10% reflective mirror
c) blocked with a 75% reflective mirror
d) blocked with a 100% reflective mirror
View Answer

Answer: d
Explanation: The gas, called lasing medium is enclosed in a cylindrical glass vessel. One end of
the glass is blocked with a 100% reflective mirror and the other end is having a partially
reflective mirror.
14. In laser beam machining, electrons are excited by _____
a) high temperature steam
b) flash lamps
c) flash torch
d) cathode ray tube
View Answer
Answer: b
Explanation: Population inversion can be carried out by exciting the gas atoms or molecules by
pumping it with flash lamps. Then stimulated emission would initiate lasing action. Stimulated
emission of photons could be in all directions.

15. The photons emitted in the _____ direction form a laser beam.
a) vertical
b) horizontal
c) longitudinal
d) lateral
View Answer
Answer: c
Explanation: Most of the stimulated photons, not along the longitudinal direction would be lost
and generate waste heat. The photons in the longitudinal direction would form coherent, highly
directional, intense laser beam.
16. How many types of lasers are there?
a) 2
b) 3
c) 4
d) 5
View Answer
Answer: a
Explanation: Many materials can be used as the heart of the laser. Depending on the lasing
medium lasers are classified as:
• Solid-state laser
• Gas laser.
17. How many types of solid state lasers are there?
a) 2
b) 3
c) 4
d) 5
View Answer

Answer: b
Explanation: Solid-state lasers are commonly of the following type:
• Ruby which is a chromium – alumina alloy having a wavelength of 0.7 μm
• Nd-glass lasers having a wavelength of 1.64 μm
• Nd-YAG laser having a wavelength of 1.06 μm
These solid-state lasers are generally used in material processing.
18. Lasers can be operated in _____ modes
a) 2
b) 7
c) 8
d) only one
View Answer
Answer: a
Explanation: Lasers can be operated in
• continuous mode, or
• pulsed mode
Typically CO2 gas laser is operated in continuous mode and Nd – YAG laser is operated in
pulsed mode.

19. Helium-Neon is a gas laser.

a) True
b) False
View Answer
Answer: a
Explanation: The generally used gas lasers are:
• Helium – Neon
• Argon
• CO2 etc.
20. Flash tubes used for Nd-YAG laser can be helical or flat.
a) True
b) False
View Answer
Answer: a
Explanation: Nd-YAG laser is pumped using a flash tube. Flash tubes can be helical, or they can
be flat. Typically the lasing material is at the focal plane of the flash tube. Though helical flash
tubes provide better pumping, they are difficult to maintain.
21. The flash tube is operated in _____ mode.
a) pulsed
b) continuous
c) reversed
d) synchronous
View Answer
Answer: a
Explanation: The flash tube is operated in pulsed mode by charging and discharging of the
capacitor. Thus the pulse on time is decided by the resistance on the flash tube side and pulse off
time is decided by the charging resistance. There is also a high voltage switching supply for
initiation of pulses.
22. How many types of flows are possible in gas lasers?
a) 2
b) 3
c) 4
d) 5
View Answer

Answer: b
Explanation: Gas lasers can be:
• Axial flow
• Transverse flow
• Folded flow.
23. The power of CO2 laser is around______
a) 15 Watt per meter of tube length
b) 55 Watt per meter of tube length
c) 100 Watt per meter of tube length
d) 1 MW per meter of tube length
View Answer
Answer: c
Explanation: The power of a CO2 laser is typically around 100 Watt per metre of tube length.
Thus to make a high power laser, a rather long tube is required which is quite inconvenient. For
optimal use of floor space, high-powered CO2 lasers are made of folded design.
24. In a CO2 laser, a mixture of _____ is circulated through the gas tube.
a) CO2, N2 and He
b) CO2, N2 and Ar
c) CO2, H2 and N2
d) CO2, I2 and O2
View Answer
Answer: a
Explanation: In a CO2 laser, a mixture of CO2, N2 and He continuously circulate through the gas
tube. Such continuous recirculation of gas is done to minimize consumption of gases.
25. In CO2 laser, ‘He’ gas is used for cooling purpose.
a) True
b) False
View Answer
Answer: a
Explanation: CO2 acts as the main lasing medium whereas nitrogen helps in sustaining the gas
plasma. Helium on the other hand helps in cooling the gases. High voltage is applied at the two
ends of the tube leading to discharge and formation of gas plasma.
26. CO2 lasers are folded to achieve _____________
a) high power
b) high depth of cuts
c) high material removal rate
d) avoid over heating
View Answer
Answer: a
Explanation: CO2 lasers are folded to achieve high power. In folded laser, there would be a few
100% reflective turning mirrors for manoeuvring the laser beam from the gas supply as well as a
high voltage supply.
27. Nd-YAG laser can be used for drilling holes in the range of _____ diameter.
a) 0.25 mm – 1.5 mm
b) 1 mm – 1.5 mm
c) 1.5 mm – 2 mm
d) 2 mm – 2.5 mm
View Answer
Answer: a
Explanation: For drilling holes as small as 0.25mm and as large as 1.5mm diameter, following
lasers are used;
• Nd-YAG,
• Nd-glass, and
• Ruby.
28. For which of the following materials CO2 laser is not used?
a) Plastics
b) Metals
c) Organic materials
d) Ceramics
View Answer

Answer: b
Explanation: For,
• Plastics— CO2 laser is used
• Metals—Nd-YAG, Ruby, Nd-glass lasers are used
• Organic materials and non-metals—Pulsed CO2 laser is used
• Ceramics—Pulsed CO2, Nd-YAG lasers are used.

29. Which of the following does not hold true about laser beam machining?
a) High initial cost
b) High running cost
c) No heat affected zone
d) It is not suitable for heat sensitive materials
View Answer
Answer: c
Explanation: Following are the limitations of laser beam machining;
• High initial capital cost
• High maintenance cost
• Not very efficient process
• Presence of Heat Affected Zone – specially in gas assist CO2 laser cutting
• Thermal process – not suitable for heat sensitive materials like aluminium glass fibre laminate.
30. Using lasers, large aspect ratio in drilling can be achieved.
a) True
b) False
View Answer
Answer: a
Explanation: Following are the advantages of laser beam machining:
• In laser machining, there is no physical tool. Thus no machining force or wear of the tool takes
place.
• Large aspect ratio in laser drilling can be achieved along with acceptable accuracy or
dimension, form or location
• Micro-holes can be drilled in difficult – to – machine materials
• Though laser processing is a thermal processing but heat affected zone especially in pulse laser
processing is not very significant due to the shorter pulse duration.

31. Which of the following is un-conventional machining process?

a) Grinding
b) Milling
c) Turning
d) Electro chemical machining
View Answer
Answer: d
Explanation: Electro chemical machining is an un-conventional machining process used for large
material removal from the surface using electricity generated due to chemical reactions.
32. Which of the following is conventional machining process?
a) Electro chemical machining
b) Milling
c) Electron discharge machining
d) None of the mentioned
View Answer

Answer: b
Explanation: Milling is a conventional machining process used for material removal from the
surface.
33. In ECM, heavy electrical sparks are created.
a) True
b) False
View Answer
Answer: b
Explanation: Sparks are generated in EDM, by using high voltage current, for proper erosion of
material.

34. In ECM, tool does not touch the work piece.

a) True
b) False
View Answer
Answer: a
Explanation: Tool is very near to work piece but does not touch it in ECM.
35. Which of the following is correct about ECM?
a) Erosion of metal takes place as a reverse process of electroplating
b) Thermal stresses are induced
c) Mechanical stresses are induced
d) None of the mentioned
View Answer
Answer: a
Explanation: In ECM, erosion of metal takes place as reverse process of electroplating.
36. Which of the following material cannot be machined using electro chemical machining?
a) Iron
b) Aluminum
c) Copper
d) Wood
View Answer
Answer: d
Explanation: Wood is a bad conductor of electricity and hence cannot be machined using electro
chemical machining.
37. Which of the following material can be machined using electro chemical machining?
a) Iron
b) Rubber
c) Plastic
d) Wood
View Answer

Answer: a
Explanation: Iron is a good conductor of electricity and hence can be machined using electro
chemical machining.
38. Electrode gap in electro chemical machining is generally ranged from
a) 0.5 mm to 0.9 mm
b) 1.1 mm to 1.2 mm
c) 0.1 mm to 0.2 mm
d) 3.1 mm to 4.2 mm
View Answer
Answer: c
Explanation: Electrode gap in electro chemical machining is generally ranged from 0.1 mm to
0.2 mm.

39. Electrolytes used in ECM must posses

a) Low electrical conductivity
b) Low chemical stability
c) High electrical conductivity
d) None of the mentioned
View Answer
Answer: c
Explanation: Electrolytes used in ECM must have high electrical conductivity.
40. Which of the following is not a function of electrolyte in ECM?
a) It completes the circuit
b) It helps in electrochemical reaction
c) It carries away heat and waste product
d) It provide non reactive environment
View Answer

Answer: d
Explanation: Electrolyte provides reactive environment for chemical reactions to takes place.
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Department: Mechanical Engineering Subject: Advanced Manufacturing Processes

Multiple Choice Questions

Unit 3: Hybrid Non-conventional Machining Techniques

1.Which of the following non-conventional machining technologies.

a)Chemical Machining b)Thermal Machining c)Electrochemical Machining d)All of

these Ans:-d

2. STEM process is used in aerospace industries to drill the holes with high length to diameter ratio up to
___________.

a)200:1 b)100:1 c)150:1 d)300:1

Ans:- d

3.Generally in STEM process acid based electrolyte such as sulphuric acid having ____ % concentration
in water.

a)50 b)20 c)10 d)5

Ans:-c

4.In STEM process how much low voltage applied across the gap as higher voltage causes boiling of
electrolyte which eventually damages the electrode coating.

a)5-15 V DC b)10-20 V DC c)1-5 v DC d)20-35 v DC

Ans:-a)

5.The following diagram is related with __________ process.

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a)ECG b)STEM c)EDMd)EJM

6)Using STEM process Small holes _________ in diameter with high length to diameter ratio.

a)0.76-1.62 mm b)1.2 - 2.4mm c)0.05 - 0.225mm d)0.95-3.32 mm

Ans:-a

7.Which material is used as a tool for STEM to resist acid attack by electrolyte.

a)Tungsten b)Aluminium c)Copper d)Titanium

Ans:-d

8.What is the machining current used in STEM process.?

a)200 AMP b)300 AMP c)500 AMP d)600AMP

Ans:-d

9.During the STEM process the tool feed rate is around _______ mm/min.

a)0.75-3 b)2-5.5 c)4-8 d)0.15-0.75

Ans:-a

10.Amongs all these which of the material is not used commonly as bonding material in Electrochemical
Grinding.

a)Copper b)Cobalt c)Brass d) Nickel

Ans:-b

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11.A constant inter-electrode gap _________ is maintained considering the grain size of the abrasive
particle.

a)0.025mm b)0.5mm c)1mm d)1-1.5mm

Ans:-a)

12.The following image related to ___________ process.

a)ECG b)STEM c)EJM d)Rotory EDM

Ans:-a

13.In Electrochemical Grinding the work piece act as anode.

a)True b)False c)not used in ECG

Ans:-a

14.In ECG the size of abrasive particle around _________ grit number.

a)120-800 b)60-320 c)500-1200 d)100-1600

Ans:-b

15.The surface speed of the wheel during the operation is up to______ m/s.

a)5-10 b)10-15 c)20-35 d)85-110

Ans:-c

16.The depth of cut of the ECG process should be less than ____________mm.

a)1 b)2 c)1.5 d)2.5

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Ans:-d.

17.The electrolyte used in the ECG are sodium chloride(NaCL) and Sodium Nitrate(NaNO3).

a)True b)False

18. .The surface speed of the grinding wheel during the operation is up to______ m/s.

a)100-200 b)300-500 c)1200-1800 d)2400-3600

Ans:-c

19.___________ has significant effect on surface finish and material removal rate.

a)Current density b)Air gap c)Flow of electrolyte d)Feed

Ans:-a

20.The surface finish obtained in ECG is ____ µm.

a)0.01-0.05 b)0.1-0.5 c)0.12-0.8 d)0.8-1.2

Ans:-c

21.The ELPD dresses ______ of grinding wheels using the princople of electrolysis.

a)shape b)workpiece c)metal bond d) None of these

Ans:-c

22.The diagram below related to which process?

a)ELPD b)ECG c)EDM d)ECDM

Ans:-a

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23.The wheel loading and glazing can be eliminated by introducing electrolize cell.

a)True b)Flase Ans:-a

24.Whic hof th following is not the component of the ELPD.

a)Power Supply b)Abrasive Particle c)Electrolyte d)Electrode

Ans:-b

25.Electrode must be_____________ in size of the of the grinding wheel perimeter.

a)1/4 to 1/2 b)1/6th to 1/4 c)1/8 to 1/2 d)1/16 to 1/8

Ans:-b

26. In ECG, grinding action removes ____________

a) workpiece material from the surface
b) corroded surface layer making workpiece ready for electro-chemical process
c) oxide film formed on the surface
d) particles removed from surface after chemical action

Answer: c
Explanation: ECG removes metal by combination of electro-chemical and grinding actions. The grinding
action removes the buildup of oxide film on the surface of the workpiece.

27. Electrolyte in ECG should provide _____________

a) lower chemical activity
b) allowance to stray currents
c) high stock removal efficiency
d) higher corrosion tendency

Answer: c
Explanation: Desirable electrolyte should provide: high conductivity, high stock removal efficiency,
passivation to limit stray currents, good surface finishes and corrosion inhibition.

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28. Which of the following is true about ECG?
a) Lower MRRs when grinding hard, heat sensitive materials
b) Machining of soft metals like aluminium can be easily done
c) Difficult to machine materials with high hardness like tungsten carbide
d) Burr-free sharpening of needles

Answer: d
Explanation: Applications of ECG are as follows;
(1) Single largest use for ECG is in the manufacturing and remanufacturing of turbine blades and vanes
for aircraft turbine engines
(2) Grinding of tungsten carbide tool inserts
(3) Re-profiling worn locomotive traction motor gears
(4) Burr-free sharpening of hypodermic needles
(5) Grinding of surgical needles, other thin wall tubes, and fragile parts
(6) Machining of fragile or very hard and tough material – honey comb, thin walled tubes and skins
(7) High MRR’s when grinding hard, tough, stringy, work-hardenable or heat sensitive materials.

29.MRR is ECM depends on _____________

a) hardness of work material
b) atomic weight of work material
c) thermal conductivity of work material
d) ductility of work material

nswer: b
Explanation: In ECM, material removal takes place due to an atomic dissolution of work material.
Electrochemical dissolution is governed by Faraday’s laws. Also, for ECM, MRR= IA/(Fρv), where I=
current, ρ= density of the material, A= atomic weight, v= valency, F= faraday’s constant.

30. Electrolyte used in ECM should have _____________

a) high specific heat
b) lower resistance to film formation on the workpiece

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c) higher viscosity
d) corrosive nature

Answer: a
Explanation: Desirable properties of the electrolytes are as follows:
• High electrical conductivity – for easy ionization
• Low viscosity – for easy flow
• High specific heat – to carry more heat
• Chemical stability – to be chemically neutral or
does not disintegrate during the reaction

31.In which Process electrolytic aqueous solution uses 10 to 25%.

a)EJM b)EDM c) ELPD d)ECG

Ans:-a

32.In EJM a higher voltage of ________V is applied get longer and thinner flow of electrolyte .

a)50-100 b)150-750 c) 200-400 d)600-1000

Ans:-b

33. Laser Beam is produced due to _____

a) spontaneous emission
b) stimulated emission followed by spontaneous emission
c) spontaneous emission followed by Spontaneous absorption
d) spontaneous absorption leading to “population inversion” and followed by stimulated emission

Answer: d
Explanation: Lasing process describes the basic operation of laser, i.e. generation of a coherent (both
temporal and spatial) beam of light by “light amplification” using “stimulated emission”.

34. Which of the following processes does not use lasers?

a) Cladding

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b) Alloying
c) Nitriding
d) Cutting

Answer: c
Explanation: Laser Beam Machining or more broadly laser material processing deals with machining and
material processing like heat treatment, alloying, cladding, sheet metal bending, etc.

35. Laser causes a rapid substantial rise in _____ of the material.

a) local temperature
b) local pressure
c) indentation
d) cracks

Answer: a
Explanation: As laser interacts with the material, the energy of the photon is absorbed by the work
material leading to rapid substantial rise in local temperature. This in turn results in melting and
vaporisation of the work material and finally material removal.

36. In laser beam machining, electrons are excited by _____

a) high temperature steam
b) flash lamps
c) flash torch
d) cathode ray tube

Answer: b
Explanation: Population inversion can be carried out by exciting the gas atoms or molecules by pumping
it with flash lamps. Then stimulated emission would initiate lasing action. Stimulated emission of
photons could be in all directions.

37.The depth of the surface modification depends on the heat input and the depth in the range of
_________ is hardened using laser based heat treatment.

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a)0.025-0.01 b)0.25-2.5mm c)1.5-4.0 mm d)None of these

Ans:-b

38.In Abrasive flow finishing the viscoelastic medium is consisting of ______________.

a) SiC, b) Al2O3 c) Boron Carbide d)all of These

Ans:-d

39.In magnetic abrasive finishing, ________ particles mixed with the fine abrasive particles.

a)ferromagnetic b)SiC c)Al2O3 d)Silicate.

