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100% found this document useful (1 vote)
3K views126 pagesSSC Je Mechanical Ebook
Uploaded by
AMRUTHA MCopyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF or read online on Scribd
/ 126
So ene)
Mechanical
Engineering
{ , Topicwise
Includes :
Objective Solved Papers _ |} Conventional Solved Papers
Paper | Paper ll
Also useful for state engineering services examinations
and other competitive examinations Se ]3
Mechanical
Tes}
Chapter 1
Production Engineering...
1 Metal Casting
2
4
5. Engineering Metrology and Instrumentation.
Chapter 2
Thermodynamics. 8
1. Basic Concepts & Zeroth Law of Thermodynamics... 18,
2. Energy and Energy Interactions... ay
3. First Law of Thermodynamics. eT)
4, Open System Analysis by First Law. 22
5. Second Law of Thermodynamics. 22
6. EMEFOPY nnn 22
7. Properties of Pure Substaneenevnvnnneunnen D3
Chapter 3
Internal Combustion Engine.
1. Basics and Air Standard Cycles. 38
2. Combustion in Sland Cl Engines 34
3
4
Fuels...
Ignition, Engine Friction, Lubrication and Cooling...36
5. Supercharging, Engine Testing and EmissIONS .nnn36
grows
)
Chapter 4
Power Plant Engineering
1. Steam Power Plant
Fuels and Combustion nn
Steam Turbines.
Gas Turbine,
5. Reciprocating Air Compressors,
Rotary Compressor...
Compressible Fluid Flow & Nozzle.
Chapter 5
Strength of Materials
1. Properties of Materials.
53
2._ Simple stress-strain and Elastic Constants 53
3. Shear Force and Bending Moment... a
4. Centroids and Moments oferta. cB
5. Bending Stress in Beams 57
6. Shear Stress in Beams. 57
7. Principal Stess-strain and Theories of Fallt@xuu.57
8 Torsion of Shafts. |
9. Deflection of BeaMS ene 58
10, Pressure Vessels 59
11. Theory of columns. 59
12, Theory of Springs nu 60 6 Chapter 8
apter
cael , Machines. 71 Machine Design
or 1. Design against Fluctuating Load
1. Simple Mechanisms.
oe bean ‘Mechanisms... 2. Cotter and Knuckle Joint.
.Kinema
: Mechanisms with Lower Pairs. 3. Welded and Riveted JoINt vm
‘CAM Design 4, Threaded Joint and Power Scre
“4 : 7
5. Friction. von 5. Shaft, Key and Coupling.
6 Gears... 6. Chain and Belt Drive
7. Dynamics of Machines, Turning Moment, Flywheel .75 7. Clutches.
8. Governors 8. Gear...
9. Bearing. re
Chapter 7
Fluid Mechanics and Fluid Machinery .. Chapter 9
1. Fluid Properties canon
Fluid Pressure & its Measurement
Hydrostatic Forces on Surfaces...
|. Buoyancy and Floatation...
Liquids in Rigid Motion...
2
3
4
5.
6. Fluid Kinematics
2
8
9.
Fadi ie i
Dyn 2. Free Body Diagrams & Equilibrium Equations .u...120
Flow Measurement. 88 §
3. Friction.. 1204
1. Flow Through Pipes.
4. Workand Energy. “ me
10. Laminar Flow. iy i
impulse, Momentum and Collis Ny
11. Turbulent Flow in Pipes ou. 1 es ma
12, Dimensional ANALYSIS oun 91
13, External Flow-Drag and Lif. _o, Chapter 11 j
14, Impulse of Jets... Miscellaneous...... essen 124 |
15. Hydraulic Turbines
143
Section-B: Conventional Paper...
16. Hydraulic Pumps... CHAPTER
een)
np
The purpose of chaplets is
(@) just like chills to ensure directional
solidification
(b) to provide efficient venting
(c) to support the cores
(4) to join lower and upper parts of the moulding
box
[SSC-E : 2007]
The chief advantage of die casting is
(2) possibilty of incorporating thick sections
in small castings
(b) casting of inserts is possible
(0) wide tolerances are possible
(d) high production rates are possible
[SSC-VE : 2007]
Uniform sand hardness is obtained throughout
the mould by which of the following moulding
machines?
(2) Diaphragm moulding
(b) Stripper plate
(c) Sand singer
(d) Squeezing
[SSC-VE : 2008]
The main advantage of shell moulding is that:
(a) a metallic pattern is used
(©) the moulds are stronger
(0) thin sections can be easily obtained
(d) high production rate is possible
[SSC-JE : 2008]
In sand moulding, the bottammost part of the
flask is called
(a) cope (b) cheek
(©) drag (d) flask bottom
ISSC-JE : 2008]
10.
"
In order to ram the sand softer on the pattern
face and harder at the back of the mould, which
of the following types of moulding machines is
used?
@) Jott
(©) Squeezing
(b) Sand stinger
(d) Stripper plate
[SSC-VE : 2008]
The taper provided on pattern for its easy and
clean withdrawal from the mould is called
(@)taper allowance
(b) drat alowance
(c) distortion allowance
(©) pattern allowance
[SSC-JE : 2009]
Which of the following is not a casting process?
(a) Carthias process
(b) Extrusion
{c) Semi-centrifuge method
(d) Slush process
ISSC-JE : 2009]
Surfaces to be machined are marked on the
pattern by the following colour:
(a) Black (b) Yellow
(0) Red (A) Blue
[SSC-JE : 2010]
In order to facilitate the withdrawal of pattern:
(a) Pattern is made smooth
(b) Water is applied on pattern surface
(c) Allowances are made on pattern
(d) Draft is provided on pattern
[SSC-JE : 2010]
Which of the following is not a casting defect?
(a) Hot tear (b) Blow hole
(c) Seab (d) Decarburisation
[SSC-JE : 2010] 13.
14,
15.
16.
7.
18,
SSC-JE_+ Topicwise Previous Solved Papers
Cope in foundry practice refers to:
(a) Bottom half ‘of moulding box
(b) Top half of moulding box
(c) Middle portion of the moulding box
(d) Coating on the mould face
[SSC-VE : 2010]
‘Shrinkage allowance is made by:
(a) Adding to external and internal dimensions.
(b) Subtracting from external and internal
dimensions
(c) Subtracting from external dimensions and
adding to internal dimensions
(d) Adding to external dimensions and
subtracting from internal dimensions
[SSC-JE : 2010]
Hot tears are the result of which of the following?
(a) Lower permeability
(b) Lower green strength
(c) More fins
(4) Restraint of contraction
[SSC-VE : 2011]
Which of the following is not a foundry toot?
(a) Riddle (b) Arbor
(©) Slick (d) Trowel
(SSC-JE : 2012]
The vertical passage for bringing molten metal
to mould cavity is called:
(2) Riser (0) Sprue
(c) Runner (d) Gate
[SSC-E : 2012]
The process of pouring molten metal in the cavity
of a metallic mould by gravity is known as
(a) Permanent mould casting
(b) Pressed casting
(c) Shell moulding
(d) Die casting
[SSC-VE : 2012]
Cupola is best suited for melting
(a) Non-terrous metals
(b) Aluminium alloys
(c) Alloys of Copper
(4) Ferrous metals
[SSC-JE : 2012]
19.
20.
at.
22.
23,
24,
25.
26.
