( MECH - 01 )

QUESTION PAPER

LIMITED DEPARTMENTAL COMPETITIVE EXAMINATION - 2007

FOR THE POST OF CHARGEMAN-GR.II (T) & (NT)

SUBJECT: GENERAL ENGG & MECHANICAL ENGG CODE: 2.01 / 221

Sr. No. … … … … … … … … … … … … … ROLL NO.

Signature of the Invigilator … … … … … … … … … … … … … … …

Date: 23.09.2007 Duration : 3 Hours.

Time: 14:00 Hrs to 17:00 Hrs. Max. Marks : 100

Instructions: Please read the following instructions carefully before writing your answers:
1) All Questions in Part - A & Part - B are compulsory.
2) Each Questions in Part - A carries 1 mark and that in Part - B carries 5 marks.
3) There are four alternatives - (A), (B), (C), (D) given against each question in Part - A out of
which only one is the most appropriate answer.
If (A) is correct, round on the correct alternative like (A)
4) The discarded answer if any, must be crossed properly and supported by initial of the
candidate.
5) If a question in Part - A is answered wrongly or more than one answers are marked,
0.25 marks will be deducted for each such question.
6) Use only blue or black ball pen only. Use of Pencil is not allowed.
7) No sheet from the Question Paper / Answer Book should be detached.
8) You may do rough work, if required, on the blank sheets.
9) Please DO NOT repeat DO NOT write your name anywhere in the Question Paper.

For Examiners only

Part - A
Correct Wrong No Total
Answers Answers Answers (80)

Part - B
Q.81 Q.82 Q.83 Q.84 Total
(5) (5) (5) (5) (20)

SUMMARY OF MARKS OBTAINED

Part - A Part - B Total
Marks (100)
(80) (20)
Obtained
 ( MECH - 02 )
PART - A
(Each question carries 1 mark)

Q.1. What is unit ?

(A) It is a chosen standard to measure quantities
(B) It is a quantity of different measurements
(C) It is a number that expresses quantity
(D) All the above

Q.2. What is the unit of force in MKS system ?

(A) joules (B) kg. m (C) newton (D) ergs

Q.3. Find square root of 48841 ?

(A) 231 (B) 621 (C) 211 (D) 221

Q.4. The points (-1, 5) & (-2, -3) lie in ______ quadrants respectively of the X-Y co-ordinate
system:
(A) 1st & 3 rd (B) 2nd & 4th (C) 2nd & 3rd (D) 3rd & 4th

Q.5. What is the ratio of 172 to 258 ?

(A) 1:3 (B) 2:3 (C) 2:7 (D) 3:7

2
Q.6. Convert the fraction into a percent:
3
1 2 2
(A) 63 % (B) 66.25 % (C) 66 % (D) 39 %
3 3 3

Q.7. Which pair in following contains unlike terms?

(A) 3x, ? 7x (B) 4x, 7x (C) 4xy, ? 9xy (D) 4xy, ? 9xyz

Q.8. Sum of the expressions 3x + 4y – 5z, 2x + 5y, 7x – 8y and 4x – 9y – 5z is:

(A) 16x – 8y – 10z (B) 6x – 26y – 10z
(C) 6x + 26y + 10z (D) 16x – 8y + 10z

Q.9. What is the area of the right triangle with hypotenuse 5 cm & other two sides are 3 cm &
4 cm each ?
(A) 6 cm2 (B) 10 cm2 (C) 5 cm2 (D) 7.5 cm2

Q.10. The value of Cos(A + B) is:

(A) Cos A . Cos B + Sin A . Sin B (B) Cos A . Cos B – Sin A . Sin B
(C) Sin A . Cos B + Cos A . Sin B (D) Sin A . Cos B – Cos A . Sin B

Q.11. In high carbon steels, hardness is obtained at the expense of:

(A) Ductility (B) Toughness (C) Both ‘A’& ‘B’ (D) Neither ‘A’nor ‘B’