Ans:-a

40.The following figure is related with ___________ process.

a)AFF b)Magnetic Abrasive Finishing c)EDMd)WEDM

41.FMAB stands for __________________

(This question does not cotain option)

42.In which process mechanical energy of water use and abrasive phase is use to achieve material
removal or machining.

a)AFF b)ECG c)AWJM d) FMAB

Ans:-c

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43.The following figure is shows the setup of _____________ process.

a)AFF b)AWJM c)EDM d)WEDM

Ans:-b

44.In Abrasive Water Jet Machining process, the water in converted into Kinetic energy, yielding a high
velocity jet of ___________m/s.

a)100 b)200 c)500 d)1000

Ans:-d

45.In AWJM hydraulic intensifier increases water pressure of ___bar to about 3000-4000 bars.

a)4 b)10 c)16 d)24

Ans:-a

46. Wire-cut EDM can cut plates of thickness upto _____

a) 50mm
b) 100mm
c) 300mm
d) 500mm

Answer: c
Explanation: Wire-cut EDM process can cut plates as thick as 300mm and is used for making punches,
tools and dies from hard metals that are difficult to machine with other methods.

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47. In WEDM, the wire is held tight between_____
a) upper and lower nozzles
b) upper and lower diamond guides
c) upper and lower groves in the handle
d) upper and lower pulleys

Answer: b
Explanation: In wire-cut EDM (WEDM), the wire which is constantly fed from a spool, is held between
upper and lower diamond guides. The guides are usually CNC-controlled and move in the x–y plane.

48. In the wire-cut EDM process, de-ionizing units are used for controlling the _____
a) feed rate
b) resistivity
c) burr formation
d) temperature of the wire

Answer: b
Explanation: In the wire-cut EDM process, water is commonly used as the dielectric fluid. Filters and de-
ionizing units are used for controlling the resistivity and other electrical properties.

49. The WEDM process requires _____

a) lower initial investment
b) lesser cutting forces
c) a skilled operator
d) a coolant pump

Answer: b
Explanation: The wire-cut EDM process requires lesser cutting forces in material removal; hence it is
generally used when lower residual stresses in the workpiece are desired.

50. During the WEDM process, workpiece undergoes a number of thermal cycles.
a) True
b) False

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Answer: a
Explanation: In WEDM process, the selection of process parameters is very crucial, as in some cases the
workpiece undergoes significant thermal cycles the can be very severe. These thermal cycles can form
recast layers and induce residual tensile stresses on the workpiece.

51. Electrically conductive materials are cut by WEDM process by _____ mechanism.
a) thermal
b) electro-thermal
c) electro-dynamic
d) fused metal

Answer: b
Explanation: Electrically conductive materials are cut by WEDM process by an electro-thermal
mechanism. In the WEDM process, the motion of the wire is slow. It is fed in the programmed path and
material is removed from the workpiece accordingly.

52. The burr or cut particles are flushed away by the______

a) electrode
b) motion of the workpiece
c) di-electric fluid
d) coolant

nswer: c
Explanation: The area wherein discharge takes place gets heated to very high temperatures such that the
surface gets melted and removed. The cut particles (debris) get flushed away by the continuously flowing
dielectric fluid.

53. The di-electric fluid gets ionizes in between _____ gap.

a) tool-electrode
b) cathode-anode
c) workpiece-electrode
d) tool-workpiece

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Answer: a
Explanation: The di-electric fluid gets ionized in between the tool-electrode gap and hence, helps in
creating a path for each discharge. Because of these discharges, material is removed from the workpiece.

54. In wire-cut EDM process, material removal takes place by a series of discrete discharges between
_____
a) di-electric fluid and the wire electrode
b) the wire-electrode and the workpiece
c) the workpiece and the CNC-table
d) wire electrodes

Answer: b
Explanation: In wire-cut EDM process, material removal takes place by a series of discrete discharges
between the wire and the workpiece in the presence of a di-electric fluid. Water is commonly used as the
di-electric fluid.

55. How many subsystems are there in wire-cut EDM process?

a) 2
b) 3
c) 4
d) 5

Answer: c
Explanation: The subsystems of Wire-EDM process are:
• Power supply
• Di-electric system
• Wire feeding system
• Positioning system.

56. In wire-cut EDM, a moving wire is used to _____

a) remove the burr
b) cut complex outlines

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c) melt the material
d) make the way for the di-electric fluid

Answer: b
Explanation: In wire-cut EDM, a moving wire is used to cut complex outlines and fine details in the
required workpiece. The wire is wound on a spool and is kept in constant tension.

57. Wire electric discharge (ED) machining is based on the same principle as that of _____
a) hydro-dynamic EDM
b) die-sink EDM
c) polar EDM
d) non-conventional EDM

Answer: b
Explanation: Wire electric discharge (ED) machining is based on the same principle as die-sink ED
machining. The basic elements in all EDM methods are dielectric fluid, a workpiece and an electrode.

58. The only difference between die-sink EDM and wire cut EDM is the _____
a) way of material removal
b) electrode used for the machining
c) type of materials machined
d) processing time

Answer: b
Explanation: In the die-sink EDM method the electrode has the same shapes as the wished machining
results. In the wire cut EDM method the electrode is a moving wire made from some electrically
conducting material. The workpiece is cut with the electrode wire.

59. Sparking gap is the distance between _____

a) the workpiece and the CNC table
b) the workpiece and the electrode wire
c) the electrode wire and the di-electric fluid
d) the workpiece and the spark plug

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Answer: b
Explanation: The distance between the electrode wire and the workpiece is called a sparking gap. The
electrode produces shapes that are a sparking gap dimension larger than the programmed shape through
which the electrode wire passes.

60. Which of the following component of the wire cut EDM machine does not get heated?
a) Workpiece
b) Electrode wire
c) Di-electric fluid
d) Coils

Answer: b
Explanation: The electrode wire moves between two coils with a moderate speed. The part of the wire
that actually machines the workpiece is constantly changing. There is no time for the wire to heat up.

61. The electrode wires are usually made form _____

a) graphite
b) iron
c) nickel
d) brass

Answer: d
Explanation: Wire used in wire cut EDM are usually made of brass – either zinc-coated or uncoated.
Brass wire can be purchased in different hardnesses and different diameters. Zinc coated wire is used in
machining high melting point workpiece materials.

62. For machining of high melting point materials, _____ wires are used.
a) gallium
b) zinc coated
c) aluminium coated
d) silver

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Answer: b
Explanation: Zinc coated wire is used in machining high melting point workpiece materials. The zinc
coating vaporises in lower temperature than the brass core. Vaporisation reduces the amount of heat that
transmits to the brass and the core wears less.

63. Which of the following is not the application of wire cut EDM process?
a) Machining ejector holes
b) Cutting the ejector pins
c) Machining cores of various moulds
d) Machining of complex shapes made of plastic

Answer: d
Explanation: The most typical wire cut EDM applications in mould making are: −
• Machining ejector holes
• Shaping and cutting the ejector pin ends to follow mould cavity surface shapes
• Machining cores and corresponding fastening holes in the mould plates and inserts.

64.The following image is represent ____________ process.

a)AFF b)WEDM c)AWJM d) FMAB

Ans:-b

65.Which process combines principle of EDM and ECM processes.

a)STEM b)AFF c)ECDM d)WEDM

Ans:-c

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66.ECDM uses _________ welding copper plates and foils.

a)micro electro seam b)one of two electrode c)current d)Electrolyte concentration

Ans:-a

67.The following figure related with___________ process.

a)rotary EDM b)ECDM c)Ultrasonic assisted EDM d)WEDM

Ans:-c

1 and 2 Marks Questions.

a.What is the purppose of Electrolytic In-process Dressing(ELPD)?

b.States any 4 application of ELPD.

c.What are the element of the Laser system?

d.States the all four types of AFF process.

e. What is FMAB?

f. What is purpose of Rotary EDM?

g.How REDM increase MRR?

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Department: Mechanical Engineering Subject: Advanced Manufacturing Processes

Multiple Choice Questions

Unit 4:- Micro Machining and Nano Fabrication Technique

1.Diamond turning can achieve tolerance up to ________ .

a)1µm

b)0.1 µm

c)0.01 µm

d)0.001 µm

Ans:-c

2..Diamond turning can achieve surface roughness up to ________ .

a)1µm

b)0.1 µm

c)0.01 µm

d)0.001 µm

Ans:-d

3.DTM is used to manufacture either having component feature less than _____ µm or to achieve
submicron/ nano metric surface finish.

a)1

b)10

c)100

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d)0.1

Ans:-c

4.In DTM process diamond is mostly prefer for machining of nonferrous metal such as _____.

a)copper

b)cobalt

c)Nickel

d)Nital

Ans:-a

5.The tool nose radius used for DTM process is varies from _____________ mm.

a)0.1 to 0.2

b)0.2 to 0.3

c)0.1 to 0.3

d)0.2 to 0.4

Ans:-d

6.In DTM process diamond can convert to _________ at high temperature above 700degree celsius.

a)Silica

b)carbide

c)graphite

d)ferrite

Ans:-c

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7.Which of them are the parameters of tool geometry in DTM.

a)Cutting Edge

b)Clearance angle

c)Cylindrical tool

d)all of these

Ans:-d

8.The following diagram related with_____________ process.

a)Ultrasonic Micromachining

b)DTM

c)FIBM

d)Photo chemical Machining

Ans:-b

9.From the following is not the process parameters of DTM.

a)Spindle ratio

b)Feed rate

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c)depth of cut

d)Clearance feed

Ans:-d

10.Ultrasonic micromachining use to machine hard and brittle materials such as

a)sapphire

b)aluminium

c)cuprous

d)iron

Ans:-a

11.The size of the abrasive particle in USMM process is in range of ___________µm.

a)0.5-15

b)0.1-5

c)1-5

d)0.01-0.5

Ans:-a

12.In the ______________ process the vibration is given to the tool or the workpiece.

a)USM

b)USSM

c)USW

d)none of these

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Ans:-b

13.The following figure related to which Process.

a)Ultrasonic Micromachining

b)DTM

c)FIBM

d)Photo chemical Machining

Ans:-a

14.Which of these is not hte basic element of the USMM.

a)CNC controller

b)Abrasive Slurry

c)transformer

d)Acoustic head

Ans:-c

15.THe USMM employs mechanical vibration with frequency within range of _________ kHz.

a)50-100

b)20-40

c)10-60

d)4-10

Ans:-b

16.In USMM , __________ mechanism used to removed the material due to repetitive impact of the free
moving abrasive particles on the workpiece surface.
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a)Mechanical Abrasion

b)Cavitations effect

c)Micro chipping

d)Chemical Action

Ans:-c

17.In USMM the size of the abrasive particles is varies in the range from ___________grit.

a)10-50

b)200-2000

c)500-1000

d)100-200

Ans:-b

18.Which of these is not the performance characteristics of the USMM process.

a)Aspect ratio

b)the cutting ratio

c)Toll wear rate

d)Tool geometry

Ans:-d

19.In Focused Ion Machining Process __________ is a phenomenon whereby atoms are ejected from
solid target material by transfer of kinetic energy from incident ion to the target atoms.

a)Sputtering

b)collision cascade
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c)Amorphization

d)None of these

Ans:-a

20.In ____________ in FIB process several atoms will be ejected from the target surface and incident ion
implanted deep inside the target surface and damage the lattice structure by displacing adjacent atom.

a)Sputtering

b)collision cascade

c)Amorphization

d)None of these

Ans:-b

21.The Material removal rate of FIB is _________.

a)High

b)Low

c)Medium

d)Higher USSM

Ans:-b

22.In FIB the ion column is tilted _____ degrees to electron column so that the real time image can be
seen easily.

a)20

b)45

c)52

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d)56

Ans:-c

23.Following is not the component of FIB process.

a)reflecting base

b)Ion Column

c)Electron Column

d)Gas injection

Ans:-a

24.The following diagram is related with which process?

a)Ultrasonic Micromachining

b)DTM

c)FIBM

d)Photo chemical Machining

Ans:-c

25.What is(are) the factors below that affect the machining characteristics?

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a) Sputtering speed

b)Electron speed

c)Amorphization

d)Angle of incident

Ans:-d

26.Which process is generally use to manufacture the integrated circuit in the electronics industries.

a)Ultrasonic Micromachining

b)Lithography

c)FIBM

d)Photo chemical Machining

Ans:-b

27.Which of the following process is a keystone of the nanotechnology revolution.

a)Ultrasonic Micromachining

b) FIBM

c)Lithography

d)Photo chemical Machining

Ans:-c

28.Which of the following is(are) the type of lithography.

a)Optical

b)X-Ray

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c)Electron beam

d)all of these

Ans:-d

29.The following diagram is related with which process.

a)Ultrasonic Micromachining

b) FIBM

c)Lithography

d)Photo chemical Machining

Ans:-c

30.In Lithography, once the substrate is prepared, is the n cooled with organic polymer known as
_____________

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a) photoresist

b)positive working

c)Negative working

d)None of these

Ans:-a

31.In lithography prebaking the wafer is the process to remove the solvent from the photoresist which is
carried out on __________________ heated around 100 degree Celsius.

a)Panel

b)Hot plate

c)base plate

d)transparent glass

Ans:-b

32.The source of radiation in X-ray which is having a shorter wavelength in range of ______ nm
generated by the synchronous source.

a)1-5

b)0.2-1.5

c)0.4 - 4

d)1.5 - 5

Ans:-c

33.In the____________ process chemical milling is done used to fabricate sheet metal component using
photoresist method.

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a)Photo tool Production

b)X-Ray Lithography

c)Electron-beam Lithography

d)Photochemical Machining

Ans:-d

34.From below is one of the step in optical lithography.

a)Prebake

b)Photo tool production

c)developing

d)Matching

aAns:-a

35.From the below one of the process is not the step in Photochemical Machining.

a)Prebake

b)Photo tool production

c)developing

d)Matching

Ans:-a

36. In abrasive jet machining, material is removed by shear as well as brittle deformation of the material.
a) True
b) False

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Answer: a
Explanation: If the KE of the abrasive particle is high enough, then it will remove the material by shear
deformation in case of ductile workpiece material and by brittle fracture if workpiece material is brittle.

37. Holes up to _____ deep can be drilled without using AJM process.
a) 10 nm
b) 45 mm
c) 66 μm
d) 100 μm

Answer: c
Explanation: In AJM, holes up to 66 μm deep can be drilled without employing any special techniques. This
process is also useful for producing microcavity.

38.I n thermal advanced micromachining process, intense heat is produced.

a) True
b) False

Answer: a
Explanation: In this process, localized intense heat is produced which increases temperature of the workpiece
in a narrow zone (i.e.Beamdiameter), equal to its melting or vaporization temperature. Which leads to removal
of material at micro/nano level in the form of debris (irregular shaped particles or spherical globules).

39. Magnetic Float Polishing is a technique based on_____

a) magneto-dynamic behaviour
b) magneto-hydrodynamic behaviour
c) kinematic behaviour
d) viscosity

Answer: b
Explanation: Magnetic Float Polishing is a technique based on the Magnet on hydrodynamic behaviour of the
magnetic fluid which in the presence of magnetic field can levitate a non-magnetic float and abrasive particles
suspended in it.

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40. Abrasive flow machining (AFM) is used for _____
a) de-burring
b) etching
c) drilling
d) cutting

Answer: a
Explanation: AFM was developed by Extude Home Corporation USA in 1960 as a method to deburr, polish
and radius difficult to reach surface like intricate geometries and edges by flowing an abrasive laden
viscoelastic medium over them.

41. Thermal micromachining processes can be used to produce reduced hole diameter, lower hole pitch.
a) True
b) False Answer: a
Explanation: Reduced hole diameter, lower hole pitch and longer head can be manufactured by thermal
micromachining processes. These processes are used to manufacture computer hard disc drive heads, inkjet
printer heads, sensors, infrared images.

42. MAF was developed to produce efficiently and economically good quality finish material.
a) True
b) False

Answer: a
Explanation: MAF was developed to produce efficiently and economically good quality finish on the internal
and external surface of tubes as well as flat surface made of magnetic or non-magnetic material.

43. In Abrasive jet Micromachining is used for _____

a) making finished surfaces
b) thread finishing
c) making grooves
d) cutting

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Ans:- Answer: c
Explanation: This method is used for making accurate shallow holes or grooves, and, with the use of masks,
patterns on target material.

44. Which of the following is true about AJMM?

a) It is a low cost method
b) It is toxic towards the environment
c) It is hazardous to human health
d) It is not capable of anisotropic machining

Answer: a
Explanation: Advantages of AJM:
(1) low capital and operating costs,
(2) environment-friendly process,
(3) no major health hazards, and
(4) ability to machine anisotropic and suspended structures on the same substrate.

Short Answers for 1 and 2 Marks.

What is the formula of Sputtering Yield?

Define Amorphization.

What are the different steps followed in Photochemical Machining?

States the different application of FIB.

Classify diamond tool according to waviness control.

What is the main function of photoresist material?

What are the capabilities if DTM?