MADE EASY
Permeability of a foundry sand is
(a) Porosity to permit the escape of gases/air ©
(b) Fineness of sand
(0) Distribution of binder in sand
(4) Capacity to hold moisture
[SSC-JE ; 2012]
Permeability is poor for-
(a) Fine grains —_(b) Medium grains
(c) Coarse grains _(d) Rounded grains
[SSC-JE : 2013]
Metal patterns are used for-
(a) small castings
(b) large castings
(c) precise and intricate castings
_{6) large scale production of castings
[SSC-JE : 2013]
The binder in case of synthetic sand used for
moulding is-
(a) Clay (b) Molasses
(c) Water (d) Bentonite and water
[SSC-JE : 2013]
The shape and size of sand grains affects the
following property
(@) Adhesiveness
(c) Refractoriness
(b) Porosity
(d) Strength
[SSC-JE : 2014 (E)]
Cereals are added to the moulding sand to
improve the following
(a) Porosity
(c) Hot strength
(b) Green strength
(d) Edge hardness
[SSC-JE : 2014 (E)]
Plastic toys are usually produced by using:
(a). shell moulding
(b) green sand moulding
(c) plaster moulding
(4) injection moulding
ISSC-JE : 2014 (E)]
To improve the surface finish of castings, the
following additive is used in the moulding sand:
(a) Resins (b) Oils
(c) Wood flour (d) Sea coal
[SSC-JE : 2014 (E)] Mechanical Engineering
27.
28.
31.
33.
34,
Non uniform ramming of moulding sand may
lead to the following casting defect-
(a) scabs (b) swells
(c) blow holes (d) bends
[SSC-UE : 2014 (M)]
‘An important factor to be taken into account
while designing a core print is-
(a) Pouring temperature
(b) Pattern material
(c) Type of mould
(qd) Moulding sand characteristics
[SSC-JE : 2014 (M)]
A casting defect which results in general
enlargement of a casting is known as-
(a) swell (b) shift
(c) sand wash (d) blow hole
[SSC-JE : 2014 (M)]
The process of removing unwanted material from
the casting is called-
(a) blowing
(€) finishing
(b) cleansing
(d) fettling
[SSC-JE : 2014 (M)]
Which of the following material is added to base
sand to impart bonding strength-
(a) sea coal (b) silica
(c) bentonite (a) wood flour
[SSC-JE : 2014 (M)]
One direction solidification in casting can be
improved by using-
(a) chaplets and padding
(b) chills and chaplets
(c) chills, chaplets and padding
(d) chills and padding
[SSC-JE : 2015]
The process of making hollow castings of
desired thickness by permanent mould without
the use of cores is known as-
(a) Die casting —_—(b) Slush casting
(c) Pressed casting (d) Centrifugal casting
[SSC-JE : 2015]
The purpose of chaplets is-
(a) To support the core
(b) To provide efficient venting
(c) Tojoin upper and lower parts ofthe moulding
box
Paper-t : Objective
+_ Production Engineering
(d) Just like chills to ensure directional
solidification
[SSC-JE : 2015]
35. _Inheliumarc welding, the electrode is made of:
(a) copper (b) carbon
(c) mild steel (d) tungsten
[SSC-JE : 2007]
36, Which of the following welding processes uses
nonconsumable electrode?
(a) LASER welding (b) MIG welding
(c) TIG welding —_(d) lon-beam welding
[SSC-VE : 2007]
37. _Inresistance welding, the pressure is released
(a) just atthe time of passing the current
(b) after completion of current
(©) after the weld cools
(d) during heating period.
ISSC-YE : 2007]
38. Oxygen toacetylenes ratio is case of oxidizing
flame is
(a) 134 (b) 12:1
() 15:31 (2st
[SSC-UE : 2007]
39, The material used for coating the electrode is
called:
(2) protective layer (b) binder
(c) slag (d) flux.
[SSC-E : 2008]
40. Which of the following welding processes uses
non-consumable electrode?
(a) Laser welding (b) MIG welding
(c) TIG welding —(d) lon beam welding
> (SSC-E : 2008)
41. Which of the following is not a welding
accessory?
(a) Cable
(c) Hand screen
(b) Electrode holder
(d) Gloves
[SSC-VE : 2008]
42, The transformer used for AC welding sets
(a) booster type —_(b) step up type
de Ye (¢) equal turn ratio type
(c) step down typ Se aah 43.
44.
46.
47.
48.
49.
Inwhich type of welding is a poo! of molten metal
used?
(a) Electroslag
()MIG
(b) Submerged arc
(a) TIG
[SSC-JE : 2008)
Plain and butt welds may be used on materials,
upto approximately :
(a) 25 mm thick (b) 40 mm thick
(c) 50mm thick (d) 70 mm thick
[SSC-JE : 2008]
In are welding, arc is created between the
electrode and work by:
(a) flow of current
(b) voltage
(c) material thickness
(d) contact resistance
[SSC-E : 2008]
For arc heating, the electrodes are made of:
(a) copper (b) aluminium
(c) graphite (d) ACSR conductor
[SSC-VE : 2008]
In arc welding, arc is created between the
electrode and work by
(a) flow of current
(b) voltage
(c) material characteristics
(d) contact resistance
[SSC-VE : 2009]
Oxygen to acetylene ratio in case of neutral
flame is:
(a) 0.8: 1.0 (by 421
(12:1 (2:4
[SSC-E : 2009]
‘The phenomenon of weld decay occurs in
(a) Cast iron (b) Brass
(0) Bronze (d) Stainless stee!
[SSC-JE : 2010]
Projection welding is:
(a) Multi-spot welding process
(0) Continuous spot welding process
(c) Used to form mesh
(d) Use to make cantilevers
[SSC-E : 2010]
SSC-JE_ + Topicwise Previous Solved Papers
51.
52.
53.
54,
55.
87.
Which welding process uses a consumal
electrode?
(a) Laser welding
(0) TIG welding
(b) Thermit welding
(d) MIG welding
[SSC-JE : 2011] |
Welding process using a pool of molten metal
is
(a) Carbon arc welding
(b) Submerged arc welding
(c) TIG welding
(d) MIG welding
[SSC-JE: 2011]
‘Which of the following is an example of semi-
automatic welding process?
{a) TIG welding
(b) MIG welding
(c) Submerged arc welding (SAW)
(d) Resistance welding
[SSC-VE : 2011]
Solder is essentially a
(a) tin-lead base alloy
(b) silverlead base alloy
(c) bismuth-lead base alloy
(d) tin-silver base alloy
[SSC-JE : 2011]
Filler metal is used in
(@) Spot welding
(c) Gas welding
(b) Projection welding
(d) Seam welding
[SSC-E : 2012]
In Arc welding, the arc length should be
approximately equal to:
(a) Diameter of electrode rod
(b) One and a half time the: diameter of electrode
rod
(c) Twice the diameter of electrode
(d) Half the diameter of the electrode rod
[SSC-JE : 2012]
The Soldering Iron is heated in a gas flame until
(a) the bitis the red hot
(b) the coating of Borax on the bit turns black
(c) the gas flame appears orange in the colour
(d) the gas flame appears green in the colour
[SSC-VE : 2012] Mechanical Engineering
58.
59.
60.
61
62,
Paper:
Inwhich type of welding molten metal is poured
{or joining the metals?
(@) Arcwelding ——_(b) Gas welding
() MIG welding (a) Thermit welding
[SSC-UE : 2012]
The soldering process is carried out in the
temperature range-
(a) 15 - 60°C
(ce) 180 - 250°C
(b) 70 - 150
(d) 300 - 500°C
[SSC-YE : 2013]
In electrical resistance welding, both heat and
Pressure are used to effect coalescence. The
pressure necessary to effect the weld varies
from-
(a) 50 - 100 kaffem?