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 Uni
t4:Mi
croMachi
ningandNanoFabr
icat
ionTechni
ques

1.Micromachiningpr
ocesses(MMPs)ar
eusedt
oincr
easesel
ect
ivi
ty,
accur
acy
,
perf
ormance,etc.par
ameters.
a)True
b)False
ViewAnswer
Answer :a
Explanati
on:Mi cr
omachi ningprocesses( MMPs)areusedf
or;
(1)Minimizi
ngener gyandmat eri
alsusedinmanufact
uri
ngReduct
ionofpowerbudget
(2)Fasterdevices
(3)I
ncreasedsel ecti
vit
yandsensi ti
vi
ty
(4)I
mpr ovedaccur acyandr el
iabi
li
ty
(5)Cost/performanceadv antages
(6)I
ntegrati
onwi thelectr
onics,si
mpl i
fyi
ngsyst
ems.
2.Choosetheoddoneout
.
a)micr
o-AJM
b)micro-
USM
c)micr
o-AWJM
d)micro-
EDM
ViewAnswer
Answer :d
Explanati
on:Amongal lt
heprocesses,micro-AJM (microabrasivej
etmachini
ng),micr
o
-USM (microult
rasonicmachi
ning)micro-
AWJM ( microabrasiv
ewat erj
etmachini
ng)
usemechani calenergyt
oremov ethemat eri
al;whereas,micro-
EDM (microel
etr
o
dischargemachining)pr
ocessusesthermal energytoremov ethemat er
ial
.
3.Choosetheoddoneout
.
a)micr
o-tur
ning
b)micro-
mill
i
ng
c)micr
o-EBM
d)micro-
gri
nding
ViewAnswer
Answer:c
Expl
anati
on:Micr
o-t
urning,micro-
mill
ingandmi cr
o-gri
ndi
ngaretr
adit
ionalmater
ial
removalpr
ocesses;whereas,micro-
EBM (microelect
ronbeam machi
ning)pr
ocessis
oneoftheadvancedmanuf acturi
ngprocesses.
4.Choosetheoddoneout
.
a)Micr
o-EBM
b)LBM
c)EDM
d)ECMM
Vi
ewAnswer
Answer :d
Explanati
on:Micro-
EBM, LBM (l
aserbeam machini
ng)
,EDM (el
ectrondischar
ge
machi ni
ng)processesusesthermalenergyf
orremovi
ngmat er
ialandECMM
(el
ectrochemicalmicr
omachi ni
ng)processuseschemical
energyt or
emov emater
ial
.
5.Chooset
heoddoneout
.
a)EBM
b)ECM
c)EDM
d)LBM
ViewAnswer
Answer:d
Expl
anati
on:Amongallt
heabov ementi
onedpr ocesses,el
ectr
icdi
scharge
micromachi
ning(
EDM),elect
ronbeam micromachining(EBM)andelect
r ochemical
machini
ng(ECM)areusedonlyforel
ect
ricall
yconductingmateri
als;
wher eas,
laser
beam micr
omachini
ng(LBM)processcanbeusedf orbothconducti
ngandnon-
conduct
ingmater
ial
s.
6.Thermal
defor
mat
ionoft
hewor
kpi
ecei
sthemaj
orpr
obl
em i
nmi
cromachi
ning.
a)True
b)False
ViewAnswer
Answer :a
Explanation:Foll
owingarethemajorpr
obl
emsf
aceddur
ingmi
cromachi
ning;
•Mechani caldefor
mation
•Thermal deformati
on
•Surfaceintegri
ty
•Gapbet weent oolandworkpiece
•Coor di
nateshifti
ntoolhandli
ng.
7.Inabrasiv
ejetmachi
ning,
mat
eri
ali
sremov
edbyshearaswel
lasbr
it
tl
edef
ormat
ion
ofthemat eri
al.
a)True
b)False
ViewAnswer
Answer:a
Expl
anati
on:I
ftheKEoftheabrasi
vepart
icl
eishi
ghenough,
thenitwil
lremov
et he
materi
albysheardef
ormat
ionincaseofducti
l
eworkpi
ecemateri
alandbybri
ttl
e
fr
actur
eifworkpi
ecemater
iali
sbri
ttl
e.
8.Hol
esupt
o__
___deepcanbedr
il
ledwi
thoutusi
ngAJM pr
ocess.
a)10nm
b)45mm
c)66μm
d)100μm
ViewAnswer
Answer :
c
Explanat
ion:I
nAJM, holesupto66μm deepcanbedri
l
ledwit
houtemployi
ngany
specialt
echni
ques.Thisprocessi
sal
sousefulf
orpr
oducingmicr
ocav
ity.
9.Fusedionbeam machi
ningpr
ocessi
sbasedonbi
ndi
ngener
gyofat
omsi
nthe
workpiecemater
ial
.
a)True
b)False
ViewAnswer
Answer :a
Explanation:
Fusedi onbeam machi
ningprocessisnot
hingbutknocki
ngoutat oms
from thewor k-
piecesurf
acebythekineti
cmoment um t
ransf
erfr
om incidenti
ontot
he
targetatoms.Int hi
sprocessr
emoval ofatomsoccurwhentheactualenergy
transfer
redexceedst heusual
bindi
ngener gy.
10.I
nt her
mal
adv
ancedmi
cromachi
ningpr
ocess,
int
enseheati
spr
oduced.
a)True
b)False
ViewAnswer
Answer:a
Expl
anati
on:Int
hispr
ocess, l
ocal
izedintenseheatisproducedwhi chi ncr
eases
temperat
ureoft
hewor kpi
eceinanar rowzone( i
.e.
Beamdi ameter),equaltoit
smelti
ng
orvapori
zat
iont
emperature.Whichleadst oremovalofmat eri
alatmi cro/
nanolev
elin
thefor
m ofdebr
is(i
rr
egularshapedpar t
iclesorspher
icalglobul
es).

11.Ult
rasoni
cmachining(USM)canbecl
assi
fi
edaswhi
choft
hef
oll
owi
ngt
ypeofnon-
tr
adit
ionalmachi
ningprocess?
a)el
ectri
cal
b)opti
cal
c)mechanical
d)chemical
ViewAnswer
Answer :
c
Explanat
ion:Ult
rasonicmachini
ngisanon-t
radi
ti
onalmachi
ningprocess.USM i
s
groupedunderthemechani calgr
oupNTM processes.I
nul
tr
asonicmachi ni
ng,
atool
of
thedesiredshapev i
brat
esatanultr
asoni
cfrequency.
12.Whi choft
hef
oll
owi
ngmat
eri
ali
snotgener
all
ymachi
nedbyUSM?
a)Copper
b)Glass
c)Si
licon
d)Ger
manium
ViewAnswer
Answer:a
Expl
anation:USM i
smai nl
yusedformachini
ngbrit
tlemater
ial
swhichar
epoor
conductorsofel
ectr
ici
tyandthuscannotbeprocessedbyElect
rochemi
cal
andEl
ect
ro-
di
schargemachining.
13.Tooli
nUSM i
sgener
all
ymadef
rom whi
choft
hef
oll
owi
ngmat
eri
als?
a)Glass
b)Ceramic
c)Carbi
des
d)Steel
ViewAnswer
Answer:
d
Expl
anat
ion: Thet oolmateri
alshouldbesucht hati
ndentat
ionbytheabr
asiv
egri
ts
doesnotleadt obr i
tt
lef
ailur
e.Thust het
oolsaremadeoft ough,str
ongandduct
il
e
mater
ial
sl i
kest eel,
stai
nlesssteelandotherducti
lemetall
i
call
oys.
14.Underwhatf
requencyul
tr
asoni
cmachi
ningi
sdone?
a)5—10Hz
b)5—10kHz
c)12—19Hz
d)19—25kHz
ViewAnswer
Answer :d
Explanati
on:Ul
trasoni
cmachi
ningisamechanical
typenon-
tradi
ti
onalmachini
ng
process.Inul
tr
asonicmachi
ning,
at ool
ofdesi
redshapevi
bratesatanul
trasonic
fr
equencyofar ound19—25kHzwithanamplit
udeofaround15–50μm ov erthe
workpiece.
15.I
nultrasoni
cmachi
ning(
USM)
,thet
ool
ispr
esseddownwar
d.
a)True
b)False
ViewAnswer
Answer:a
Expl
anati
on: General
lyt
het oolispr
esseddownwardwit
hafeedfor
ce.Betweenthetool
andworkpiece,themachiningzoneisfloodedwi
thhar
dabr
asiv
eparti
clesgener
all
yin
thef
orm ofwat erbasedslurry
.
16.Inultrasoni
cmachi ning,
theabr
asi
vepar
ti
clesactast
he_
___
___
___
a)chipcar ri
ers
b)intenders
c)fini
shingparticl
es
d)thickeningagentfortheslur
ry
ViewAnswer
Answer :b
Explanati
on:
Dur i
ngult
rasoni
cmachini
ng,
ast hetool
vibrat
esovert
hewor kpi
ece,
the
abrasiv
eparti
clesactasthei
ndent
ersandindentbot
ht heworkmater
ial
andt het
ool
.
17.I
ncaseofbr
it
tl
emat
eri
als,
themat
eri
ali
sremov
edbycr
acki
nit
iat
ion.
a)True
b)False
ViewAnswer
Answer:a
Expl
anati
on:Theabr asi
veparti
cles,astheyindent
,theworkmater
ial,
wouldremovethe
same,part
icular
lyi
fthewor kmat er
iali
sbrit
tle,
duetocracki
nit
iat
ion,pr
opagat
ionand
bri
tt
lef
ractureofthemat er
ial
.
18.Dur i
ngUSM, cracksarepr
oducedduet
o__
___
a)von-misesstresses
b)hertzi
anstresses
c)pri
ncipalstr
esses
d)episodicacutestresses
ViewAnswer
Answer :b
Explanati
on: Dur
ingUSM, asthet oolvibrat
es,i
tleadst othei
ndentat
ionoftheabr asi
ve
gri
ts.Duringindentati
on,duet oher t
ziancontactstresses,cr
ackswoul ddevel
opjust
belowt hecontactsitethenasi ndentationprogressesthecrackswouldpropagatedue
toincreaseinstressandul t
imat elyl
eadt obrit
tl
ef ract
ureoftheworkmat er
ialunder
eachindividuali
nteract
ionsitebet weent heabrasivegrit
sandthewor kpi
ece.
19.InUSM, materi
alr
emoval
mayoccurduet
o__
___
a)fati
guefail
ure
b)fouli
ngfail
ure
c)freefl
owingimpactoft
heabr
asi
ve
d)creep
ViewAnswer
Answer :c
Explanati
on:Othert
hanbri
ttl
efai
lur
eoftheworkmateri
alduetoindentat
ionsome
materialr
emov almayoccurduetofreef
lowi
ngimpactoftheabr
asivesagainstthe
workmat eri
alandrel
atedsol
id-
soli
dimpacter
osion,
butiti
sesti
mat edtoberather
i
nsignifi
cant
.
20.Increasingvolumeconcentr
ationofabr
asi
vei
nsl
urr
ywoul
daf
fectMRRi
nwhi
chof
thefollowingmanner?
a)increaseMRR
b)decr easeMRR
c)woul dnotchangeMRR
d)init
iall
ydecreaseandthenincreaseMRR
ViewAnswer
Answer:a
Expl
anati
on:Theconcentrat
ionofabrasiv
egritsinthesl
urryisr
elatedasfol
low
n=(6AC)/πdg2,
wheren=numberofgr i
ts
A=total
surfaceareaofthetoolf
acingthewor kpi
ece
C=concentr
ationofabrasi
vegri
tsintheslurr
y
dg=di
ameterofagr i
t
Thusaboverelat
ionshowsthatanyincreasein‘C’wil
li
ncrease‘
n’ andhencemater
ial
removalr
ate(MRR) .
21.Whatist
hefullform ofIBM i
ntheadv
ancedmachi
ningpr
ocesses?
a)IonBeam Machining
b)IonBeam Manufact ur
ing
c)IonBl
astMachining
d)IonBl
astManufact uri
ng
ViewAnswer
Answer :a
Explanati
on:Thef
ull
for
m ofI
BM i
sIonBeam Machi
ningi
ntheadv
ancedmachi
ning
processes.
22.Stat
ewhet herthef
oll
owingst
atementist
rueorfal
seregar
dingI
BM.
“I
nIBM, vacuum chamberi
snotnecessar
yunli
kethatofEl
ectr
onbeam machi
ning.
”
a)True
b)False
ViewAnswer
Answer:
b
Expl
anat
ion:
Ionbeam machi
ningal
sor
equi
resav
acuum chamberl
i
ket
hatr
equi
redf
or
El
ectr
onbeam machi
ning.
23.Whichofthef
ollowi
ngarethecomponent
sofI
onbeam machi
ning?
a)Vacuum chamber
b)Volt
agesource
c)Tungst
enf i
l
amentcathode
d)All
ofthementioned
ViewAnswer
Answer :
d
Explanat
ion:Mai
ncomponent
sofIBM ar
evacuum chamber,v
olt
agesour
ce,
tungst
en
cathodefil
ament
,pl
asmasourceofar
gonatomsandl ens.
24.Howdoest heionsst r
iketheworkpi
ecei
nmachi
ningusi
ngI
BM?
a)Obli
questr
iking
b)Normali
ncidentstri
king
c)Obl
ique&Nor mali
ncidentstr
iki
ng
d)Noneofthement ioned
ViewAnswer
Answer:c
Expl
anati
on:Thei
onsmayst
ri
keobl
i
quel
yoratnor
mal
inci
dencei
nIonBeam
machini
ng.
25.Numberofat omsyi
eldedi
nobl
i
quecut
ti
ngi
s__
___
___
__nor
mal
inci
dence.
a)Greaterthan
b)Lesserthan
c)Sameas
d)Noneoft hementi
oned
ViewAnswer
Answer :
a
Explanat
ion:
Numberofatomsyi
eldedf
orani
nci
dentat
om i
nobl
i
quecut
ti
ngi
sgr
eat
er
thannormalinci
dencei
nIBM.
26.Howmuchamountofener
gyi
srequi
redf
oref
fect
iver
emov
alofat
oms?
a)1to5eV
b)5to10eV
c)10to15eV
d)15to20eV
ViewAnswer
Answer:
b
Expl
anat
ion:
About5t
o10eVofener
gyi
srequi
redf
oref
fect
iver
emov
alofat
oms.
27.Machi ni
ngrat
esinIBM dependonwhi
choft
hef
oll
owi
ngf
act
ors?
a)Wor kpiecemateri
al
b)Ionstype
c)Inci
dentangle
d)Allofthementioned
ViewAnswer
Answer:
d
Expl
anat
ion:
Themachini
ngr
atesory
iel
ddependsonmat
eri
alt
obemachi
ned,
typeof
i
onsandinci
dentangl
e.
28.Whati
sthev
alueofv
olt
ager
equi
redf
ormachi
ningi
nIonbeam machi
ning?
a)1kV
b)2kV
c)3kV
d)4kV
ViewAnswer
Answer :
a
Explanat
ion:Theval
ueofv
olt
ager
equi
redf
ormachi
ningi
nIonbeam machi
ning
processisabout1kV.
29.Whatar
etheval
uesofcur
rentdensi
ti
esr
equi
redi
nIBM?
a)0.
25mA/ cm2
b)0.35mA/cm2
c)0.55mA/cm2
d)0.85mA/cm2
ViewAnswer
Answer:d
Expl
anati
on:Thev
alueofcur
rentdensi
tyofabout0.
85mA/cm2 
i
srequi
redf
or
machini
ngtheworkpi
ecemateri
alsinI
onbeam machini
ng.
30.Whati
sthev
alueofbeam di
amet
ert
hati
sobt
ainedi
nIBM?
a)1cm
b)3cm
c)5cm
d)7cm
ViewAnswer
Answer:
c
Expl
anat
ion:
Theval
ueofthebeam di
amet
erf
ormachi
ningt
hewor
kpi
ecemat
eri
ali
n
I
onbeam machi
ningi
sabout5cm.

31.Whatar
ethedimensi
onst
hatcanmachi
nedonI
BM?
a)0.1t
o1nm
b)1to10nm
c)10to100nm
d)100to1000nm
ViewAnswer
Answer:c
Expl
anati
on:Smal
ldi
mensi
onsas10t
o100nm canal
sobemachi
nedonI
onbeam
machini
ng.
32.Theslopeoft hesidewal
l
sdependsonwhi
choft
hef
oll
owi
ngf
act
ors?
a)Volt
agesuppl y
b)Angleofincidence
c)Flux
d)Currentdensit
y
ViewAnswer
Answer:b
Expl
anati
on:
Theslopeoft
hesi
dewal
l
soft
hesur
faceandi
tssur
facef
ini
shdependon
theangl
eofinci
dence.
33.Whatar
etheaccur
acyl
evel
sthatar
eobt
ainedbyusi
ngI
BM?
a)±1.
0%
b)±2.
0%
c)±3.
0%
d)±4.
0%
Vi
ewAnswer
Answer:
a
Expl
anat
ion:Theaccur
acyl
evel
sthatar
eobt
ainedwhenmachi
nedt
hewor
kpi
eceusi
ng
I
BM isabout±1.0%.
34.Whatar
ethev
aluesofr
epeat
abi
l
ityobt
ainedi
nIonbeam machi
ning?
a)±1.0%
b)±2.0%
c)±3.
0%
d)±4.0%
ViewAnswer
Answer:
a
Expl
anat
ion:Ar
epeatabi
li
tyofabout±1%ar
eobt
ainedwhi
l
emachi
ningt
hewor
kpi
ece
usi
ngIonbeam machini
ngprocess.
35.Surf
acet
ext
uri
ngpr
oducesacone-
and-
ri
dgel
i
keconf
igur
ati
onont
heor
derofwhi
ch
si
ze?
a)0.5µm
b)1µm
c)1.5µm
d)2µm
ViewAnswer
Answer:
b
Expl
anat
ion:
Sur
facet
extur
ingproducesacone-
and-
ri
dge-
li
keconf
igur
ati
onont
heor
der
of1µm insi
zei
nIonbeam machini
ng.
36.Whati
sthev
alueofsur
facef
ini
shobt
ainedbyusi
ngI
onbeam machi
ning?
a)<1µm
b)<3µm
c)<5µm
d)<7µm
ViewAnswer
Answer:
a
Expl
anat
ion:
Thesmoot
hnessoft
hesur
facef
ini
shobt
ainedi
nIonbeam machi
ningi
s
l
essthan1µm.
37.Whi chofthef oll
owingar
etheappl
i
cat
ionsofI
BM?
a)Smoot hi
nglasermi r
ror
s
b)Polishingsurfaces
c)Shapi ngsurf
ace
d)Alloft hement i
oned
ViewAnswer
Answer:
d
Expl
anat
ion:
Smoot
hingofl
asermi
rr
ors,
pol
i
shi
ngandshapi
ngofopt
ical
sur
facesar
e
someoft
heappl
i
cat
ionsofI
onbeam machi
ning.
38.Stat
ewhet hert
hefol
lowingstat
ementi
st r
ueorf
alseregardingtheappl
i
cat
ionsof
IBM.
“InI
BM, t
hicknesscanbereducedwhichaf
fectst
hesurf
acefinish.
”
a)True
b)False
ViewAnswer
Answer:
b
Expl
anat
ion:Reduct
ionoft
hicknessoft
hinf
il
mscanbedonewi
thoutaf
fect
ingt
he
surf
acefi
nish.
39.Whatar
ethet
hicknessv
aluesofsi
l
iconsampl
est
hatcanbet
hinned?
a)1to5µm
b)5to10µm
c)10to15µm
d)15to20µm
ViewAnswer
Answer:
c
Expl
anat
ion:
Thi
cknessr
angi
ngf
rom 10t
o15µm canbet
hinnedusi
ngI
BM.
40.Whichofthef
ollowi
ngmat
eri
alscanbet
ext
uredusi
ngt
heI
BM pr
ocess?
a)Copper
b)Nickel
c)Stai
nlessst
eel
d)Allofthement
ioned
ViewAnswer
Answer:d
Expl
anati
on:Mat
eri
alssuchasCopper
,st
ainl
essst
eel
,ni
ckel
,si
l
verandgol
dcanbe
usedforpr
oduci
ngtext
uredconesusi
ngI
BM.
41.Howmuchamountofener
giesar
erequi
redf
orr
emov
alofoxi
del
ayer
s?
a)Small
b)Larger
c)Moderate
d)All
ofthement
ioned
ViewAnswer
Answer:b
Expl
anati
on:
Higherener
giesar
eneededf
ort
her
emov
alofl
ayerofoxi
desont
he
surf
acesusi
ngIonBeam machini
ng.
42.Lit
hographywasinv
ent
edby_
___
___
___i
n1798.
a)AloisSenefel
der
b)JohnDenv er
c)Bil
lyArmstrong
d)ManuelNeuer
ViewAnswer
Answer:a
Expl
anati
on:Al
oisSenef
elderi
n1798i
nvent
edl
i
thography
.Theor i
ginal
methodut
il
ized
sandst
onerockuponwhichanimagewasmadeusingathick,
greasymater
ial
.
43.Thesur f
aceistreat
edwi t
ha_ _
___
_ __
__t
hati
ssoakedi
ntot
hei
magear
ea,
but
avoi
dedt heH2Ot r
eated,non-
imagearea.
a)Polari
nk
b)Non-polarink
c)Sil
kscreen
d)Pressurescreen
ViewAnswer
Answer :b
Explanati
on:Thesur
facei
streatedwit
hanon- pol
arink( oi
l,
wax, soap,
andcarbonsoot)
thatsoakedintot
heimagearea,butavoidedt
heH2Ot reated,non-i
magearea.Someof
theinkfrom t
hemessageisdissolv
edint hel
eastpossibleamountofasuitabl
esolvent
,
andt hat
’sal
sospott
edontothesamel ine.
44.TheH2Osol ut
ionut
il
isedt
opr
eventpr
int
ingi
nthenon-
pri
ntar
easi
scal
l
edt
he
____
_ __
___
a)Lasersoluti
on
b)Electr
ophotocopysoluti
on
c)Fountainsoluti
on
d)Dy esolut
ion
ViewAnswer
Answer:c
Expl
anati
on:Thedampeni
ngsystem onal
ithographicsheetf
edpressappl
iesaH2O-
baseddampeningorf
ount
ainsolut
iontot
hepr i
ntingplat
ebefor
eitisi
nked.Dampeni
ng
sol
uti
onskeepthenon-
imageareasofaplatemoi st
enedsothattheywoul
dnotaccept
i
nk.
45.Laserpri
nti
ngmethodissometi
mescal
l
edpl
anogr
aphi
cpr
int
ingsi
ncet
hei
mage
andnon-imageareasar
einthesamepl
ane.
a)True
b)False
ViewAnswer
Answer :
b
Explanat
ion:
Lithographymethodissometi
mescal l
edplanographi
cpri
nti
ngsi
ncethe
i
mageandnon- imageareasareinthesameplane.Planogr
aphicdenot
esapri
nti
ng
processinwhichthepr i
nti
ngsur
faceisfl
at,
asinlit
hography.
46.Thesystem ut
il
isedt
oappl
ytheH2Osol
uti
ont
othepl
atesur
facei
scal
l
edt
he
___
_______
a)Dissoci
ati
ngsystem
b)Dampeni ngsystem
c)H2Ohatingsystem
d)Lit
ter
ing
ViewAnswer
Answer:c
Expl
anati
on:I
tmakest henonimageareahydrophi
licandleavestheimagear
ea
hydr
ophobic[
H2Ohat i
ng,butnonpol
arinkl
oving(oleophi
l
ic)]
.It
’sthesyst
em t
hat
tr
ansfer
sawat er
-basedfount
ainsol
uti
ontotheprinti
ngplateasameansofmaking
non-
imageareasinkrepel
lent
.
47.Theplat
esur
facei
softenathi
n___
____
___pl
atewr
appedt
ight
lyar
oundacy
li
nder
.
Everyti
methecy
li
nderr
otates,
acopycanbemade.
a)Copper
b)Magnesium
c)Calci
um
d)Alumini
um
ViewAnswer
Answer:d
Expl
anati
on:Bi
metal
li
cplat
esaremadeusing2metal
sofdif
fer
entproper
ti
es.
Alumi
nium (
Al)i
sthe3rdmostabundantel
ementi
ntheEar
th’
scrust
.
48.Mostli
thogr
aphyiscarri
edoutasof
fsetpr
inti
ng;t
hei
mageont
hei
nkpl
atei
s
tr
ansfer
redtoarubbersheetandfr
om t
heblankettot
hepaper
.
a)True
b)False
ViewAnswer
Answer:a
Expl
anati
on: I
nkisappl
iedt oagrease-
tr
eatedimageuponthefl
atpri
nti
ngsurf
ace.
Mostli
thographyiscar
riedoutinawayt hatt
heimageont hei
nkplat
eistr
ansfer
red
off
settoarubbersheett hebl
anketandfrom t
heblankett
othepaperasopposedto
di
rectpri
nti
ng.
49.The_ ____
____
_balancei
noff
setli
thogr
aphicpr
int
ingiscr
iti
cal
.Al
so,
theuti
l
izat
ion
ofthedampeni ngsy
stem compl
icat
esthepressanditsoper
ati
onandaddstoit
sinit
ial
cost.
a)Ink/H2O
b)Starch/H2O
c)Pulp/solv
ent
d)Ink/st
arch
ViewAnswer
Answer:a
Expl
anati
on:Theflatpri
nti
ngsurfaceandblankareaswhichholdmoist
urerepel
sthe
l
it
hographici
nk.Thisinkedsur
faceisthenprint
ed,ei
therdi
rect
lyonpaper
,bymeansof
aspecial
press.
50.________
__mustbedesignedespeci
all
yforthissyst
em t
obeeffecti
ve;
thepr
incipal
di
f f
erenceisthatt
he__
________v
ehicl
ethat’
sselectedmustgi
vesuit
abler
heol
ogical
properti
essuchasafair
lyhighvi
scosi
ty.
a)Ink
b)Steel
c)Aluminium
d)Copper
ViewAnswer
Answer:
a
Expl
anat
ion:
It’
saliqui
dorpast
ethatcont
ainspigment
sordy esandi
suti
l
izedtocol
or
asurf
acetoproduceanimage,
text
,ordesi
gn.Inkisut
il
izedf
ordrawi
ngorwrit
ingwi
th
apen,br
ush,orqui
l
l.
51.Dotgai
nint
hemi
dtonesi
ssai
dtobeabout_
___
___
___l
owert
hanwi
thconv
ent
ional
l
it
hography
.
a)10%
b)20%
c)30%
d)40%
ViewAnswer
Answer:
a
Expl
anat
ion:
Mostoffsetpr
essescanbeconver
tedtoaH2Ol esspri
nti
ngbyaddingan
i
nkcooli
ngsyst
em andusingtheappr
opr
iat
eplatesandinks.Dotgai
nint
hemi dtones
i
ssaidtobeabout30%lowerthanwit
hconvent
ionall
it
hography.