(b) 100 - 200 kat/em?
(c) 250 - 500 kat/em?
(d) 500 - 850 kat/cm?
[SSC-JE : 2013]
In Thermit welding, Aluminium and Iron oxide
are mixed in the proportion of-
(1:3 7 (by 1:2
(co) 1:1 { (d) 2:1
[SSC-VE : 2013]
Spot welding is most suitable for joining parts
having thickness up to-
(a) 50 mm. (b) 30mm
(c) 20mm (d) 10mm
[SSC-JE : 2013]
Thermit welding differs from other methods of
welding in that-
(a) it does not use heat
(b) itis less time consuming
(¢) it does not require electrodes
(d) itemploys exothermic chemical reaction for
developing high temperature
[SSC-JE : 2013]
The commonly used flux for Brazing is-
(a) Slag (b) Borax
(c) Lead (d) Calcium chloride
[SSC-VE : 2013]
Ifelectric current is passed through the metals.
to be joined and heated to the plastic state and
Objective
66.
67.
68.
69.
70.
71
72.
Production Engineering
weld is completed by the application of
pressure, the welding is known as-
(a) Forge weld
(b) Electric arc welding
(c) Resistance welding
(d) Thermit welding with pressure
[SSC-JE : 2013]
Which of the following is an example of solid
state welding?
(a) Gas welding (b) Are welding
(c) Thermitwelding (d) Forge welding
[SSC-JE : 2014 (E)]
Generally used fuel gas in gas welding is
(a) Ny (b) CO,
() CH, (d) He
[SSC-JE : 2014 (E)]
Spot welding, projection welding and or seam
welding belong to the category of:
{a) electric resistance welding
(b) forge welding
(©) thermit welding
(d) are welding
[SSC-VE : 2014 (E)]
Electrode used in TIG is-
(a) Copper (b) Tungsten
(©) Aluminium (d) Cast iron
[SSC-VE : 2014 (M)]
In arc welding temperature generated is of the
order of:
(a) 000°C
(c) 3500°C
(b) t000°¢
(d) 5500°C
[SSC-JE : 2014 (M)]
Consumable electrodes are used in-
(a) submerged are welding
(b) TIG are welding
(©) carbon are welding
(d) MIG are welding
[SSC-VE : 2015]
Black colour is generally painted on?
(a) Acetylene cylinder
(b) Hydrogen cylinder
(c) Oxygen cylinder
(d) None of the option
[SSC-JE : 2018] 74.
75.
76.
77.
78.
SSC-JE + Topicwise Previous Solved Papers
svcd
73.
Reaming is the operation of
(a) enlarging the end of a hole cylindrically
(b) cone shaped enlargement of the end of a
hole
(c) smoothing and squaring the surface around
ahole
(d) sizing and finishing a hole
[SSC-VE : 2008]
A universal dividing head is used to perform a
milling operation by:
(2) plain indexing
(b) direct indexing
(c) differential indexing
(d) compound indexing
[SSC-JE : 2009]
In grinding operation, for grinding harder
material
(a) coarser grain size is used
(b) fine grain size is used
(c) medium grain size is used
(d) any grain size may be used
[SSC-JE : 2009]
When turning long shaft on a lathe, its bending
can be prevented by
(a) running the shatt at low speed
(b) using high speed
(0) using sturdy machine
(d) using steady rest [SSC-JE : 2009]
The operation of sharpening a grinding wheel
is called:
(2) trueing
(c) aligning
(b) dressing
(d) balancing
[SSC-VE : 2009]
In which of the following operations on lathe,
will the spindle speed be minimum?
(a) Knurting (b) Fine finishing
(c) Taper turing (d) Thread cutting
[SSC-JE : 2009]
For driling operation, the cylindrical job should
always be clamped on a:
(2) collect (b) socket
(©) jaw (d) V-block
{SSC-JE : 2009]
81.
82,
84,
85.
86.
mAape
7
Which of the following machines does
require quick return mechanism?
(a) Slotter (b) Planer
(c) Shaper (d) Broaching
[SSC-JE : 2009]
Milling machine is classified as horizontal or
vertical type, depending on the position of:
(@) spindle
(b) work piece
(c) milling cutter
(d) work table or bed [SSC-JE : 2009] 1
Continuous chips are formed when machining:
(a) Ductile material
(b) Brittle material ‘
(c) Heat treated material
(d) None of the above 3
[SSC-JE : 2010]
Size of shaper is specified by:
(a) Length of stroke
(b) Size of table
(c) Maximum size of tool
(d) Ratio of forward to return stroke
[SSC-JE : 2010]
The following type of chip is produced when
machining ductile materials: 7
(a) Continuous chip
(b) Discontinuous chip
(c) Continuous chip and built-up-edge
(d) No chips are produced
[SSC-VE : 2010]
Select the correct sequence of the following
parameters in descending order of influence on
tool lite
1, Feed rate
2. - Depth of cut
3. Cutting speed
(a) 1.2.3
()2,3,1
(b) 3, 1,2
(d) 3,2,4 4
[SSC-JE : 2011] —
In a taper turning operation, maximum an
minimum diameters of the job are ‘D' and ‘d
respectively. What is the -tapper angle, if th
Job length is £7
oss ‘Mechanical Engineering
87.
88.
89.
90.
1.
92.
-(D-d D-d
(a) 2ran(2=4) (b) tan’ 2-8)
(a) 2ran(? = 2)
[SSC-JE : 2011]
(c) tan-(D~ a)
Orthogonal cutting system is also called
(a) one-dimensional cutting system
(©) two-dimensional cutting system
(c) three-dimensional cutting system
(A) None of these [SSC-VE : 2011]
Ina shaper, metal is removed during
(@) forward stroke only
(b) return stroke only
(c) both the forward and the return strokes
(d) neither the forward stroke nor the return
+ stroke
[SSC-JE : 2011]
Quick return mechanism is incorporated ina
{a) Lathe machine (b) Milling machine
(c) Drilling machine (d) Shaping machine
[SSC-JE : 2011]
For which machines, are very large speed range
required?
(a) Drilling (b) Shaping
(0) Grinding (@) Planning
[SSC-JE : 2011]
Which part of the cutting tool is prone to crater
wear?
(a) Face
(c) Base
(b) Shank
(d) Flank
[SSC-JE : 2012]
The size of a Shaper is specified by
(a) Gross weight of machine
(b) Surface area that can be machined in one
hour
(c) Quick return ratio
() Maximum travel of cutting tool
[SSC-JE : 2012]
Railway rails are generally made of
(a) Medium Carbon Steel
(b) High Carbon Stee!
(c) Alloy Steel containing 0.8 to 0.9% Carbon
(d) Mild Steet ISSC-UE : 2012]
Paper-1: Objective
94,
97.
98.
99.
100.
Production Engineering
Incase of slotting machine, cutting action
place in’
(a) forward stroke
(b) downward stroke
(c) backward stroke
(@) upward stroke
[SSC-JE : 2012]
In a drill operation :
(a) Torque is equal to the axial force
(b) Torque is more than the axial force
(c) Torque is less than the axial force
(4) Torque is half the axial force
[SSC-JE: 2012]
Lathe bed is made of:
(a) Cast Iron
(b) Alloy Stee!
(©) High Carbon Stee!
(@) Mild Steet ISSC-E : 2012]
While using High Speed Stee! tools on lathe, the
speed of chuck will be lowest while machining?