52.I
nadvancedmachi ni
ngprocess,
whati
sthef
ull
for
m ofPCM?
a)Phot
ochemi calmanuf
acturi
ng
b)Phot
ochemi calmachi
ning
c)Phot
ocrystall
inemanufact
uri
ng
d)Phot
ocrystall
inemachini
ng
ViewAnswer
Answer :
b
Explanat
ion:
Ful
lfor
m ofPCM i
nadv
ancedmachi
ningpr
ocessesi
sPhot
ochemi
cal
mill
i
ng.
53.I
nt hi
smet hod,whichofthef
oll
owi
ngt
echni
quesar
eusedt
oappl
ythemaskanton
themachi ningsurf
ace?
a)Photogr aphict
echniques
b)Cutandpeel masking
c)Sil
kscreenr esi
sttechni
que
d)Noneoft hement i
oned
ViewAnswer
Answer
:a
Explanati
on:Maskanti
sappl
i
edont
hemachi
ningsur
faceusi
ngphot
ogr
aphi
c
techniquesi
nPCM.
54Whatisthesimil
arit
ybet
weennor
mal
Chemi
cal
mil
l
ingpr
ocessandPhot
ochemi
cal
mill
i
ng?
a)Bothusechemicals
b)Maskantappl
icati
onmethod
c)Noneofthement i
oned
d)Alloft
hementioned
ViewAnswer
Answer:
a
Expl
anat
ion:
Bot
hmet
hodar
esi
mil
ari
nonepr
oper
tyi
.e.
.,
theybot
husechemi
cal
s.
55.I
nsomecases,Photochemi
cal
mil
l
ingcanal
sobecal
l
edas_
___
___
___
___
_
a)Phot
ochemicalbl
asti
ng
b)Phot
ochemicalbl
anking
c)Phot
ochemical
dril
li
ng
d)Phot
ochemicaler
osion
ViewAnswer
Answer :
b
Explanat
ion:I
nsomecasesflat
,thi
ngaugecompl
expar
tscanbemachi
ned,
thi
s
processisknownasPhotochemicalBl
anki
ng(
PCB).
56.Photochemical
blankingcanbeusedtomachi
net
hepar
tst
ohi
ghpr
eci
sion,
upt
o
whichofthefol
l
owingthicknessval
ues?
a)0.001–0.007mm
b)0.007–0.012mm
c)0.013–1.503mm
d)1.612–2.125mm
ViewAnswer
Answer :c
Explanati
on:
PCBcanbeusedt
omachi
nepar
tsoft
hickness0.
013–1.
50mm t
ohi
gh
precisi
on.
57.Stat
ewhet hert
hefol
lowingst
atementi
str
ueorfal
seregar
dingPhot
ochemi
cal
mill
i
ng.
“Unl
ikethatofCHM, PCM canal
sobeusedtocreat
epart
s.”
a)True
b)False
ViewAnswer
Answer:a
Expl
anati
on:InCHM or
igi
nalpar
tsmanufact
uredi
not herpr
ocessesar
emachined.
Unli
kethatcase,
inPCM par
tscanbecreat
edfrom t
hinsheetsusi
ngmaskant
s.
58.I
ncaseofphot
ochemi
cal
mil
l
ingt
hatuseusi
ngl
ett
eri
ngandgr
aphi
csf
orsur
face
etchi
ng,whatwil
lbethedept
hofsur
faceet
ched?
a)Verydeep
b)Upt ocer
tai
ndepth
c)Half-
way
d)Noneofthement i
oned
ViewAnswer
Answer:b
Expl
anati
on:Someti
mesphotochemi
calmachi
ningi
susedt
osurface-
etchcomponent
s
wit
hlet
teri
ngorgraphi
cs,
inwhichet
chantwor
kstoonl
yacert
aindepth.
59.Whenwasthepr
ocess,
Phot
ochemi
cal
mil
l
ingi
sint
roducedt
othemachi
ning
envi
ronment
?
a)1920s
b)1930s
c)1950s
d)1960s
ViewAnswer
Answer:
d
Expl
anat
ion:
PCM wasi
ntr
oducedt
othemachi
ningi
ndust
ryi
n1960s,
asanof
fshootof
PCBs.
60.Stat
ewhet herthefol
l
owingstat
ementistr
ueorf
alser
egar
dingPCM.
“I
nPCM, et
chingdepthdoesnotdependontheti
me,
acomponentisi
mmersedi
nthe
chemicalsoluti
on.
”
a)True
b)False
ViewAnswer
Answer:b
Expl
anati
on:AsincaseofCHM,dept
hofet
chi
nPCM dependupont
het
imeofpar
t
i
mmer sedinchemical
sol
uti
on.
61.Whi chofthef oll
owingprocessesdoesnotcomeunderChemi
cal
machi
ning
processes?
a)Chemi calmilli
ng
b)Photof or
mi ng
c)Photochemi calfi
ll
ing
d)Photochemi calblanki
ng
ViewAnswer
Answer :
b
Explanat
ion:
Phot
oformingisapr
ocessofelect
roplat
ingmet
alsov
ert
hemandr
els
whichdoesnotusechemicalf
ormat
eri
alremoval.
62.Whichofthefol
lowingisthefi
rstst
epi
nPhot
ochemi
cal
mil
l
ingpr
ocess?
a)Generat
ionofphotographi
cfil
m
b)Et
chingthepart
c)Removalofetchant
d)Phot
oresiststr
ippi
ng
ViewAnswer
Answer:
a
Expl
anat
ion:
Gener
ati
onofphot
ogr
aphi
cfi
l
m usi
ngCADdr
awi
ngsi
sthef
ir
stst
epi
n
PCM.
63.Whati
stheot
hernamef
orphot
ogr
aphi
cfi
l
m gener
atedi
nPhot
ochemi
cal
mil
l
ing?
a)Phot
omask
b)Phot
otool
c)Phot
ocover
d)Phot
oplat
e
ViewAnswer
Answer:b
Expl
anati
on:Thephot
ogr
aphi
cfi
l
m gener
atedusi
ngCADdr
awi
ngs,
whi
chi
sal
socal
l
ed
asPhototool
.
64.Whatisthenextstepaf
tergener
ati
onofPhot
o-t
ool
?
a)Chemicalcl
eaning
b)Coati
ngofphototool
c)Noneofthement i
oned
d)All
ofthement i
oned
ViewAnswer
Answer:
d
Expl
anat
ion:
Aft
ergener
ati
onofphot
o-t
ool
,i
tisappl
i
edt
othechemi
cal
l
ycl
eanedwor
k
surf
ace.
65.Whati stheuseofphototooli
nPhotochemi
cal
mil
l
ingpr
ocess?
a)Cleaningofworkpiece
b)Protecti
onofsurfaceagai
nstetchi
ng
c)Etchingofpartsurf
ace
d)Noneoft hement i
oned
ViewAnswer
Answer:
b
Expl
anat
ion:
InPCM,phototooli
sappl
i
edascoat
ingwhi
chactasst
enci
lresi
stt
hat
prot
ectt
hesurf
acef
rom etchi
ng.
66.Wherearethephotot
ool
sappl
i
edont
hesur
faceoft
hewor
kpi
ecemat
eri
al?
a)Onthetop
b)Onthebottom
c)All
ofthementioned
d)Noneofthement i
oned
ViewAnswer
Answer
:c
Expl
anat
ion:Phot
otool
sareappl
i
edinpai
rs-oneont
het
opandoneont
hebot
tom l
i
ke
sandwi
chingworkpi
ecebet
weenphotol
ayers.
67.Thephot otooli
sexposedt
owhi
chl
i
ghtsour
ce,
inor
dert
ofor
m ar
epl
i
caofi
mage
oftherequir
edgeomet r
y?
a)Inf
raredsources
b)Ult
raviol
etsource
c)Normal l
ightsour
ce
d)Noneoft hement i
oned
ViewAnswer
Answer:
b
Expl
anat
ion:
Ult
ravi
oletli
ghtsourcesar
eusedt
otr
ansf
ert
hei
mageoft
her
equi
red
geometr
yontotheresist
,preci
sely.
68.Whi chcanbeusedassol
uti
onswhi
chdev
elopt
hephot
oresi
stsi
nPCM?
a)Wat er
b)Alkalinesolut
ion
c)Hydr ocarbons
d)Alloft hement i
oned
ViewAnswer
Answer:d
Expl
anati
on:
InPCM,
thesol
utionsment
ionedabov
ecanbeusedt
odev
elopt
he
phot
oresi
stf
il
msonthesur
faces.
69.Whatisthenextst
epaft
ercr
eat
ingt
hephot
otool
andadher
ingi
ttowor
kpi
ece
usingUVli
ghtsource?
a)Fini
shi
ng
b)Etchi
ng
c)Rinsi
nganddryi
ng
d)Noneofthement i
oned
ViewAnswer
Answer:
b
Expl
anat
ion:
Aft
ert
hei
magei
sadher
edt
owor
kpi
ece,
etchi
ngi
sdone.
70.Therightchoiceofet
chantdependon,
whi
choft
hef
oll
owi
ngf
act
ors?
a)Rateofmat eri
alremoval
b)Etchi
ngdept h
c)Costandqual i
ty
d)Alloft
hement ioned
ViewAnswer
Answer:
d
Expl
anat
ion:
Etchantsel
ect
iondependsoncost
,qual
i
ty,
etchdept
handMRRr
ate.
71Afteret
chi
ngi
sdone,
whati
sthenextst
epi
nPhot
ochemi
cal
mil
l
ingpr
ocess?
a)Fi
nishi
ng
b)Rinsi
nganddryi
ng
c)Remov al
ofprot
ecti
velay
er
d)Noneoft hementi
oned
ViewAnswer
Answer:
b
Expl
anat
ion:
Aft
eret
chi
ngi
sdonei
nPCM,
thepar
tsar
eri
nsedanddr
ied.
72.Howaretheprotect
ivel
ayercoat
ingsont
hepar
tsar
eremov
ed?
a)Useofchemicals
b)Mechani
calt
echniqueswithchemical
s
c)Noneofthement i
oned
d)All
ofthementioned
ViewAnswer
Answer:
d
Expl
anat
ion:
Thepr ot
ect
ivelay
ersar
eremov
edbyt
heuseofchemi
cal
sandbyusi
ng
mechani
caltechni
queswit
hchemical
s.
73.Whichoft hef
oll
owi
ngar
ethemet
alst
hatcanbemachi
nedusi
ngPhot
ochemi
cal
mill
i
ng?
a)Aluminium
b)Copper
c)Nickel
d)Allofthementi
oned
ViewAnswer
Answer :
d
Explanat
ion:Copper
,al
umini
um,zi
nc,
steel
,mol
ybdenum,
zir
coni
um,
tit
ani
um ar
esome
ofthemet al
sthatcanbemachi
nedusi
ngPCM.
74.Whichofthefollowi
ngnon-
met
all
i
cmat
eri
alst
hatcanbemachi
nedusi
ngPCM?
a)Glass
b)Ceramics
c)Somepl ast
ics
d)Alloft
hement ioned
ViewAnswer
Answer:
d
Expl
anat
ion:
Thenon-
met
all
i
cmat
eri
alsment
ionedabov
e,canbemachi
nedusi
ngPCM.
75.Whichofthefoll
owingmat
eri
alsar
eexcel
l
entf
orPhot
ochemi
cal
mil
l
ing?
a)Brit
tl
emateri
als
b)Ductil
emateri
als
c)Elast
icmater
ial
s
d)Noneofthement ioned
ViewAnswer
Answer
:a
Expl
anat
ion:
Brit
tl
emat er
ial
sar
eexcell
entcandi
dat
esf
orPCM,
sincet
heyt
endt
obr
eak
easi
l
yusingtr
adit
ional
machini
ngprocesses.
76.Stat
ewhet
herthef
oll
owingst
atementistr
ueorf
alseaboutappl
i
cat
ionsofPCM.
“Usi
ngPCM,veryhi
ghtemperedmater
ial
saremachi
nedeasil
y.”
a)True
b)False
ViewAnswer
Answer :
a
Explanat
ion:PCM canbef
avourabl
ef orv
eryhi
ght
emperedandbr
it
tl
emat
eri
alsunl
i
ke
thatoftradi
ti
onal
machini
ng,wheretheytendt
obr
eakeasi
ly
.
77.Whichofthefoll
owingar
ethetypi
cal
appl
i
cat
ionsofPhot
ochemi
cal
mil
l
ing?
a)Product
ionofsigns
b)Product
ionofl
abels
c)Fabri
cati
onofboxesandenclosur
es
d)Alloft
hementioned
ViewAnswer
Answer:
d
Expl
anat
ion:
Usi
ngPCM,
theabov
ement
ionedappl
i
cat
ionscanbef
ulf
il
led.
78.Whatistheval
ueoft
hicknessofwor
kpi
ecest
obeusedi
nPCM?
a)0.001–0.003mm
b)0.013–1.50mm
c)1.50–2.35mm
d)2.50–3.33mm
ViewAnswer
Answer:
b
Expl
anat
ion:
Thet
hicknessv
alueofwor
kpi
ecesi
nPCM r
angebet
ween0.
013–1.
50
mm.
79.Whattypeofworkpiecesmustbeusedi
nPhot
ochemi
cal
mil
l
ingpr
ocess?
a)Bentsur
faces
b)Roll
edsur f
aces
c)Fl
atsurf
aces
d)Noneoft hementi
oned
ViewAnswer
Answer:
c
Expl
anat
ion:
Thewor
kpi
ecesmustbef
lati
nor
dert
ocar
ryont
hePCM pr
ocess.
80.Whichoft hefol
lowingi
ndust
ri
esusePCM f
ordi
ff
erentappl
i
cat
ions?
a)El
ectronic
b)Automot i
ve
c)Tel
ecommuni cat
ion
d)All
oft hement i
oned
Vi
ewAnswer
Answer :
d
Explanat
ion:
PCM hasit
sappli
cat
ionsintheindust
ri
essuchaselect
roni
cs,
aut
omot
ive,
tel
ecommuni cat
ion,
comput
er,medical
,aer
ospaceandotheri
ndustr
ies.
81.Whichofthefol
lowingar
ethecomponent
sthatcanbemachi
nedusi
ngPCM?
a)Fil
ter
sandscreens
b)Leadframes
c)Connector
sandpr obes
d)Allofthement
ioned
ViewAnswer
Answer :
d
Explanat
ion:Typi
calcomponentssuchasgaskets,
leadf
rames,
cont
act
s,connect
ors,
probes,fi
lt
ersandscreenscanbemachinedusingPCM.
82.Whatist
hecostperuni
tforl
owpr
oduct
ionv
olumesofcompl
exdesi
gnsusi
ngPCM?
a)Low
b)Medium
c)High
d)Noneofthementi
oned
ViewAnswer
Answer:a
Expl
anati
on:Relat
ivel
ylowcostperuniti
srequi
redi
nPCM,
sincet
ool
i
ngi
sinexpensi
ve
comparedtothatoftradi
ti
onal
pract
ices.
83.Stat
ewhetherthef
ollowingstat
ementi
str
ueorf
alseregar
dingadvantagesofPCM.
“I
nPCM, l
eadti
mesarelarge,whencompar
edtot
hatrequi
redforhar
dt ool
ingusi
ng
tr
adit
ionalmeans.
”
a)True
b)False
ViewAnswer
Answer :
b
Explanat
ion:
Leadti
mesar
esmal
lwhencompar
edt
othatr
equi
redbypr
ocessest
hat
requir
ehardtool
i
ng.
84.Whichofthefoll
owingfact
orscanchanget
hepar
amet
ersofet
chsuchasdept
h,
si
zeofholeetc.?
a)Timeofetch
b)Typeofetchant
c)Alloft
hement i
oned
d)Noneofthement ioned
ViewAnswer
Answer:
c
Expl
anat
ion:
Typeofet
chantusedandt
imef
oret
chi
ngcanchanget
hef
eat
uressuchas
hol
esi
zeanddept
hofet
ch.
85.Howmuchamountofbur
rispr
oduced,
whencomponent
sar
emachi
nedusi
ngPCM?
a)Small
b)Medium
c)Lar
ge
d)Noburr
ViewAnswer
Answer:d
Expl
anati
on:Phot
ochemi
cal
mil
l
ingi
sabur
r-
fr
eepr
ocessi
.e.
.,
bur
risnotpr
oducedi
n
thi
sprocess.
86.Whichofthefollowi
ngpr
oper
ti
esofmat
eri
alsar
echangedbyusi
ngPhot
ochemi
cal
mill
i
ng?
a)Hardnessofmat eri
al
b)Ducti
li
tyofmat er
ial
c)Grai
nstructur
e
d)Noneoft hement i
oned
ViewAnswer
Answer:d
Expl
anati
on:InPCM,
mat
eri
alpr
oper
ti
essuchashar
dness,
duct
il
it
yandgr
ainst
ruct
ure
arenotchanged.
87.Statewhet
herthefoll
owingst
atementi
str
ueorf
alser
egar
dingadv
ant
agesofPCM.
“Pat
ternscanbereproducedeasi
l
y.”
a)True
b)False
ViewAnswer
Answer:a
Expl
anati
on:Pat
ternscanber
epr
oducedeasi
l
ybecauset
ool
i
ngi
smadeby
phot
ographi
ctechniques.
 Unit-I
Which of the following is not used in
1 1
electromagnetic forming process?
OPTION A A capacitor bank
OPTION B A forming coil
OPTIONC A foeld shaper
OPTION D Stiffening ribs
ANSWER D

Which of the following is true about EMF process?

2 1
Intense electric field is produced using capacitors
OPTION A
and coils
Heavy current is made to flow through the
OPTION B
workpiece
Intense magnetic field is produced for few
OPTIONC
microseconds
Principle of electromagnetic induction is used to
OPTION D
pre-heat the workpiece
ANSWER C

In EMF process, eddy currents are induced in a

3 1
conductive workpiece.
OPTION A TRUE
OPTION B FALSE
OPTIONC
OPTION D
ANSWER True

In EMF process, forming pulse rate is kept as high

4 1
as possible
OPTION A True
OPTION B FALSE
OPTIONC
OPTION D
ANSWER B

For EMF process, resistivity of the workpiece

5 2
material should be _____________
OPTION A greater than 10 micro-ohm-cm
OPTION B less than 8 micro-ohm-cm
OPTIONC less than 15 micro-ohm-cm
OPTION D in the range 10-20 micro-ohm-cm
ANSWER C

6 Which of the following is not true about EMF? 1

OPTION A Leaves tool marks
OPTION B Does not require lubrication
OPTIONC Does not require any cleanup
It is primarily applied in the forming of good
OPTION D
conducting materials
ANSWER A

Springback effect of the workpiece material is

7 1
eliminated in EMF process.
OPTION A TRUE
OPTION B False
OPTIONC
OPTION D
ANSWER A

The maximum pressure applied by the

8 compression coil is approximately 2
_______________
OPTION A 300 MPa
OPTION B 340 MPa
OPTIONC 375 MPa
OPTION D 400 MPa
ANSWER B

Electromagnetic forming is rarely used to form

9 1
tubular shapes.
OPTION A True
OPTION B False
OPTIONC
OPTION D
ANSWER B

The die used in electromagnetic process should be

10 1
made of material with _________________
OPTION A high electrical conductivity
OPTION B low electical conductivity
OPTIONC low ductility
OPTION D high creep resistance
ANSWER B

The EMF process allows increased ductility

11 1
for______________ alloys.
OPTION A Chromium – molybdenum
OPTION B aluminium
OPTIONC nickel
OPTION D chromium – mangnese
ANSWER B

12 Tooling for EMF process is relatively inexpensive. 1

OPTION A True
OPTION B False
OPTIONC
OPTION D
ANSWER A

EMF is primarily used for which of the following

13 1
material?
OPTION A Silver
OPTION B High carbon steel
OPTIONC Chromium alloys
OPTION D Martensitic steel
ANSWER A

In electro-chemical grinding, grinding wheel is

14 1
used as a cathode.
OPTION A True
OPTION B False
OPTIONC
OPTION D
ANSWER B

ECG is suitable for which of the following

15 1
materials?
OPTION A Tungsten carbide
OPTION B Polymers
OPTIONC Iron
OPTION D Nickel
ANSWER A

16 In ECG, grinding action removes ____________ 2

OPTION A workpiece material from the surface
corroded surface layer making workpiece ready
OPTION B
for electro-chemical process
OPTIONC oxide film formed on the surface
particles removed from surface after chemical
OPTION D
action
ANSWER C

As compared to electrochemical machining

17 1
(ECM), ECG consumes less power.
OPTION A True
OPTION B False
OPTIONC
OPTION D
ANSWER A

18 Nozzles are used to _____________ 1

OPTION A spray coolant on the wheel
OPTION B ensure proper wetting of the wheel
OPTIONC spray chemical directly on the work piece
OPTION D nozzles are not used in ECG
ANSWER B

Electrolyte in ECG should provide _____________

19 1
OPTION A lower chemical activity
OPTION B allowance to stray currents
OPTIONC high stock removal efficiency
OPTION D higher corrosion tendency
ANSWER C

20 Which of the following is true for ECG? 2

Higher the grinding wheel rpm, higher is the
OPTION A
MRR
 Higher the current density, faster the removal rate
OPTION B
OPTIONC Stronger the electrolyte, poor surface finish
Higher the hardness of the workpiece, lower the
OPTION D
current density required
ANSWER B

21 Feed rates in ECG vary with a grinding method. 1

OPTION A True
OPTION B False
OPTIONC
OPTION D
ANSWER B

22 Which of the following is true about ECG? 1

Lower MRRs when grinding hard, heat sensitive
OPTION A
materials
Machining of soft metals like aluminium can be
OPTION B
easily done
Difficult to machine materials with high hardness
OPTIONC
like tungsten carbide
OPTION D Burr-free sharpening of needles
ANSWER D

Electro-chemical machining is opposite of

23 1
electrochemical coating.
OPTION A True
OPTION B False
OPTIONC
OPTION D
ANSWER A

For ECM of steel which is used as the electrolyte?

24 1
OPTION A Kerosene
OPTION B NaCl
OPTIONC Deionised water
OPTION D HNO3
ANSWER B
 25 MRR is ECM depends on _____________ 1
OPTION A hardness of work material
OPTION B atomic weight of work material
OPTIONC thermal conductivity of work material
OPTION D ductility of work material
ANSWER B

For which of the following ECM cannot be

26 1
undertaken?
OPTION A Steel
OPTION B Nickel based superalloy
OPTIONC Aluminium oxide
OPTION D Titanium alloy
ANSWER C

Commercial ECM is carried out at a combination

27 1
of ___________
OPTION A low voltage high current
OPTION B low current low voltage
OPTIONC high current high voltage
OPTION D high voltage only
ANSWER A

In ECM of pure iron a material removal rate of

28 600 mm3/min is required. What will be the current 1
requirement?
OPTION A 157A
OPTION B 183.6A
OPTIONC 247.8A
OPTION D 268.8A
ANSWER D

In ECM operation of pure iron an equilibrium gap

(h) of 2 mm is to be kept. What will be the supply
29 voltage (v), if the total overvoltage is 2.5 Volts. 2
The resistivity(r) of the electrolyte is 50 Ω-mm
and the set feed rate (f) is 0.25 mm/min.
OPTION A 5v
OPTION B 7.8v
OPTIONC 11.3v
OPTION D 13.2v
ANSWER D

Electrolyte used in ECM should have

30 1
_____________
OPTION A high specific heat
lower resistance to film formation on the
OPTION B
workpiece
OPTIONC higher viscosity
OPTION D corrosive nature
ANSWER A

Which of the following holds true about electro-

31 1
chemical machining?
Material is removed from the cathode and
OPTION A
deposited on the anode
Material is removed from the anode and carried
OPTION B
away by the electrolyte
Major drawback is that the finished product has
OPTIONC
residual stresses
OPTION D It can also be used for all non-metals
ANSWER A

ECM process is based on which of the following

32 1
laws?
OPTION A Coulomb’s law
OPTION B Faraday’s law
OPTIONC Law of definite proportions
OPTION D Law of chemical combination
ANSWER B

Which of the following conditions are desirable

33 1
for ECM?
OPTION A High value DC and low value electric potential
OPTION B Low value DC and high value electric potential
OPTIONC High value DC and high value electric potential
OPTION D Low value DC and low value electric potential
ANSWER A
 Which of the following conditions are desirable
34 1
for ECM?
OPTION A High value DC and low value electric potential
OPTION B Low value DC and high value electric potential
OPTIONC High value DC and high value electric potential
OPTION D Low value DC and low value electric potentia
ANSWER A

Which of the following materials can be used for

35 1
making work holding devices?
OPTION A Steel
OPTION B Rubber
OPTIONC Graphite fibres
OPTION D Wood
ANSWER C

Which of the following is true about ECM process?

36 1
OPTION A Unable to machine high strength materials
OPTION B Excessive tool wear
OPTIONC It gives burr free surface
OPTION D Surface hardness of the workpiece gets reduced
ANSWER C

Which of the following is a sludging type

37 1
electrolyte?
OPTION A NaOH solution
OPTION B KOH solution
OPTIONC NaCl solution
OPTION D CuSO4 solution
ANSWER C

Conductivity of the solution can be increased

38 1
by_____
increasing the gap between the tool and the
OPTION A
workpiece
OPTION B increasing the temperature of the solution
OPTIONC increasing the concentration of the solution
OPTION D using conductive workpiece
ANSWER C
 39 What does faraday’s second law electrolysis state? 2
W∝Q, where W= mass of substance deposited
OPTION A
and Q= charge passed through the electrolyte
w1/w2 = E1/E2, where w1 and w2 = mass of
OPTION B different substances deposited, and E1 and E2 =
their equivalent masses
OPTIONC Induced EMF = – dΦ / dt
Force between two charge particles q1 and q2, F=
OPTION D
kq1q2/r
ANSWER B

40 Solubility of the reaction products increases with_____ 1

OPTION A increase in pressure of the electrolyte
OPTION B increase in temperature of the electrolyte
OPTIONC increase in work-tool gap
OPTION D decrease in temperature of the electrolyte
ANSWER B

Composition of a Nickel superalloy is as follows:

Ni = 70.0%, Cr = 20.0%, Fe = 5.0% and rest
Titanium. What will be the rate of dissolution if
the area of the tool is 1500 mm2 and a current of
1000 A is being passed through the cell? Assume
41 dissolution to take place at lowest valency of the 2
elements.
ANi = 58.71 ρNi = 8.9 νNi = 2
ACr = 51.99 ρCr = 7.19 νCr = 2
AFe = 55.85 ρFe = 7.86 νFe = 2
ATi = 47.9 ρTi = 4.51 νTi = 3
OPTION A 2.14 cc/min
OPTION B 3.14 cc/min
OPTIONC 4.25 cc/min
OPTION D 1.66 cc/min
ANSWER A

Etching refers to the removal of material from

42 1
___________
OPTION A the soft surface
OPTION B the hard surface
OPTIONC the sticky surface
OPTION D the wafer surface
ANSWER D

Silicon dioxide etch rate at 90 °C using 30 % KOH

43 2
is approximately ______________
OPTION A 1 µm/hr
OPTION B 5 µm/hr
OPTIONC 10 µm/hr
OPTION D 100 µm/hr
ANSWER A

Why the pore characteristics of the resulting pSi

44 structures depend upon the doping type? Choose 1
the most correct option.
OPTION A Processing time depends on doping
The manufacturing process is selected on the
OPTION B
basis of doping
OPTIONC The pore formation mechanism relies on doping
Atomic size of doping atom affects the final
OPTION D
structure
ANSWER C

45 Choose the odd one out. 1

OPTION A micro-AJM
OPTION B micro-USM
OPTIONC micro-AWJM
OPTION D micro-EDM
ANSWER D

46 Choose the odd one out. 1

OPTION A micro-turning
OPTION B micro-milling
OPTIONC micro-EBM
OPTION D micro-grinding
ANSWER C

47 Choose the odd one out. 1

OPTION A EBM
OPTION B ECM
OPTIONC EDM
OPTION D LBM
ANSWER D

Holes up to _____ deep can be drilled without

48 1
using AJM process.
OPTION A 10 nm
OPTION B 45 mm
OPTIONC 66 μm
OPTION D 100 μm
ANSWER C

In which of the following process radial movement

49 1
of shaped died occur?
OPTION A Upset
OPTION B Press
OPTIONC Hubbing
OPTION D Swaging
ANSWER C

Which of the following statement is not correct

50 1
about coining process?
OPTION A It is a closed die forging process
OPTION B It is used in minting of coin, jewellery etc
OPTIONC Lubrication is not used
OPTION D All of the mentioned
ANSWER D

Which defect occurs in drop forging due to

51 1
incorrectly aligned dies?
OPTION A Miss match
OPTION B Misrun
OPTIONC Swell
OPTION D Cold shut
ANSWER A

52 Flow forming process is also known as 1

Option A control metal spinning
spinning
Option B
 micro forming
Option C
Option D hydraulic forming
Answer A

53 Shear spinning is also known as 1

Flow spinning
Option A
Spin forging
Option B
None of the above
Option C
Option D All of above
Answer D

Metal blank in strech forming process is subjected

54 1
to both plastic and Elastic deformation
Option A TRUE
Option B FALSE
Option C
Option D
Answer A

55 Stretch forming process required lubrication 1

Option A TRUE
Option B FALSE
Option C
Option D
Answer A

Laser beam is used as forming tool for following

56 1
process
Option A micro bending
micro forming
Option B
Fine blending
Option C
Option D petro forge forming
Answer A
 57 Micro bending process is applicable for 1
Stainless Steel
Option A
light alloys
Option B
none of the above
Option C
Option D all of the above
Answer D

58 Incremental sheet metal forming is also known as 1

single point forming
Option A
stretch forming
Option B
Petro forge forming
Option C
Option D micro forming
Answer A

Following method is used for production of hollow

59 1
rotational symmetry parts
Option A Shear spinning
shear streaching
Option B
flow forming
Option C
Option D none of the above
Answer A

The characteristics of Electro hydraulic forming

60 1
are similar to explosive forming
Option A TRUE
Option B FALSE
Option C
Option D
Answer A

61 Capacitor bank is used in 1

Option A electro hydraulic forming
 spinning
Option B
flow forming
Option C
Option D incremental sheet metal forming
Answer A

62 Following are techniques of explosive forming 1

standoff technique
Option A
contact technique
Option B
Option C both a and b
Option D electromagnetic technique
Answer C

63 Which one is high velocity forming process 1

Option A electromagnetic forming
explosive forming
Option B
spinning
Option C
Option D flow forming
Answer A

64 Which of the following metal forming processes 1

performs squeezing out of material through a hole?
Option A Forging
Option B Rolling
Option C Drawing
Option D Extrusion
Answer D

Which of the following processes is not the type of

65 1
bulk forming process in the metal forming?
Option A Bending
Option B Rolling
Option C Forging
Option D Extrusion
 Answer A

Which of the following manufacturing processes is

66 mainly considered for producing the components 1
of very high strength?
Option A Casting
Option B Forging
Option C Extrusion
Option D Rolling
Answer B

Which of the following metal forming processes

67 1
is best suitable for making the wires?
Option A Forging
Option B Extrusion
Option C Drawing
Option D Rolling
Answer C

Depending upon the temperature the forming

68 1
process can be classified as?
Option A Hot working
Option B Cold working
Option C Warm working
Option D All of the mentioned
Answer D

In which of the following process no strain

69 1
hardening is produced?
Option A Hot working
Option B Cold working
Option C Warm working
Option D Cannot say
Answer A

During hot working, the grain growth can take

70 1
place in which part of the material?
Option A Exterior
Option B Interior
Option C c) Along the edges
Option D d) Side faces
Answer B

The working temperature of cold working is below

71 a certain temperature. That temperature is known 1
as?
Option A Critical temperature
Option B Recrystallization temperature
Option C Transition temperature
Option D Curie temperature
Answer B

In which of the following process the ductility of

72 1
material decreases?
Option A Hot working
Option B Cold working
Option C Warm working
Option D Cannot say
Answer B

In which of the following process plastic

73 1
deformation takes place?
Option A Cold working
Option B Hot working
Option C Both cold working and hot working
Option D Cannot say
Answer C

The work involved with the internal shearing

74 1
process due to non-uniform deformation is
Option A Ideal work
Option B Frictional work
Option C Redundant work
Option D Slip work
Answer C

75 1
Which process got a better dimensional accuracy?
Option A Hot working
Option B Cold working
Option C Warm working
Option D Both Hot working and Cold working
Answer A

Which of the following is appropriate

76 characteristics or application for electromagnetic 2
forming process
Option A one female die is needed
Option B Magnetic pulse forming
Option C Roller with automated controllrd movement
Option D flower design
Answer B

Which of the following is appropriate

77 characteristics or application for Flow Forming 2
process
Option A Flower design
Option B pivoted pointer
Option C Roller with automated controlled movement s
Option D Vacuum in die is prerequisite
Answer C

Which of the following is appropriate

78 characteristics or application for Electro Hydro 2
forming process
Option A Capacitor Bank
Option B pivoted pointer
Option C only female die is needed
Option D Hemispherical, hemi ellipsoidal profile forming
Answer A

Which of the following is appropriate

79 characteristics or application for Roll Forming 2
process
Option A magnetic pulse forming
Option B Flower Design
Option C radiator forms
Option D pivoted pointer
Answer B
 Which of the following is appropriate
80 characteristics or application for shear spinning 2
process
Option A Roller with Automated controlled movements
Option B only female die is needed
Option C vacuum in the die is prerequisite
Option D Hemispherical, hemi ellipsoidal profile forming
Answer D

Which of the following is appropriate

81 characteristics or application for High Energy rate 2
forming process
Option A Only Female die is needed
Option B magnetic pulse forming
Option C pivoted pointer
Option D flower Design
Answer A

Which of the following is appropriate

82 characteristics or application for Explosive 2
forming process
Option A pivoted pointer
Option B magnetic pulse forming
Option C flower design
Option D Vacuum in die is prerequisite
Answer D

Which of the following is appropriate

83 2
characteristics or application for Spinning process
Option A use of eddy current
Option B capacitor bank
Option C magnetic pulse forming
Option D pivoted pointer
Answer D

84 Application of HERF process is 2

Option A Radar dishes
Option B crimping of metal strips
Option C forming of elliptical dome for space application
Option D All of the above
Answer D

85 Application of magnetic pulse forming process 2

Option A compression crimp sealing
Option B Dent repairing
Option C automotive and aerospace industry
Option D All of the above
Answer D

Ratio of diameter of blank to diameter of mandrel

86 2
is defined as
Option A feed ratio
Option B spinning ratio
Option C spindle speed
Option D None of the above
Answer B

Which of the following is an advantage of HERF

87 2
process
Option A Die costs are relatively low
Option B large components can be easily deformed quickly
Option C Both A &B
Option D None of the above
Answer C

In HREF high energy is applied for __________

88 2
interval of time.
Option A Short
Option B Long
Option C Medium
Option D None of the above
Answer A
 The following Image related to ___________
forming processes.

89 2

Option A Roll
Option B Electro Hydraulic
Option C explosive
Option D petro-forge
Answer C

In uncofined type explosive forming the _______

is necessary in the die to prevent adiabatic heating
90 1
of the work which may lead to oxidation or
melting.
Option A water
Option B air
Option C vacuum
Option D explosive
Answer
Unit-II
In electron beam welding the lower thickness
1 1
welding voltage is between
OPTION A 5 to 30 Kv
OPTION B 15 to 30 kv
OPTIONC 40 to 50 kv
OPTION D 70 to 150 kv
ANSWER A

In electron beam welding the higher thickness

2 1
welding voltage is between
OPTION A 30 to 60 kv
OPTION B 70 to 150 kv
OPTIONC 80 to 160
OPTION D 90 to 180 kv
ANSWER B

3 In EBW the required pressure is between 1

OPTION A 0.1 to 10 Pa
OPTION B 0.1 to 20 Pa
OPTIONC 0.1 to 30 Pa
OPTION D 0.1 to 50 Pa
ANSWER A

In thermal spray coating (metallic or nonmetallic)

4 1
powder is used
OPTION A Correct
OPTION B Incorrect
OPTIONC
OPTION D
ANSWER A

In cryogenic welding material is processed under

5 1
temperature
OPTION A -50
OPTION B -150
OPTIONC -1500
OPTION D -15000
ANSWER B

6 In extrusion welding thermoplastics are welded 1

OPTION A TRUE
OPTION B FALSE
OPTIONC
OPTION D
ANSWER A

The process utilizing mainly thermal energy for

7 1
removing material is
OPTION A Ultrasonic machning
OPTION B ElectroChemical Macining
OPTIONC Abrasive jet macining
OPTION D Laser Beam Machining
ANSWER D

In LBM Gases used are, 1.helium neon 2.argon

8 1
3.Co2
OPTION A 1 only
OPTION B 1 and 2
OPTIONC 2 and 3
OPTION D all of these
ANSWER D

Which one of the following consists minimum

9 1
HAZ
OPTION A Shield Metal arc welding
OPTION B laser beam welding
OPTIONC ultrasonic welding
OPTION D metal inhert gas welding
ANSWER B

In Heat Affected Zone, The area undergoes plastic

10 1
deformation
OPTION A TRUE
OPTION B FALSE
OPTIONC
OPTION D
ANSWER A

11 In ultrasonic welding the power supplied is 1

OPTION A 50-120 V
OPTION B 120-240 V
OPTIONC 240-500V
OPTION D 500-1000
ANSWER B

In ultrasonic welding the frequency range is

12 1
between
OPTION A 15-40hz
OPTION B 20-60hz
OPTIONC 30-80hz
OPTION D 50-100hz
ANSWER A
 13 In adhesive bonding the filler material used is 1
OPTION A metallic
OPTION B non-metallic
OPTIONC plastic
OPTION D None of these
ANSWER B

14 Adhesive joints are stronger than welded joints 1

OPTION A TRUE
OPTION B FALSE
OPTIONC
OPTION D
ANSWER B

15 In Explosive welding, explosion is carried by 1

OPTION A Pentaery thritolt tetranitrate
OPTION B Trinitrotoluene
OPTIONC Both
OPTION D None of these
ANSWER c

16 In Friction Stir Welding 1

OPTION A No heat is added to system
OPTION B heat is generated internally
OPTIONC non ferrous materials are welded
OPTION D all of these
ANSWER D

17 FSW has temperature range of 425 to 5000C 1

OPTION A TRUE
OPTION B FALSE
OPTIONC
OPTION D
ANSWER A

18 Heat generation in FSW process 1

OPTION A increases with increasing tool rotation speed
OPTION B Decreases with increasing tool rotation speed
OPTIONC Increases with decreasing tool rotation speed
OPTION D Increases with descreasing tool rotation speed
ANSWER A

19 In ultrasonic welding power supply have 1

OPTION A low frequency
OPTION B medium frequency
OPTIONC high frequency
OPTION D zero frequency
ANSWER C

Which one of the following is used for offshore

20 1
welding
OPTION A Friction Stir Welding
OPTION B Under Water Welding
OPTIONC Laser Beam Welding
OPTION D Thermal Spray Coating
ANSWER B

21 Spraying with detonation gun uses Gas as fuel 1

OPTION A TRUE
OPTION B FALSE
OPTIONC
OPTION D
ANSWER A

Spraying with detonation gun is held at a distance

22 1
of
OPTION A 10-50mm
OPTION B 50-100mm
OPTIONC 100-150mm
OPTION D 50-200mm
ANSWER D

In Spraying with detonation gun the powder

23 1
particle size is
OPTION A 10-20micron
OPTION B 10-30micron
OPTIONC 10-40micron
OPTION D 10-50micron
ANSWER D
 Which of the following is a type of External
24 1
Heating
OPTION A hot gas welding
OPTION B extrusion welding
OPTIONC hot plate welding
OPTION D all of these
ANSWER D

In friction stir Welding for plastics the vibration

25 1
frequency is
OPTION A 50-150hz
OPTION B 50-200hz
OPTIONC 100-240hz
OPTION D 100-300hz
ANSWER C

Explosive welding has high velocity of (14750-

26 1
25000 ft/s)
OPTION A TRUE
OPTION B FALSE
OPTIONC
OPTION D
ANSWER A

27 In FSW -------- type of rotating tool is used 1

OPTION A consumable
OPTION B non-consumable
OPTIONC
OPTION D
ANSWER B

28 In FSW Movement of material produces joint 1

OPTION A TRUE
OPTION B FALSE
OPTIONC
OPTION D
ANSWER A

29 FSW tool material is subjected to 1

OPTION A low value of stresses
OPTION B medium value of stresses
OPTIONC high value of stresses
OPTION D zero value of stresses
ANSWER C

Recrystallisation takes place during Weld Nugget

30 1
Zone
OPTION A The Statement is correct
OPTION B The Statement is incorrect
OPTIONC Can't determine
OPTION D Non of these
ANSWER A

Which one of the following is NOT a solid state

31 2
welding process
OPTION A Friction Stir Welding
OPTION B ultrasonic welding
OPTIONC gas tungsten arc welding
OPTION D explosive welding
ANSWER C

Out of the given process parameters below, which

32 one of the following is NOT relevant to ultrasonic 2
welding
OPTION A Clamping force
OPTION B welding time
OPTIONC Frequency
OPTION D Tool rotation
ANSWER D

Why is friction stir welding known as green

33 2
technology
OPTION A It uses green colored tool
due to its energy efficiency and environment
OPTION B
friendliness
OPTIONC Due to its process efficiency
OPTION D It can be used to join dissimilar materials
ANSWER B
 Which material cannot be weld using friction stir
34 2
welding process
OPTION A steel
OPTION B aluminium
OPTIONC magnesium
OPTION D gold
ANSWER D

35 What is the range of sonic velocity of metals 2

OPTION A 1000-2000 m/s
OPTION B 2000-6000 m/s
OPTIONC 9000-10000 m/s
OPTION D 0-500 m/s
ANSWER B

Which one of the following is not a part of

36 2
Ultrasoni welding system
OPTION A anvil
OPTION B transducer
OPTIONC booster
OPTION D welding torch
ANSWER D

Which one of the following options is not true

37 2
about friction stir welding
OPTION A fine microstructure is produced
good dimensional stability and repeatability is
OPTION B
obtained
OPTIONC absence of crack in welds
OPTION D shielding gas is used
ANSWER D

Wedge reed system is relevant to which one of the

38 2
solid state welding process
OPTION A ultrasonic welding
OPTION B diffusion welding
OPTIONC cold welding
OPTION D friction welding
ANSWER A

In friction stir welding, the following metallurgical

zones are produced: A-preheating zone, B-forging
39 zone,C-extrusion Zone,D-cool down zone and E- 2
initial deformation zone . Arrange in correct order