(2) Copper (b) Aluminium
(c) Brass a} Cast tron
[SSC-NE : 2012]
When turning Mild Steel, if the area of cross-
section of the cut remain constant, the cutting
force will be minimum if depth of cutis
(a) Approximately equal to the feed per
revolution
(b) One and a half time the feed per revolution
(c) Two times the feed per revolution
(d) Half the feed per revolution
[SSC-JE : 2012]
The most important requisite of a cutting tool
material is-
(@) carbon percentage
(6) percentage of alloying element
(©) red (hot) hardness
(d) easy fabrication
[SSC-VE : 2013]
‘The angle between the face and the flank of the
single point cutting tool is known as-
(a) rake angle (b) clearance angle
(0) lip angle (d) side angle
[SSC-JE : 2013] 0
ise Previous Solved Papers
8
101,
102.
103.
104.
105.
106.
107.
108.
| SSC-JE_ + Topicwi:
Too! signature comprises of how many elements-
(a) 5 (b) 7
(c)9 (a)
[SSC-JE : 2013]
Ahalf nut is-
(a) nut manufactured in parts
(b) nut with half the standard pitch
(c) a double start nut for a quick shaft
(a) mechanism that locks the lathe carriage 10
the lead screw for thread cutting
[SSC-UE : 2013]
‘Automobile gears are generally manufactured
by-
(a) Hobbing (b) Stamping
(c) Extrusion (d) Rolling
[SSC-JE : 2013]
In case of shapper, for finish machining, the
practice is to use-
(a) maximum feeds at high speeds
(b) maximum feeds at slow speeds
(c) minimum feeds at slow speeds
(d) minimum feeds at high speeds
[SSC-JE : 2013]
In which milling operation, is the surface finish
better-
(a) Climb (b) Down
(c) Conventional (d) Face
[SSC-JE : 2013]
The tool material which has high heat and wear
resistance is :
fa) Ceramics
(c) Carbon steels
fb) Cemented carbide
(d) Medium alloy steel
[SSC-JE : 2014 (E)]
The binding material used in cemented carbide
tools is :
(a) Nickel (b) Cobalt
(c) Chromium (d) Carbon
[SSC-JE : 2014 (E)]
The Taylor's correlation between the cutting
speed (V) and the tool life (T) is given by-
(@ “ = Constant (b) VT" = Constant
(c) x = Constant (d) V°T= Constant
[SSC-UE : 2014 (M)]
409. The only angle on which the strength oft
depends, is- 4
(a) lip angle (b) clearance angle
110.
111.
(d) cutting angle
(c) rake angle
[SSC-VE : 2014 (
The relationship between too life (7) and cu
speed (V) is expressed as, when 'r! and'C*
constant.
Toc
(a) VT =C (b) Y=
v
(c) VT?=C (d) FHC
[SSC-VE : 2015]
Crater wear takes place in a single point cuttin,
tool at the-
(a) Face (b) Flank
(c) Tip (d) Side rake
[SSC-JE : 2015]
PAC
112, Which one of the following manufacturing
113,
114.
115.
processes requires the provision of ‘lash gutter?
(a) Closed die forging
(b) Centrifugal casting
(c) Investment casting
(d) Impact extrusion
[SSC-JE : 2014]
Hot working of metal is carried out
(a) Above the Recrystallisation temperature
(b) At the Recrystallisation temperature
(c) Working temperature depends upon
physical conditions of work piece
(d) Below the Recrystallisation temperature |
[SSC-JE : 2012] —
The Forging of the Steel specimen is normally
done at a temperature of:
(a) 800°C (b) 1100°C
(c) 100°C ,_— (d) 400°C
[SSC-JE : 2012]
In order to get the uniform thickness of the plate
by rolling process, one provides-
(a) Camber on the rolls
(b) Offset on the rolls
(c) Hardening of the rolls
(d) Antifriction bearing
[SSC-JE : 2013) 4 Mechanical Engineering
116. Dies for wire drawing are made of-
117.
118.
119.
(a) Cast Steel
(c) Carbides
(b) Cast Iron
(@) Wrought Iron
[SSC-JE : 2013]
Blanking and piercing operations can be
performed simultaneously in-
(a) Simple die (b) Compound die
(0) Progressive die (d) Combination die
[SSC-JE : 2013]
‘Amoving mandrel is used in-
(a) Forging (b) Wire drawing
(c) Tube drawing (4) Metal casting
ISSC-VE : 2015]
The process used for relieving the internal stress
previously set up in the metal for increasing the
machinability of the steel is
(a) Fullannealing —_(b) Normalizing
(c) Process annealing(d) Spheroidising
ISSC-JE : 2015]
EEEIEA) Production Engineering
1.
9.
17.
25.
33.
at,
49.
57.
65.
73.
81.
89,
97.
105.
113,
41,
© 2 @ 3 © 4 @d
(b) 10. (d) 11. (d) 12. (b)
(a) 18. (d) 19. (a) 20. (a)
(d) 26. (a) 27. (b) 28. (d)
() 34 (a) 35. (d) 86. (0)
fa) 42, (©) 43. (a) 44. (a)
() 50. (a) 51. (d) 82. (bY
(a) 58. (d) 5%. (0) 60. (C)
(©) 66. (a) 67. (ce) 6B. fa)
(4) 74. (a) 75. (d) 76. (a)
(a) 82. (a) 83. (a) 84. (c)
(90, () = 9. (a) 9.)
(b) 98. (d) 99. (c) 100. (o)
(b) 106. (b) 107. (b) 108. (b)
(a) 114, (b) 115. (a) 116. (c)
(d)
Papert: Objective +
120.
121,
Production Engineering
Seer cel
Elmore eur
The crank pin is to connected in the bush and
the dimensions for the bush and crank are given
respectively of in mm are 16988, 16388,
Maximum clearance between bush and crank
pin is-
(a) 0.079 mm (b) 0.0079 mm.
(c) 0.035 mm (d) 0.062 mm
[SSC-JE : 2014 (M)]
According to Indian Standard Specifications, a
Plain cartoon steel designated by 40 C8 means
that the percentage of carbon content is-
(a) 0.4t00.6 (b) 0.04
(c) 0.6 t00.8 (d) 0.35 to 0.45
[SSC-JE : 2015]
fc) 6 (ce) 7b) Bb)
@) 14. (d) 15. (b) 16. (b)
(d) 22d) 23. (b) BA. (by
fa) 30, (d) 81. (oe) 92.
(ec) 38d) 89. (d) 40. ()
(a) 46. (c) 47. (a) 48. (b)
(b) 54. (a) 55. (©) 8B. (a)
(a) 62. (d) 63. (d) 64. (b)
(b) 70. (@) 71. @) 72. (0)
(b) 78. (d) 79, (a) 80. (d)
(b) 86. (a) 87. (b) 88. (a)
() 94 (b) 95. (co) 96. (a)
(b) 102. (d) 103. (a) 104. (d)
(a) 110. (oc) 144. (a) 112, (@)
(b) 118. (c) 119. (0) 120. (a) Me
The purpose of chaplets is to support the cores.
He
4. Excellent dimensional accuracy.
2, Smooth cast surfaces
3. Thinner walls can be cast compared to sand
and permanent mold casting.
4. Inserts can be cast in such as threaded
inserts, heating elements, and high strength
bearing surfaces.
5. Reduces or eliminates secondary machining
operations.