OPTION A D-E-C-B-A
OPTION B D-C-E-A-B
OPTIONC A-E-C-B-D
OPTION D A-B-C-D-E
ANSWER C

Which of the following statement are true for

ultrasonic welding 1.Productivity is high, 2.thin
40 2
pieces can be welded, 3. post cleaning of weld is
necessary, 4. preparation required is less
OPTION A 1,2&4
OPTION B 2,3&4
OPTIONC 1,3&5
OPTION D 1,2&5
ANSWER D

In ultrasonic welding, the frequency range is

41 2
generally
OPTION A 100-4000cps
OPTION B 4000-20000cps
OPTIONC 20000-40000cps
OPTION D 80000-200000cps
ANSWER C

Which one of the following does not hold true

42 2
about laser beam welding
it cannot be used in case of joints at intricate
OPTION A
locations
OPTION B it can produce tiny welds
OPTIONC it can be used for a variety of metal combinations
in LBW, thin welds on small diameter wires are
OPTION D
less suspectable to burn back
ANSWER A
 43 Laser welds are not influenced by 2
OPTION A electric field
OPTION B magnetic field
OPTIONC radio waves
OPTION D ultraviolent rays
ANSWER B

Aspect Ratio, i.e depth to width ratios of the order

44 2
of-----are attainable by LBW
OPTION A 1:02
OPTION B 5:10
OPTIONC 10:01
OPTION D 15:01
ANSWER C

weld penetrations of larger than-----are difficult to

45 2
weld by LBW
OPTION A 5mm
OPTION B 13mm
OPTIONC 19mm
OPTION D 25mm
ANSWER C

Which of the following material properties has no

46 2
effect on Laser Beam Machining
OPTION A Reflectivity
OPTION B Thermal conductivity
OPTIONC Weldability
OPTION D Electrical conductivity
ANSWER D

Laser Tends to have fairly low energy conversion

47 2
efficiency
OPTION A TRUE
OPTION B FALSE
OPTIONC
OPTION D
ANSWER A
 Arrange the following welding processes in the
order of decreasing power density 1. Laser Beam
48 2
Welding 2. Electron Beam Welding 3. Gas Metal
Arc Welding
OPTION A 1>3>2
OPTION B 3>1>2
OPTIONC 1>2>3
OPTION D 2>1>3
ANSWER C

Which one of the following Statement is not true

49 2
about Adhesive Bonding
Larger molecules cause better adhesion, hence
OPTION A
organic adhesives are commonly used
the liquid adhesive is used to wet the surface to be
OPTION B
bonded
OPTIONC curing is not possible at relative low temperature
It relies on attractive forces between the molecules
OPTION D at the surfaces of the adhesive and the surface to
be joined
ANSWER C

The bonding mechanism "Interfacial Morphology"

50 is uique characteristics of which Solid State 2
Welding Process
OPTION A explosive welding
OPTION B diffusion welding
OPTIONC cold welding
OPTION D friction welding
ANSWER A
 Unit-III
1 A thin metallic wire used in wire-cut EDM is kept submerged in a tank of _____ 1
Option A dielectric fluid
Option B pure water
Option C molten metal
Option D kerosene
Answer A

2 In the wire-cut EDM process, de-ionizing units are used for controlling the _____ 1
Option A feed rate
Option B resistivity
Option C burr formation
Option D temperature of the wire
Answer B

3
Electrically conductive materials are cut by WEDM process by _____ mechanism. 1
Option A thermal
Option B electro-thermal
Option C electro-dynamic
Option D fused metal
Answer B

In wire-cut EDM process, material removal takes place by a series of discrete

4
discharges between _____ 1
Option A di-electric fluid and the wire electrode
Option B the wire-electrode and the workpiece
Option C the workpiece and the CNC-table
Option D wire electrodes
Answer B

5 For which of the following materials wire-cut EDM is not used? 1

Option A Aluminium
Option B Zirconium
Option C Steels
Option D Titanium
Answer B

6 In wire-cut EDM, a moving wire is used to ____ 1

Option A remove the burr
Option B cut complex outlines
Option C melt the material
Option D make the way for the di-electric fluid
Answer B

7
Wire electric discharge (E machining is based on the same principle as that of _____ 1
Option A hydro-dynamic EDM
Option B die-sink EDM
Option C polar EDM
Option D non-conventional EDM
Answer B

8 Which of the following is true for ECG? 1

Option A Higher the grinding wheel rpm, higher is the MRR
Option B Higher the current density, faster the removal rate
Option C Stronger the electrolyte, poor surface finish
Option D Higher the hardness of the workpiece, lower the current density required
Answer B

9 In electrochemical grinding, the pieces from the workpiece 1

Option A Are dissolved into the conductive fluid
Option B Melts and vaporizes
Option C Flushed out
Option D None of the above
Answer A

10 What are all the types of materials, which can be machined using AWJM? 1
Option A Glass
Option B Ceramics
Option C Concrete
Option D All of the mentioned
Answer D

11 What is the percentage of the abrasives and water in the mixture 1

Option A 20% water and 80% abrasives
Option B 80% water and 20% abrasives
Option C 30% water and 70% abrasives
Option D 70% water and 30% abrasives
Answer D

12 How is the material removed in Abrasive water jet machining? 1

Option A Vaporization
Option B Electron transfer
Option C Corrosion
Option D Erosion
Answer D

13
Which of the following is not a process parameter of Abrasive water jet machining 1
Option A Frequency of vibration
Option B Orifice diameter
Option C Pressure
Option D Stand-off distance
Answer A

14 Material is removed on which basis, in Shaped tube electrolytic machining? 1

Option A Dissolution
Option B Vaporization
Option C Abrasion
Option D Erosion
Answer A

15 What is the percentage of electrolyte dissolved in water? 1

Option A 1 – 5%
Option B 10 – 25%
Option C 40 – 70%
Option D 75 – 90%
Answer B

16 In Magnetic abrasive finishing, which of the following particles do not contribute to the m 1
Option A Abrasive particles
Option B Magnetic particles
Option C Non-magnetic particles
Option D All of the mentioned
Answer C

17 The term "dressing" in grinding means 1

Option A creating the profile of griending wheel
Option B producing oxide layer
Option C producing sufficient grit protrusion on the griending wheel
Option D determining out of balance force
Answer C

18 The in-process dressing provides 1

Option A uninterrupted griending
Option B producing good surface finish
Option C dressing the wheel inside the machine
Option D stimulating electrolysis
Answer A

19
A small gap between the grinding wheel and the electrode should be maintained 1
Option A to avoid electrical contact
Option B to avoid direct contact
Option C to avoid removal of oxide layer
Option D to pass an adequate flow of electrolyte
Answer D

20 In the ELPD current duty ratio is the ratio of 1

Option A pluse on-time to period
Option B pluse on-time to pluse off-time
Option C ratio of current and voltage
Option D pluse on-off time to period
Answer A

STEM process is used in aerospace industries to drill the holes with high length to
21
diameter ratio up to_____ 1
Option A 200:1
Option B 100:1
Option C 150:1
Option D 300:1
Answer D

Generally in STEM process acid based electrolyte such as sulphuric acid having
22
______ % concentrationin water. 1
Option A 50
Option B 20
Option C 10
Option D 5
Answer C

23 In STEM process how much low voltage applied across the gap as higher voltage
causes boiling of electrolyte which eventually damages the electrode coating. 2
Option A 5-15 V DC
Option B 10-20 V DC
Option C 1-5 v DC
Option D 20-35 v DC
Answer A

24
Using STEM process Small holes in diameter with high length to diameter ratio 2
Option A 0.76-1.62 mm
Option B 1.2 - 2.4mm
Option C 0.05 - 0.225mm
Option D 0.95-3.32 mm
Answer A

25 Which material is used as a tool for STEM to resist acid attack by electrolyte. 2
Option A Tungsten
Option B Aluminium
Option C Copper
Option D Titanium
Answer D

26 During the STEM process the tool feed rate is around 2

Option A 0.75-3
Option B 2-5.5
Option C 4-8
Option D 0.15-0.75
Answer A

Amongs all these which of the material is not used commonly as bonding material in
27
Electrochemical Grinding. 2
Option A Copper
Option B Cobalt
Option C Brass
Option D Nickel
Answer B

A constant inter-electrode gap is maintained considering the grain size of the

28
abrasive particle. 2
Option A 0.025mm
Option B 0.5mm
Option C 1mm
Option D 1-1.5mm
Answer A

29 In ECG the size of abrasive particle around grit number. 2

Option A 120-800
Option B 60-320
Option C 500-1200
Option D 100-1600
Answer B

30 ______ has significant effect on surface finish and material removal rate. 2
Option A Current density
Option B Air gap
Option C Flow of electrolyte
Option D Feed
Answer A

31 The surface finish obtained in ECG is______ µm. 2

Option A 0.01-0.05
Option B 0.1-0.5
Option C 0.12-0.8
Option D 0.8-1.2
Answer C

32 Electrolyte in ECG should provide______ 2

Option A lower chemical activity
Option B allowance to stray currents
Option C high stock removal efficiency
Option D higher corrosion tendency
Answer C

33 Which of the following is true about ECG? 2

Option A Lower MRRs when grinding hard, heat sensitive materials
Option B Machining of soft metals like aluminium can be easily done
Option C Difficult to machine materials with high hardness like tungsten carbide
Option D Burr-free sharpening of needles
Answer D

34 MRR is ECM depends on_______ 2

Option A hardness of work material
Option B atomic weight of work material
Option C thermal conductivity of work material
Option D ductility of work material
Answer B

In EJM a higher voltage of_____ V is applied get longer and thinner flow of electrolyte
35
. 2
Option A 50-100
Option B 150-750
Option C 200-400
Option D 600-1000
Answer B

36 Laser Beam is produced due to_______ 2

Option A spontaneous emission
Option B stimulated emission followed by spontaneous emission
Option C spontaneous emission followed by Spontaneous absorption
spontaneous absorption leading to “population inversion” and followed by stimulated
Option D
emission
Answer D

37 In Abrasive flow finishing the viscoelastic medium is consisting of ____ 2

Option A SiC
Option B Al2O3
Option C Boron Carbide
Option D all of These
Answer D

In which process mechanical energy of water use and abrasive phase is use to
38
achieve material removal or machining. 2
Option A AFF
Option B ECG
Option C AWJM
Option D FMAB
Answer C
 In AWJM hydraulic intensifier increases water pressure of bar to about 3000-4000
39
bars. 2
Option A 4
Option B 16
Option C 24
Option D 10
Answer A

40 Wire-cut EDM can cut plates of thickness upto ____ 2

Option A 50mm
Option B 100mm
Option C 300mm
Option D 500mm
Answer C

41
Which of the following component of the wire cut EDM machine does not get heated? 2
Option A Workpiece
Option B Electrode wire
Option C Di-electric fluid
Option D Coils
Answer B

42 The electrode wires are usually made form_____ 2

Option A graphite
Option B iron
Option C nickel
Option D brass
Answer D

43 For machining of high melting point materials, ________ wires are used 2
Option A gallium
Option B zinc coated
Option C aluminium coated
Option D silver
Answer B

44 Which process combines principle of EDM and ECM processes 2

Option A STEM
Option B AFF
Option C ECDM
Option D WEDM
Answer C

45 ECDM uses _______ welding copper plates and foils. 2

Option A micro electro seam
Option B one of two electrode
Option C current
Option D Electrolyte concentration
Answer A
Unit-IV
1 Tool in USM is generally made from which of the following materials? 1
Option A Glass
Option B Ceramic
Option C Carbides
Option D Steel
Answer D

2
Micro Machining has ability to produce features with the diamentions as small as ___ 1
Option A 1nm to 999nm
Option B 1µm to 999µm
Option C 1mm to 100mm
Option D 100µm to 9999µm
Answer B

3 Lithography based micro machining technology uses _____ as materials. 1
Option A Steel
Option B Lithium
Option C Carbides
Option D Silicon
Answer D

4 Diamond Micro Machining uses diamond as a cutting tool material because _____ 1
Option A Diamond has a high coefficient of friction
Option B Diamond has low hot hardness
Option C
Diamond has a crystalline structure which allows to produce a very sharp cutting edges.
Option D None of the above
Answer C

5 Ion implantation is a technique to do what? 1
Option A Dope a semiconductor. 
Option B Deposit an insulating layer on a semiconductor
Option C Deposit a metallic layer on a semiconductor.
Option D Deposit an insulating layer on an insulator.
Answer A

6 What is “lithography” used for in semiconductor manufacturing? 1
Option A To dope semiconductors.
Option B To deposit amorphous films on semiconductors
Option C To deposit polycrystalline films on semiconductors.
Option D To produce patterns in the films deposited on semiconductors
Answer D
 7 What is the most common insulator used in silicon manufacturing? 1
Option A Si3N4
Option B Al2O3
Option C Si02
Option D HfO2
Answer C

8 Which of the following statements is true about the magnitude of the electric field in 
the transition region of an NP junction? 1
Option A It is constant in space
Option B  It increases linearly from the N side to the P‐side.
Option C  It decreases linearly from the N side to the P‐side
Option D  It first increases linearly, reaches a peak at the junc on, then decreases linearly.
Answer D

9 Ultrasonic Micro Machining suitable for the micro machining of ______ 1
Option A Soft and brittle material
Option B Hard and brittle material
Option C Hard and ductile material
Option D None of the above
Answer B

10 Ultrasonic Micro Machining (USM) is done under what frequency?  1
Option A 5—10 Hz
Option B 5k—10 kHz
Option C 20—40 Hz
Option D 20k—40kHz
Answer D

11
What is the purpose of the softbake after resist application into the photolithography? 1
Option A To remove residual solvent from the resist layer
Option B To correct minor uniformity problems with the resist
Option C To harden the resist for the expose process step
Option D To harden the resist for the etch process step
Answer A

After the coated wafer is placed into the photolithography expose equipment, it is _______ 
12
prior to being exposed.  1
Option A Baked
Option B Cooled
Option C Aligned
Option D Coated
Answer C
 During the coating of photoresist, the thickness of the photoresist __________________ with 
13 an
increase in spin speed. 1
Option A Increases exponentially
Option B Decrease exponentially
Option C Increase linearly
Option D Decreases linearly
Answer B

14 Which of the following material is not generally machined by USM? 1
Option A Copper
Option B Glass
Option C Silicon
Option D Germanium
Answer A

15 Which of the following BEST describes the photolithography process? 1
Option A
The process step that transfers a pattern into an underlying layer or the substrate’s bulk
Option B
The process step that defines and transfers a pattern into a resist layer on the wafer
Option C The process step that deposits a resist layer on the surface of the wafer.
Option D
The process step that aligns the various layers of a microsystem device to each other
Answer B

16 Which of the following are the components of Ion beam machining? 1
Option A Vacuum chamber
Option B Voltage source
Option C Tungsten filament cathode
Option D All of the mentioned
Answer D

17 Machining rates in IBM depend on which of the following factors? 1
Option A Work piece material
Option B Ions type
Option C Incident angle
Option D All of the mentioned
Answer D

18 What is the value of voltage required for machining in Ion beam machining? 1
Option A 1 kV
Option B 2 kV
Option C 3 kV
Option D 4 kV
Answer A
 19 What is the value of beam diameter that is obtained in IBM? 1
Option A 1 cm
Option B 3 cm
Option C 5 cm
Option D 7 cm
Answer C

20 Which of the following materials can be textured using the IBM process? 1
Option A Copper
Option B Nickel
Option C Stainless steel
Option D All of the mentioned
Answer D

21 Which of the following are the applications of IBM? 2
Option A Smoothing laser mirrors
Option B Polishing surfaces
Option C Shaping surface
Option D All of the mentioned
Answer D

22 What are the accuracy levels that are obtained by using IBM? 2
Option A ± 1.0%
Option B ± 2.0%
Option C ± 3.0%
Option D ± 4.0%
Answer A

23 What are the dimensions that can machined on IBM? 2
Option A 0.1 to 1 nm
Option B 1 to 10 nm
Option C 10 to 100 nm
Option D 100 to 1000 nm
Answer C

In this method, which of the following techniques are used to apply the maskant on the 
24
machining surface? 2
Option A Photographic techniques
Option B Cut and peel masking
Option C Silkscreen resist technique
Option D None of the mentioned
Answer A

25 What are the values of current densities required in IBM? 2
Option A  0.25 mA/cm2
Option B  0.35 mA/cm2
Option C  0.55 mA/cm2
Option D  0.85 mA/cm2
Answer D

26 In ultrasonic machining, the abrasive particles act as the __________ 2
Option A chip carriers
Option B intenders
Option C finishing particles
Option D thickening agent for the slurry
Answer B

27 Which of the following is the first step in Photo chemical milling process? 2
Option A Generation of photographic film
Option B Etching the part
Option C Removal of etchant
Option D Photo resist stripping
Answer A

28
Which of the following processes does not come under Chemical machining processes? 2
Option A Chemical milling
Option B Photo forming
Option C Photo chemical filling
Option D Photo chemical blanking
Answer B

29 Which of the following is the first step in Photo chemical milling process? 2
Option A Generation of photographic film
Option B Etching the part
Option C Removal of etchant
Option D Photo resist stripping
Answer A

In case of photochemical milling that use using lettering and graphics for surface etching, 
30
what will be the depth of surface etched? 2
Option A Very deep
Option B Up to certain depth
Option C Half‐way
Option D None of the mentioned
Answer B