6. Rapid production rates.
The chief advantage is high production rates
are possible.
cC)
Uniform sand hardness is obtained through out
the mould by sand slinger. Sand slinging is done
by throwing sand into the flask rapidly and with
great force. This process develops uniform high
mould hardness. The process is very fast and
gives high uniform sand ramming. The sand
should be uniformly sprayed into the mould by
moving the nozzle through the entire area of the
flask. Also it is necessary that the sand be
sprayed in layers to achieve uniform hardness.
ie
The advantage of shell moulding are:
Better surface finish
Better dimensional tolerances
Reduced machining
Less foundary space required
Low labour costs
Can be easily automated for mass
production
High productivity
8. Complex shapes can be made as there is
no need to withdraw the pattern
8. Very fine details and thin sections can be
obtained.
But main advantage is that high production rate
is possible.
Poe
SSC-JE + Topicwise Previous Solved Papers
eee
Bo.
Ge
ae)
Be
i. [)
Ta
In sand moulding, the bottom most part of th
drag is called cheek.
In order to ram the sand soften on the pattern,
face and harder at the back of the mould,
squeeze ramming is used. In squeeze ramming,
a plate slightly smaller than the inside
dimensions of the moulding flask is fitted into
the flask already fitted with the moulding sand,
‘Auniform pressure is applied on the plate, which,
compacts the sand uniformly. The sand next to
the plate rams hardest while the sand below
(face of pattern) is progressively less hard,
‘The taper provided on pattern for its easy and
clean withdrawal from the mould is called draft |
allowance.
Extusion is not a casting process.
Pattern colour coding practice is followed in the
foundary in order to give the necessary
information to the mould maker.
1. Red or Orange : Surface is not to be finished
but left as cast.
2. Yellow : Surface is to be machined.
3. Black : Core prints for unmachined
openings
machined openings.
5. Green : Loose pieces or loose core prints
In order to facilitate the withdrawal of pattern,
draft is provided on pattern. At the time of
withdrawing the pattern from the sand mould,
the vertical faces of the pattern are in continuous
Contact with the mould wall, which may damage
the mould cavity. To avoid this, the vertical faces. Mechanical Engineering
are always tapered from the parting plane. This
allowance ranges from 1/2° to 2°, Dralts always
provided as extra metal over and above the final
dimensions of the pattern,
ei
Decarburisation is not a casting defect.
Ee
Cope in foundry practice refers to top half of
moulding box. The bottom half is called drag
and any intermediate flask used in case of three
piece moulding is called cheek.
Shrinkage allowance is made by adding to
external and internal dimensions.
Oy
Hot tears is the rupturing of casting during
cooling as the metal has restraint to contraction,
thus developing residual stress which finally
leads rupture of casting,
‘* Arbor is not a foundry tool. It is a shaft on
which machining tool is mounted. eg milling
machine.
© Showel tool is used for mixing and tempering
moulding sand and for moving the sand pile
to flask
* Trowel tool is used to shape and smooth the
surfaces of the mould and for doing small
repairs. They are made of steel and are
relatively long and narrow.
* Riddle tool is a screen or sieve used to
remove small pieces of metal and foreign
particles from the moulding sand.
(b)
The vertical passage for bringing molten metal
to mould cavity is called sprue.
TAG
‘The process of pouring molten metal inthe cavity
of a metallic mould by gravity is called
permanent mould casting. Generally two halves
of amould are made from materials suchas cast
iron, steel, bronze, graphite or refractory metal
alloys.
Ibjective
+__ Production Engineering
ai
Cupola is best suited for melting ferrous metals.
Permeability of a foundry sand is the porosity of
sand to permit the escape of gases/air.
om
For fine grains, permeability is poor, Permeability
is defined as the porosity of the moulding sand
in order to allow the escape of any air, gases or
moisture present or generated in the mold when
the molten metal is poured into it, Permeability
is a function of grain size, grain shape and
moisture and clay contents in the moulding sand.
Hala
Metals like aluminium, brass, cast iron are used
for making patterns. The dimensional accuracy
is high butthe limitation is that a wooden pattern
has to be first made to cast the metal pattern,
thus expensive, Hence itis used only for higher
production rates,
Ele
Binders are added to give cohesion to moulding
sand. It provides strength to the moulding sand
and enable it to retain its shape as mould laxity.
So, synthetic sand consisting of silica sand is
added with bentonite and water which provide
bonding strength to it.
Eo
The shape and size of the sand grains affects
various moulding sand properties. The size can
be coarse or fine and the shape can be round
or angular. Coarse grains increase permeability
and fine grains provide surface finish Thus
porosity of sand is determined by the shape and
size of the sand grains.
Cereals are added to the moulding sand to
improve green strength. The moulding sand
containing moisture is termed as green sand.
The green sand should have enough strength
so thatthe constructed mould retains its shape. 121
Plastic toys are usually produced by using
injection moulding. Both thermoplastics and
thermosetting plastics are injection moulded and
various products like cups, containers,
housings, tool handles, knobs, electrical and
communication components, toys and plumbing
fitings are made using this.
fa)
Resins are the additives used in moulding sand
to improve the surface finish of castings. Resins,
natural or synthetic gum with high metting points
like phenol formaldehyde has a good
collapsibility, low gassing and is capable of
delivering a good surface finish.
{b),
Under the influence of the metallostatic force,
the mould wall may move back causing a swell
in the dimensions of the casting. It is caused
due to non-uniform ramming of the moulding
sand.
For all those castings where coring is required,
provision should be made to support the core
inside the mould cavity, which is provided by
core prints. An important factor to be taken into
account while designing a core print is moulding
sand characteristics. Also buoyancy force of the
molten metal decides the design of core prints.
Es)
A casting defect resulting is general
enlargement of a casting is known as swell. It
‘occurs under the metallostatic forces resulting
in mixing back of the mould wall enlarging the
casting,
Em
‘The process of removing unwanted material from
the casting is called fettling,
Ee
‘The popular type of clay - BENTONITE, is the
mater i
pari, which is added to impart bonding
SSC-JE + Topicwise Previous Solved Papers
m
In casting, chills and padding are used
improve directional solidification.
d) 7
Centrifugal casting is the process of making
hollow castings of desired thickness b
permanent mould without use of cores,
in casting process, the purpose of chaplets ig
to support the core.
a
Helium arc welding is TIG welding, with helium
as shielding gas, uses the electrode made of
tungsten.
In resistance welding, the joining of two sheets:
is accomplished by heating by passing current
through electrodes and after the current is
switched off, the pressure is applied to coalesce
the two sheets and pressure is released only
alter the weld (nugget) solidifies.
Ele
In case of oxidizing flame, oxygen volume is
higher than actylene, hence oxygen to acetylene
ratiois 2:4
Eas -
‘The material used for coating the electrode is
called flux,
TIG welding uses non - consumable electrode.
(aj
Cable is not a welding accessory.
ae
‘The transformer used for AC weldit
welding setsis step
down type transformer. ° i
I
i slectosiag welding, a pool of molten metal is. Mechanical Engineering
Bn
Plain and butt welds may be used on materials
upto approximately 25 mm thick,
In arc welding, arc is created between the
electrode and work by flow of current.
tle
For arc heating, the electrodes are made of
graphite.
fa)
In arc welding arc is created between the
electrode and work by flow of current.
a3. [O)
Oxygen to acetylene ratio in case of neutral
flame is 1: 1. Equal volume of oxygen and
acetylene are consumed for neutral flame in oxy-
acetylene welding,
fe
Weld decay is a form of intergranular corrosion
usually of stainless steels or certain nickel-base
alloys, that occurs as the result of sensitization
in the heat-affected zone during the welding
operation. The corrosive attack is restricted to
the heat affected zone (HAZ).