31 In some cases, Photochemical milling can also be called as? 2
Option A Photo chemical blasting
Option B Photo chemical blanking
Option C Photo chemical drilling
Option D Photo chemical erosion
Answer B

32 In USM, material removal may occur due to ______ 2
Option A fatigue failure
Option B fouling failure
Option C free flowing impact of the abrasive
Option D creep
Answer C

33 Which of the following materials is not used as abrasive in ultrasonic machining? 2
Option A SiC
Option B Boronsilicarbide
Option C Diamond
Option D TiC
Answer D

34 Which of the following is not the component of USM machine? 2
Option A Slurry delivery
Option B Transducer
Option C Concentrator
Option D Lead screw
Answer D

35 Which of the following is not machined by USM? 2
Option A Brittle metals
Option B Glass
Option C Ceramics
Option D Ductile materials
Answer D

36 USM machine uses _____ axis table. 2
Option A single
Option B 2
Option C 3
Option D 5
Answer B

37 USM is a material removal process used to_____ material. 2
Option A corrode
Option B erode
Option C melt
Option D form
Answer B

38 Which of the following is true about USM 2
Option A There is direct contact between the tool and the workpiece
Option B There is no direct contact between the tool and the workpiece
Option C This process is not suitable for machining of brittle materials
Option D This process consumes very less power
Answer B

39  During USM __________ is converted into mechanical vibrations. 2
Option A pressure energy of the slurry
Option B electrical energy
Option C chemical energy of the chemical used for the slurry
Option D mechanical energy of the tool
Answer B

40 Which of the following pumps is used in USM? 2
Option A Re‐circulating pump
Option B Centrifugal pump
Option C Vane pump
Option D Reciprocating pump
Answer A
 Unit-V
Question No. Question Marks
Additive manufacturing of a design, often iterative, for form, fit, or functional
1 1
testing.This statement related to which?
Option A Bio-printing
Option B Forming Advantages
Option C Material Extrusion
Option D rapid prototyping
Answer D

2 What is additive manufacturing? 1

Process by which 3D objects are constructed by successively depositing material in
Option A
layers
Process by which 3D objects are constructed by successively cutting material away
Option B
from a solid block of material
Answer A

3 Liquid photopolymer cured by light-activated polymerisation i.e.________ 1

Option A Powder bed fusion
Option B Vat Polymerisation
Option C lithography
Option D stereolithography (SL)
Answer B

4 Which one is NOT related to rapid prototyping definition? 1

Option A ayer by layer
Option B physical model
Option C production line
Option D from 3D CAD data
Answer C

5 Which one of the process is NOT using laser? 1

Option A LOM
Option B SLA
Option C SLS
Option D FDM
Answer D

6 Which of the following are the process in RP cycle? 1

Option A Post-processing
Option B Transfer to machine
Option C Pre-processing
Option D All of the answers
Answer D
7 What is the full name of SLS? 1
Option A Selective Laser Simulator
Option B Sintering Laser Simulator
Option C Selective Laser Sintering
Option D Stereolithography Laser Sintering
Answer C

8 What are the other name of Multi Jet Modeling? 1

Option A FDM
Option B Poly Jet
Option C 3D Printer
Option D Extrusion
Answer B

9 What is the format for prototyping machine file? 1

Option A .prt
Option B .slt
Option C .stl
Option D .iges
Answer C

10 Which one of the process is subtractive prototyping? 1

Option A 5 axis CNC Milling
Option B Fused Deposition Modeling
Option C Multi Jet Modeling
Option D Stereolithography Apparatus
Answer A

11 Which of the process is using extrusion concept? 1

Option A SLA
Option B SLS
Option C FDM
Option D MJM
Answer C

12 3D printing includes what materials? 1

Option A Plastic
Option B Nylon
Option C Glass
Option D All of the Above
Answer D

What's the term used to describe 3-D printing when it's used to create models for
13 1
testing a product's design?
Option A Rapid Prototyping (RP)
Option B Computer Aided Design (CAD)
Option C Fused Deposition Modelling (FDM)
Option D None of These Above
Answer A

14 What filament type does the Makerbot 5th Gen, MakerBot Mini & Lulzbot use? 1
Option A PLA
Option B ABS
Option C FX
Option D STL
Answer A

15 In powder metallurgy, how is the powder for brittle materials prepared? 1

Option A a) Pulverization
Option B b) Atomization
Option C c) Electrolysis
Option D d) Fusion
Answer A

16 Sintering is performed ___________ 1

Option A a) At room temperature
Option B b) Below melting point
Option C c) Above boiling point
Option D d) At cryogenic temperatur
Answer B

17 Additive manufacturing processes are categarized by _______categeries 1

Option A 5
Option B 6
Option C 7
Option D 8
Answer C

18 material is selectively dispensed through a nozzle or orifice"_______" 1

Option A Powder bed fusion
Option B Extrusion
Option C Materials Used in AM
Option D material extrusion
Answer D

19 Vat Polymerization also known as.. 1

Option A sintering
Option B material jetting
Option C Powder Bed Fusion
Option D none of these
Answer D
20 liquid bonding agent is selectively deposited to join powder materials 1
Option A binder jetting
Option B Rapid Tooling
Option C Powder bed fusion
Option D marketbot print
Answer A

21 What is the disadvantage of sheet lamination process? 1

Option A A paper based system can absorb moisture therefore coating is necessary.
Option B Along Z axis the dimension control is difficult.
Option C Used glue can affect the thermal and mechanical properties of the final part
Option D All of these
Answer D

In which of the following additive manufacturing process in which focused thermal

22
energy is used to fuse materials by melting as they are being deposited? 1
Option A Material Jetting
Option B Direct Energy Deposition
Option C Electron Energy Deposition
Option D Electrical Energy Deposition
Answer B

23 Which technology is used in Binder Jetting? 1

Option A Drop on Demand
Option B 3D Printing
Option C Polyjet
Option D Monojet
Answer B

24 What is advantage of Vat photopolymerization? 1

Option A Can be used for small object as well as large part
Option B The process is relatively expensive
Option C Limited material use of photo-resin
Option D Lengthy post processing time and removal from resin
Answer A

25 Which of the following material is used in the Material Jetting? 1

Option A Titanium alloys
Option B Thermoplastics
Option C Wax
Option D Ceramic powder
Answer C

Which of the following is not the application of Additive Manufacturing in medical

26
field? 1
Option A Tissue and Organ priniting
Option B Models for Surgery preparation
Option C Patient specific implants and prostheses
Option D none of these
Answer D

27 The most common material used in PBF processing is _________? 1

Option A nylon polyamide
Option B Silicon polyamide
Option C zinc polyamide
Option D none of these
Answer A

28 Which of the following technology is used for Powder Bed Fusion? 1

Option A Fused Deposition Modeling
Option B Selective Laser Sintering
Option C Laminated Object Manufacturing
Option D 3D Printing
Answer B

29 Most of the laser based PBF systems have low build rates of _____? 1
Option A 5-30 cm3
Option B 5-25cm3
Option C 5-20 cm3
Option D 5-15 cm3
Answer C

In preheating stage, a high current

30 beam with a high scanning speed is used to preheat the powder 1
layer up to_______ in multiple passes
Option A (0.6 - 0.7T m)
Option B (0.6- 0.8 T m)
Option C (0.4 - 0.8T m)
Option D (0.4 - 0.6 T m)
Answer D

The LOM process uses a _________ method during the printing process to allow for
31 1
easy removal post build
Option A Slide hatching
Option B Over hatching
Option C Cross hatching
Option D None of these
Answer C

What is the paper sheet thickness of Gluing or adhesive bonding method by using Laminated 
32 1
Object Manufacturing ?
Option A 70 to 200 µm
Option B 71 to 200 µm
Option C 72 to 200 µm
Option D 73 to 200 µm
Answer A

33 Which of the following is the advantage of Binder jetting? 1

Option A Not always suitable for structural parts
Option B The process is faster as compared to other processes
Option C Additional post processing can add significant time
Option D None of these
Answer B

34 Direct Energy Deposition processes show accuracy around_______microns? 1

Option A equal to 1
Option B Less
Option C More
Option D Few
Answer D

In Solid state sintering , Long sintering time and elevated temperature will result in to
35 1
_______porosity?
Option A Equal
Option B High
Option C Low
Option D None of these
Answer C

36 The DED process uses material in __________ form? 1

Option A Wire
Option B powder
Option C Both 1 and 2
Option D None of these
Answer C

37 Which of the following step is associated with post-processing AM? 1

Option A Powder Removal
Option B Heat Treatment
Option C Inspection and Testing
Option D All of these
Answer D

38 In Software issue in AM,which of the following error in STL file? 1

Option A Inverted normals
Option B Overlapping triangles
Option C Multiedge triangles
Option D All of these
Answer D

The photopolymers is in the form of a liquid resin filled inside a vat,therefore this
39 1
process is called a Vat Photopolymerization?
Option A TRUE
Option B FALSE
Answer A

40 The major advatange of rapid prototype is___ 1

Option A cut cost and time
Option B more practical and efficient model
Option C computer based model
Option D none of these
Answer A

Unit-VI
Q No. Question Marks
1 The different types of energies associated with a molecule are 1
Option A Electronic energy
Option B Vibrational energ
Option C Rotational energy
O ti D
Option All off the
th mentioned
ti d
Answer D

The results obtained by spectroscopic methods are less reliable, less reproducible and
2
incorrect than classical methods 1
Option A TRUE
Option B FALSE
Answer B

3 During the motion, if the centre of gravity of molecule changes, the molecule possess 1
Option A Electronic energy
Option B Rotational energy
Option C Translational energy
Option D Vibrational energy
Answer C

4 The correct order of different types of energies is 1

E
Option A el >> E vib >> E rot >> E tr
E >> E >> E >> E
Option B el rot vib tr
E >> E >> E >> E
Option C el vib tr rot
E >> E >> E >> E
Option D tr vib rot el
Answer A
5 The region of electromagnetic spectrum for nuclear magnetic resonance is 1
Option A Microwave
Option B Radio frequency
Option C Infrared
Option D UV-rays
Answer B

6 Which of the following is an application of molecular spectroscopy? 1

Option A Structural investigation
Option B Basis of understanding of colors
Option C Study of energetically excited reaction products
Option D All of the mentioned
Answer D

7 Select the correct statement from the following option. 1

Option A Spectroscopic methods require less time and more amount of sample than classical methods
Option B Spectroscopic methods require more time and more amount of sample than classical methods
Option C Spectroscopic methods require less time and less amount of sample than classical methods
Option D Spectroscopic methods require more time and less amount of sample than classical methods
Answer C

8 The transition zone for Raman spectra is 1

Option A Between vibrational and rotational levels
Option B Between electronic levels
Option C Between magnetic levels of nuclei
Option D Between magnetic levels of unpaired electrons
Answer A

9 The criteria for electronic spin resonance is 1

Option A Periodic change in polarisability
Option B Spin quantum number of nuclei > 0
Option C Presence of unpaired electron in a molecule
Option D Presence of chromophore in a molecule
Answer A

10 Which of the following is used in electron microscope? 1

Option A electron beams
Option B magnetic fields
Option C light waves
Option D electron beams and magnetic field
Answer D

11 Electron Microscope can give a magnification up to ___________ 1

Option A 400,000X
Option B 100,000X
Option C 15000X
Option D 100X
Answer D

12 Which of the following are true for electron microscopy? 1

Option A specimen should be thin and dry
Option B image is obtained on a phosphorescent screen
Option C electron beam must pass through evacuated chamber
specimen should be thin and dry, image is obtained on a phosphorescent screen and
Option D
electron beam must pass through evacuated chamber
Answer D

13 Degree of scattering in transmission electron microscope is a function of __________ 1

Option A wavelength of electron beam used
Option B number of atoms that lie in the electron path
Option C number and mass of atoms that lie in the electron path
Option D mass of atoms that lie in the electron path
Answer C

14 Negative Staining is used for examining _____________ 1

Option A virus particles
Option B protein molecules
Option C bacterial flagella
Option D virus particles
particles, protein molecules and bacterial flagella
Answer D

15 Which among the following helps us in getting a three-dimensional picture of the specim 1
Option A Transmission Electron Microscope
Option B Scanning Electron Microscope
Option C Compound Microscope
Option D Simple Microscope
Answer B

16 The secondary electrons radiated back in scanning microscope is collected by? 1

Option A specimen
Option B anode
Option C vacuum chamber
Option D cathode
Answer B

17 On what factors do the intensity of secondary electrons depends upon? 1

Option A shape of the irradiated object
Option B chemical composition of the irradiated object
Option C number of electrons ejected
size and chemical composition of the irradiated object, number of electrons ejected
Option D
and on the number of electrons reabsorbed by surrounding
Answer D
18 Where do we obtain the magnified image of the specimen in SEM? 1
Option A cathode ray tube
Option B phosphorescent screen
Option C anode
Option D scanning generator
Answer A

Which of the following techniques are used in Transmission Electron Microscopy

19
(TEM) for examining cellular structure? 1
Option A Negative-Staining
Option B Shadow Casting
Option C Ultrathin Sectioning
Option D Negative-Staining, Shadow Casting, Ultrathin Sectioning, Freeze-Etching
Answer D

Which of the following component of the light microscope illuminates the specimen by
20
gathering diffuse rays from the light microscope? 1
Option A light source
Option B eyepiece
Option C condenser lens
Option D screws
Answer C

21 The resolution attained by a microscope is limited by _____________________

Option A diffraction 1
Option B refraction
Option C reflection
Option D retraction
Answer A

22 The resolving power of TEM is derived from _______________ 1

Option A electrons
Option B specimens
Option C power
Option D ocular system
Answer A

23 The cathode of transmission electron microscope consists of a ____________________ 1

Option A tungsten wire
Option B bulb
Option C iron filament
Option D gold wire
Answer A

24 During TEM, a vacuum is created inside the _________________________ 1

Option A room of operation
Option B specimen
Option C column
Option D ocular system
Answer C

25 Which of the following component of TEM focuses the beam of electrons on the sample 1
Option A ocular lens
Option B condenser lens
Option C stage
Option D column
Answer B

26 The resolution attainable with standard TEM is less than the theoretical value. 1
Option A True
Option B False
Answer A

27 Image formation in electron microscope is based on ___________________________ 1

Option A column length
Option B electron number
Option C differential scattering
Option D specimen size
Answer C

28 The scanning electron microscope is used to examine _____________ 1

Option A antigens
Option B antibodies
Option C anticoaggulants
Option D cell surfaces
Answer D

29 The AFM uses a _______________ to scan the surface of a molecule. 1

Option A X-ray film
Option B Nanosized tip
Option C Non-metal tip
Option D Nanodrop
Answer B

In X-ray spectrometers, the specimen or the sample is placed after which of the
30
following components? 1
Option A X-ray tube
Option B Monochromator
Option C Collimator
Option D Detector
Answer A
31 Using which of the following components is the generated x-rays focussed upon the spe 1
Option A X-ray tube
Option B Monochromator
Option C Collimator
Option D Detector
Answer C

32 x-ray photoelectron spectroscopy(XPS) is 1

To analyse the surface chemistry pop material after an applied treatment such as
Option A
fracturing, cutting or scrapping.
Option B provides quantitative and chemical state information from the surface of the material
Option C used for surface analysis of organic and inorganic materials
Option D all of the above
Answer D

33 atomic force microscopy works on the principle of 1

Option A iffraction of electrons from the surface of conductive material
Option B transmission of electrons from the surface of conductive material
Option C deflection of probe tip by the attraction or repulsion by the surface
Option D None of these
Answer C
1
34 Aomic Force Microscopy technique can be used with
Option A contact imaging mode
Option B non contact imaging mode
Option C tapping imaging mode
Option D all of the above
Answer A

With the help of which of the following equations is the distance calculated from a
35
known wavelength of the source and measured angle? 1
Option A Coolidge equation
Option B Bragg’s equation
Option C Debye equation
Option D Scherrer equation
Answer B

Which of the following is the most common instrument for photographic recording of
36
diffraction patterns? 1
Option A Debye-Scherrer powder camera
Option B Gamma camera
Option C Geiger tube
Option D Scintillation counter
Answer A
1
37 Diffractometers are similar to which of the following?
Option A Optical grating spectrometer
Option B Prism spectrometer
Option C Photo multiplier
Option D Photovoltaic cell
Answer A

38 following is not true for electron backscatter diffraction 1

it allows studying crystal orientation phase characterization of grain morphology, grain
Option A
boundary internal stresses and defects of the specimen
Option B reflected electrons used for obtaining crystallographic pattern
Option C this technique is used in conjugation with TEM
number of electron signals generated as a result of electron surface interactions such as
Option D
defracted electrons and characteristics x-rays
Answer C

out of following which spectroscopic technique is only giving a complete analysis and
39
interpretation the entire spectrum 1
Option A x-ray photo-electron spectroscopy
Option B energy dispersive x-ray spectroscopy
Option C nuclear magnetic resonance spectroscopy
Option D electron back scatter diffraction
Answer C

40 x-ray photoelectron spectroscopy(XPS) is 1

To analyse the surface chemistry pop material after an applied treatment such as
Option A
fracturing, cutting or scrapping.
Option B provides quantitative and chemical state information from the surface of the material
Option C used for surface analysis of organic and inorganic materials
Option D all of the above
Answer D

41 Nuclear Magnetic Resonance (NMR) can be performed for an atom whose spin is _____ 1
Option A Zero
Option B Non-zero
Option C finite
Option D infinity
Answer B