150. (0)
Projection welding is a multi-spot welding
process. It is an electric resistance welding
process that uses small projections,
‘embossments or intersections on one or both
components of the weld to localize the heat and
Pressure. Itis a modification of spot welding.
@
MIG weldit
electrode.
Ee
Submerged arc welding uses a pool of molten
metal. In SAW, the weld arc is shielded by a
granular flux, consisting of lime silica,
manganese oxide, calcium fluoride and other
Compound. The flux is fed into the weld zone by
gravitational flow through a nozzle. The thick
layer of flux completely covers the molten metal.
9 process uses a consumable
Paper-1:: Objective
+ Production Engineering laa
1:3. 1)
Although both MIG welding and submerged arc
welding (SAW) are semi-automatic welding
process, but MIG welding will be chosen as the
more appropriate answer.
(a)
Solder is essentially a tin-lead (Sn- Pb) base
alloy.
Ele)
Gas welding uses filler metal, while all others
are resistance welding which do not require filler
metal
Ee
In Aro welding, the arc length should be
approximately equal to diameter of electrode
rod.
&
The soldering iron is heated in a gas flame until
the bit is the red hot. This type of soldering is
called gas soldering iron which is usually
cordless,
Be
Thermit welding is an exothermic welding
process in which molten metal is poured for
joining the metals.
EG
The soldering process is carried out in the
temperature range 180 - 250°C.
ma
The electrical resistance welding, both heat and
pressure are used to effect coalescence. The
process employs currents of the order of few
kA, voltages range from 2 to 12 volts and times
vary from few ms to few seconds. Force is
normally applied before, during and after the
flow of current to avoid arcing between the
surfaces and to forge the weld metal during post
heating. The necessary pressure shall vary from
30 to 60 N/mm? (300 kgf/cm? to 600 kgf/cm?)
depending upon material to be welded and other
welding conditions SSC-JE_+ Topicwis
Thermit welding is a process in whic!
heated molten metal and slag are produced from
an exothermic chemical reaction between a
metal oxide and a metallic reducing agent. The
name thermit usually refers to a mechanical
mixture of about one part (by weight) finely
divided aluminium and three parts iron oxide
(either F,0, or F,0,) plus possible alloy
additions.
2A\ + Fe,O,> 2 Fe + Al,O, + Heat
2A\ + FeO,» 9 Fe + 4Al,0, + Heat
@
Spot welding is most suitable for joining parts
having thickness upto 10 mm. Higher thickness.
‘spot welded joints will not from a stable weld.
h super
Thermit welding differs from other methods of
welding in that it employes exothermic chemical
reaction for developing high temperature,
Ew
Brazing fluxes usually take the form of chemical
compounds in which the most common
ingredients are borates, fused borax,
fluoroborates, fluorides, chlorides, acids,
alkalies, wetting agents and water. The
commonly used flux is borax.
Gale
If electric current is passed through the metals
to be joined and heated to the plastic state and
weld is completed by the application of
pressure, the welding is known as resistance
welding.
Forge welding is a example of solid state
welding,
Acetylene (C,H,) gas is generally used in gas
welding along with oxygen and it is known as
oxy-acetylene welding,
¢ Previous Solved Papers
Spot welding, projection welding ang
welding belong to the category of gj
resistance welding.
me
Inarc welding, temperature generated is oft
order of 3500°C - 4000°C.
Consumable electrodes are used in MIG a
welding. Other options mentioned uses
consumable electrodes.
©
Oxygen cylinder is painted with black colo
while acetylene cylinder is pointed with maroor
colour, in oxy-acetylence welding.
id)
Reaming is operation of sizing and finishing a)
hole.
@)
A.universal dividing head is used to perform a
milling operation by plain indexing.
(d),
In grinding operation, for grinding hardef
material any grain size may be used, becaus
harder material grinding requires softer wh
and vice-versa. The bonding strength of gritsis
of importance, not the size of grains. Grain size
Plays role for accommodating chips.
is
When turning long shaft on a lathe, its bendi
can be prevented by using steady rest.
mi
The operation of sharpening a grinding wheel
's called dressing. By dressing, grinding whi
is sharpened so that dull grits are removed al
new sharp grits emerges out. + Production Engineering
‘Mechanical Engineering per-|: Objective
73. [eh
For thread cutting, the spindle speed will be
minimum,
For driling operation, the cylindrical job should
always be clamped on a V-block.
@
Slotter, planer and shaper all require quick return
mechanism, Broaching does not require quick
return mechanism
The spindle on which the milling cutter is
mounted may be horizontal for slab milling or
vertical for face and end miling. Hence, milling
machine is classified as horizontal or vertical
type, depending on the position of spindle.
je
Continuous chips are formed when machining
ductile materials.
ia)!
Size of shaper is specified by length of stroke.
When machining ductile materials, the chips
produced are either continuous chips or
continuous chips with built-up-edge (BUE),
depending upon the cutting speed.
6)
Cutting speed is the most significant process
variable in tool life although depth of cut and
feed rate are also important.
vrrah=C
The value of n = 0.15, x = 0.15, y= 0.6 found
‘experimentally indicates that cutting speed, feed
rate and depth of cut are of decreasing
importance
The above equation can be rewritten as
Deere
or, T=C Vat
Ina taper turning operation,
D-d
a
tana.
where a= Hall taper angle
D= Maximum diameter of job
d= Minimum diameter of job
L= Job length
= Taper angle,
D 5)
2b
Orthogonal cutting system is also called two-
dimensional cutting system, while oblique
cutting system is defined as three-dimensional
cutting system.
2a = 2tan(
io
In a shaper, metal is removed during forward
stroke only.
Ea
Quick return mechanism is incorporated in a
shaping machine.
Eaie
For grinding, very large speed ranges are
required.
Ele
Face of the cutting tool is prone to crater wear.
Eis
The size of a shaper is specified by maximum
travel of cutting tool
Ec
Railway rails are generally made of alloy steel
containing 0.8 to 0.9% carbon.
fae :
In case of slotting machine, which is vertical
shaper machine, cutting action takes place in
downward stroke.
me
In a drill operation, torque is less than the axial
force, as axial force comprises of thrust
component (P.)on the web which is greater than
force required (P,) to twist the drill. Lathe bed is made of cast iron, as lathe bed
carries all the parts and undergoes vibration, so
cast iron which have good damping capability is
used as lathe bed material
)
While using high speed steel tools, the speed
‘of chuck will be lowest during machining
aluminum. ~
le
Cutting force will be minimum when depth of
cut is minimum, so depth of cut is halved the
feed per revolution.
Eo
Some important requisites of a cutting tool are
(i) High toughness
(ii) Hot hardness
(iii) High wear resistance
Hae
The angle between the face and the flank of the
single point cutting tool is known as lip angle.
(b)
Tool signature comprises of 7 elements.
Eg. as per ASA,
~~ Yo- Yg~ Cg Cg F
@)
A half nut is a mechanism that locks the lathe
carriage to the lead screw for thread cutting.
Automobile gears are generally manufactured
by gear hobbing, although extrusion and rolling
are also used to produce gears
In case of shaper, for finish machining the
Practice is to use minimum feeds at high speeds.
ae)
Down milling provides the better surface finish
inwhich direction of feed of workpiece and the
cutter are same.
SSC-JE + Topicwise Previous Solved Papers
es ;
Cemented carbides is the tool material whi
has high heat and wear resistance, whj
ceramics has high hardness.
(b)
‘The binding material used in cemented tools ig
Cobalt. Eg. (WC + Co)
rae
Taylors correlation between the cutting speed,
(V) and the tool lfe(T) is given by
Vr" = Constant
a)
mas angle is the angle on which the strength of
the tool depends
ry
The relationship between tool life (7) and cutting
speed (V) is expressed by Taylor's tool life
equation:
vr=C
Ha
Crater wear takes place ina single point cutti
tool at the face of the tool.
ia
Closed die forging is the manufacturing process
which requires the provision of ‘flash gutter’.
(a) :
Hot working of metal is carried out above the
recrystallization temperature. q
Ha
The forging of the steel specimen is normally:
done at a temperature of 110°C. At lower temp
cracks may be formed and also large forging
forces are required.
HEX)
In order to get the uniform thickness of the plate
by rolling process, one provides camber on the
roll. Cambering takes care of roll deflection, due
to which non-uniform thickness is obtained. Mechanical Engineering
a
Pap
Materials for wire drawing dies
1. Allow steels-suitable for medium die lite,
good abrasion resistance.
2. Tungsten carbide die life 2 to 3 times that of
alloy steel, for medium size wires and large
production, excellent abrasion resistance.
3. Diamond for very fine wires with excellent
surface finish.
Tae
With a compound die, several operations on the
same strip may be performed in one stroke at
‘one station, eg blanking and piercing operation
can be performed simultaneously.
ol
‘Amoving mandrel is used in tube drawing,
le!
Full annealing is the process of heating of steel
to about 50 to 75°C above the upper critical
temperature for hypoeutectoid steels and above
the lower critical temperature for hyper eutectoid
steel, in order to reduce hardness and increase
ductility
Process annealing is the recrystallization of cold
worked steel by heating below the lower critical
temperature, with purpose to remove internal
stresses and increasing machinability of steel
In process annealing there is no grain growth
Objective +
Production Engineering
Eda)
Maximum clearance between bush and crank
pin
] 0082 mn
16mm
[ODT
0.035 mm
Pin
UL of bush — LL of crank pin
= (16.017 - 1.938) mm
= 0.079 mm
Ee
‘According to Indian Standard Specifications, a
plain carbon stee! designated by 40C8 means
that the percentage of carbon is 0.96 to 0.45
and the percentage of manganese is 0.60 to
0.90, Itis used for crankshatfts, shafts, spindles,
automobile axle beams, connecting rods, studs,
bolts, lightly stressed gears, chain parts,
umbrella ribs, washers, etc. *
. ~ CHAPTER
Pn yore
Ree cud
y
s
According to which law, all perfect gases
change in volume by 1/273 of their original
volume at 0° for every 1°C change in
temperature when pressure remains constant?
(a) Joule's law (b) Boyle's law
(c) Gay-Lussac law (d) Charle's law
[SSC-E : 2007]
The efficiency of a carnot engine depends on-
(a) working substance
(b) design of engine
(0) type of fuel fired
(d) temperatures of source and sink
[SSC-JE : 2007]
Stirling and Ericsson cycles are’
(a) reversible cycles
(b) reversible
(c) quasistatic cycles
(A) semi-reversible cycles
[SSC-E : 2007]
Zeroth law of thermodynamics defines:
(a) internal energy _(b) enthalpy
(C)temperature (4) pressure
[SSC-JE : 2008]
The efficiency of Camot cycle is maximum for
(@) Gas engine _(b) Reversible engine
(¢) Petrolengine (a) Steam engine
[SSC-VE : 2010]
Which of the following is an itreversible cycle?
(2) Carnot (b) Stiting
(c) Ericson (d) None of the above
[SSC-JE : 2010]
10.
Th
12,
The term NTP stands for
(a) Nominal temperature and pressure
(b) Natural temperature and pressure
(c) Normal temperature and pressure
(d) Normal thermodynamics practice
[SSC-JE : 2010].
Mixture of ice and water form a
(a) Closed system
(b) Open system
(c) Isolated system
(d) Heterogeneous system — [SSC-JE : 2010}
When neither mass nor energy is allowed to
cross the boundary of a system, itis then called:
(a) Open system —_(b) Isolated system
(c) Universe (a) Closed system
[SSC-JE : 2012] |
In case of Boyle's law, if pressure increases by,
1% the percentage decrease in volume is
ay 100
@ i* (6) 397%
1
(9) 95% (A) 0%
[SSC-JE : 2012] 7
‘The boiling and freezing points for water are.
marked on a temperature scale Pas 130°? and |
~20°P respectively. What will be the reading on
this scale corresponding to 60°C on Celsius
scale?
(a) 60°P
(c) 90°P
(b) 70°P
(a) 110°P
[SSC-VE : 2014 (E)] /
Which of the followin,
(@) temperature
(©) density
\g is an extensive property?
(b) pressure
(d) enthalpy
[SSC-JE : 2014 (M)] Mechanical Engineering
13.
14.
15.
16.
47.
18.
19,
20,
Pere uee a
Properties of substances like pressure,
temperature and density in thermodynamic
coordinates are:
(a) path functions (b) point functions
(c) cyclic functions (d) real functions
[SSC-JE : 2007]
Work done in an adiabatic process between a
given pair of end states depends on:
(a) the end states only
(b) particular adiabatic process
(©) the value of index n
(d) the value of heat transferred
[SSC-E : 2007)
Which is true for reversible polytropic process?
(a) Temperature remains constant
(b) Entropy remains constant
(c) Enthalpy remains constant
(d) Some heat transfer takes place
[SSC-JE : 2007]
Change in enthalpy in a closed system is equal
to heat transferred if the reversible process
takes place at constant-
(a) pressure (b) temperature
(©) volume (@) internal energy
[SSC-JE : 2007}
Heat and work are:
(a) Point functions
(0) Path functions
(b) System properties
(d) Intensive properties
[SSC-JE : 2010]
The work done in the expansion of a gas from,
volume V, to V, under constant pressure p is
equal to:
(a) Zero
(©) AV, + %)
(0) AV,- Y))
(d) (Va + V4)
[SSC-JE : 2010]
Which of the following entities is not a
thermodynamic property ?
(a) Temperature (b) Specific volume
(c) Heat (d) Pressure
[SSC-VE : 2012]
Of the following ‘path function’ quantity is :
(@) Temperature (bb) Work done
(©) Pressure (d) Enthalpy
[SSC-VE : 2012]
22,
23,
+ Thermodynamics L19
During throttling, which thermodynamic property
does not change?
(a) Pressure
(c) Enthalpy
(b) Entropy
(d) Internal energy
[SSC-E : 2012]
In a throttling process, the following thermo
dynamic property remains constant-
(a) Enthalpy (b) Entropy
(©) Specificheat _(d) Eneroy
[SSC-JE : 2013]
For a closed system, the difference between
heat added to the system and work done by the
system, is equal to change in-
(a) entropy (b) temperature
(c) internal energy (d) enthalpy
[SSC-VE : 2014 (M)]
3. First Law of Thermodynamics
24,
25.
26.
27.
28.
For which of the following substances, the
internal energy and enthalpy are the functions
of temperature only?
(2) Any gas (b) Saturated steam
(c) Water (@) Perfect gas
[SSC-JE : 2007]
First law of thermodynamics furnishes the
relationship between:
(a) heat and work
(b) heat, work and properties of the system
(c) various properties of the system
(4) various thermodynamic processes
[SSC-JE : 2009]
Work done in a free expansion process is:
(@) Positive (b) Negative
(c) Zero (d) Maximum
[SSC-JE : 2010]
The first law of thermodynamics is the law of
(a) conservation of mass
(b) conservation of energy
(c) conservation of momentum
(d) conservation of heat
[SSC-JE : 2010]
First law of thermodynamics asserts that the
following is a thermodynamic property
(a) Entropy (b) Internal energy
(c) Temperature (4) Pressure
(SSC-E : 2011] SSC-JE + Topicwise Previous Solve
jed Papers E
20 |
29.
31.
932.
33.
34,
For a closed system, the difference between
heat added to and work done by the system is
equal to
(a) enthalpy
(c) Gibbs function
(b) internal energy
(d) flow work
[SSC-JE : 2011]
Which aspect does not pertain to a free
expansion process ?
(a) Work done is zero
(0) Pressure remains constant
(c) No change in the temperature of the system
(d) No gain or loss of heat
[SSC-JE : 2012]
‘The internal energy of a perfect gas depends
on:
(a) Temperature, enthalpy and specific heats
(b) Temperature, entropy and specific heats
(c) Temperature only
(d) Temperature, pressure and specific heats
[SSC-JE : 2012]
During an adiabatic process, the pressure Pof
a fixed mass of an ideal gas changes by AP
and its volume Vchanges by AV. The value of
AV
77 is given by:
ap 1aP
(@) 0)
1 AP AP
() ap OE
[SSC-VE : 2012]
2
The expression [pdv gives the measure of
work done during’
(a) steady flow reversible process
(b) non-flow reversible process
(c) open system and any process
(d) any system and any process
[SSC-JE : 2013]
Which property is an intensive property of the
system-
(a) Specific enthalpy
(b) Volume
(c) Kinetic energy
(d) Entropy
[SSC-VE : 2013]
35.
37.
38.
39.
40.
One of the extensive properties of'a the
dynamic system amongst the following is.
(a) pressure (b) volume 4
(c) temperature (d) density :
[SSC-VE : 204
{ftwo liquids at different temperatures are mixed,
then the final temperature of the mixture of liqu
can be obtained by using-
(a) Zeroth law of thermodynamics
(b) First law ‘of thermodynamics
(c) Second law of thermodynamics
() Third law of thermodynamics
[SSC-VE : 2013]
Heat supplied to a system equals the work done
incase of non-flow process carried out-
(a) isochorically _(b) isobarically
(c) isothermally _(d) adiabatically
[SSC-J
: 2013]
In an isothermal process, the internal energy :
(a) always increases
(b) always decreases
(c) increases or decreases
(d) remains constant
: 2014 (E)]
[SSC-JI
An adiabatic process in a thermodynamic
system is one in which there is?
(a) alimited heat transfer to or from the system”
through the boundary
(b) no heat transfer to or from the systern through
the boundary
(6) no energy transfer to.or from the system
through the boundary
(d) no internal energy change in the system
[SSC-JE : 2014 (E)]
A gas ina container A is in thermal equilibrium
with another gas of the same mass in container
8.If the corresponding pressures and volumes
are denoted by suffixes A and B. Then which of
the following statements is true?
(8) Py # Pa.Va = Ve (b) Py = Po. Va # Vy
(C) PaVg = PaVq (d) Mechanical Engineering
at.
42.
44.
A closed balloon containing 10 kg of helium
receives 5 kJ/kg of heat. During this process,
the volume of the balloon slowly increases by
0.2 m? at constant pressure of 100 kPa. The
change in internal energy, in kd, is:
(a) 10 (b) 20
(c) 30 (d) 70
[SSC-JE: 2014 (E)]
The process in which no heat enters or leaves
the system is called as-
(2) isentropic (b) isobaric
(c) isochoric (d) isothermal
[SSC-JE : 2014 (M)]
Two gases Xand Yhaving the same temperature
T. the same pressure Pand the same volume V
are mixed. If the mixture has the volume Vand
temperature T, then the pressure of the mixture
will be-
(a) 4P
()P
{b) Pia
(d) 2P
ISSC-UE : 2014 (M)]
The piston of a vertical piston-cylinder device
containing a gas has a mass of 60 kg and a
cross-sectional area 0.04 m®. The entire system
is placed in a vacuum chamber. If temperature
of the gas is 70°C. What is the pressure of gas
inside the cylinder? g = 9.8 m/s?
A=0.08 a?
(a) 0.7 bar
(c) 0.3 bar
(b) O bar
(d) 0.147 bar
[SSC-JE : 2014 (M)]
An isothermal process is one in which :
(@) The pressure of the gas in the system is
Proportional to the volume of the gas
(b) The internal energy of the system under
Consideration decreases during the change
(c) The heat transfer of the system under
Consideration is zero
(d) The temperature of the system under
Consideration remains constant during the
change
[SSC-UE : 2014 (M)]
Paper-t : Objective
46.
47.
49.
50.
+ Thermodynamics | 21
‘As per first law of thermodynamics, when any
system confined within a boundary is carried
through series of operations such that the final
state is same as the initial state then:
(2) the net work transfer is equal or higher than
the net heat transfer
(b) the net work transfer is higher than the net
heat transfer
(c) the net work transfer is equal to the net heat
trarisfer
(d) the net work transfer is lower than the net
heat transfer
[SSC-JE : 2015]
In an isothermal process, the heat transfer is-
(a) equal to the work transfer
(b) less than or equal to the work transfer
(c) less than the work transfer
(d) more than the work transfer,
[SSC-JE: 2015]
The area below th p-V diagram of a non-flow
process represents-
(a) work transfer
(c) heat transfer
(b) entropy transfer
(a) mass transfer
[SSC-E : 2015]
The efficiency of a Carnot engine depends on-
(@) The duration of the working of the engine
(0) The nature of the working fiuid
(C) The temperature limits of working fluid
(d) The capacity of the engine
(SSC-E : 2015]
Enthalpy is calculated as the -
(a) Sum of internal energy and the product of
pressure and density of the system
(b) Sum of internal energy and the product of
pressure and volume of the system
(c) Difference between the internal energy and
the product of pressure and density of the
system
(d) Difference between internal energy and the
product of pressure and volume of the
system
[SSC-VE : 2015} 22 |
Open System Analysis by First Law 57.
51.
52,
SSC-JE + Topicwise Previous Solved Papers
‘An open system is one in which:
{a) Mass does not cross boundaries of the
system, though energy may do so
(b) Neither mass nor energy crosses the
boundaries of the system
(c) Both energy and mass cross the boundaries
of the system
(d) Mass crosses the boundary but not the
energy
[SSC-JE : 2010]
Neglecting changes in potential and, kinetic
energies, the shaft work during a steady flow
process is given by-
(a) Jodv
(©) JT ds
(b) fvap
(d) fsar
[SSC-JE : 2013]
Breau ed
53.
54.
56.
‘Second law of thermodynamic defines:
(a) entropy (b) enthalpy
(c) heat (d) work
[SSC-JE : 2010]
For a thermodynamic cycle to be irreversible, it
is necessary that
@ §2-0 (0) $2 <0
T
(d) §2 20
[SSC-JE : 2011]
() §2>0
The maximum efficiency that a heat engine,
operating between 327°C and 27°C, can be:
(b)
P
[SSC-VE : 2012]
For an irreversibje thermodynamic cycle-
dQ
(a) J>0 (b) Je