Q.12. Annealing cannot:

(A) Soften the steel and improve machinability
(B) Relieve internal stresses induced by rolling, forging or uneven cooling
(C) Remove coarseness of grain
(D) None of these
 ( MECH - 03 )

Q.13. A substance of certain quantity has a mass of 150 gms and has a volume of 30 cm3.
It’s density is:
(A) 4.5 gms / cc (B) 45 gms / cc
(C) 5 gms / cc (D) 50 gms / cc

Q.14. Young’s modulus of a wire is defined as the stress which will increase the length of wire
compared to its original length by:
(A) Half (B) Same amount (C) Double (D) One fourth

Q.15. The momentum ( p ) of a body is a product given by :

(A) p=ma (B) p=Fa (C) p=mF (D) p=mv
where m is mass of body
a is acceleration of body
v is velocity of body
F is force on the body

Q.16. If the resultant of a number of forces acting on a point is zero, the system of forces are
said to be:
(A) Concurrent (B) Congruent
(C) in equilibrium (D) in inertia of direction

Q.17. A force of 49 newtons is just able to move a block weighing 10 kg on a rough horizontal
surface. Calculate the co-efficient of friction:
(A) 0.2 (B) 0.3 (C) 0.5 (D) 0.8

Q.18. A light and a heavy body have equal momentum. Which one has greater Kinetic Energy
(K.E) ?
(A) The light body (B) Both have equal K.E
(C) The heavy body (D) Data given is incomplete

Q.19. Mechanical advantage is the ratio of:

(A) Output to Input (B) Force of friction to reaction force
(C) Load to effort (D) Force to resistance

Q.20. The intensity of stress which causes unit strain is called:

(A) Unit stress (B) Modulus of rigidity
(C) Bulk modulus (D) Modulus of elasticity

Q.21. Property of material due to which it can be rolled or hammered into thin sheets is known
as:
(A) Brittleness (B) Ductility (C) Malleability (D) Fatigue

Q.22. Property of material due to which they can be drawn into wires, is known as:
(A) Elasticity (B) Plasticity (C) Stiffness (D) Ductility

Q.23. Ability of material to resist deformation due to stress is known as:

(A) Toughness (B) Stiffness (C) Plasticity (D) Hardness
 ( MECH - 04 )
Q.24. If a material is heated, its toughness:
(A) Increases (B) Decreases
(C) Remains same (D) None of these

Q.25. The process of reheating hardened steel to temperature below the lower critical
temperature followed by any desired rate of cooling is known as:
(A) Hardening (B) Spheroidizing
(C) Tempering (D) Annealing

Q.26. Ball bearings are generally made of:

(A) Cast iron (B) Carbon steel
(C) Stainless steel (D) Carbon chrome steel

Q.27. A special form of piercing in which the entire contour is not cut, is known as:
(A) Slotting (B) Notching (C) Trimming (D) Lancing

Q.28. For treatment of castings, which process is required:

(A) Solution annealing (B) Normalising
(C) Stress relieving (D) Tempering

Q.29. The operation of cutting holes in shearing process in sheet by a press is known as:
(A) Drilling (B) Slitting (C) Punching (D) Slotting

Q.30. Press forging:

(A) employs a very fast squeezing action (B) does not allow time for flow of the metal
(C) is used for forging only small section (D) All ‘A’, ‘B’& ‘C’

Q.31. Forging of plane carbon steel is carried out at ______ oC:

(A) 900 (B) 1100 (C) 1300 (D) 1500

Q.32. To save a machine from heavy damage, gears of following material is used:
(A) Fibre (B) Mild steel
(C) Stainless steel (D) Cast iron

Q.33. An overload relay is provided to load to:

(A) Restrict the input power
(B) Save the load from burning or damage
(C) Save the driving system from burning
(D) None of these

Q.34. An ideal traction system should have:

(A) High starting tractive effort
(B) Easy speed control
(C) Equipment capable of withstanding large temporary overload
(D) All of the above

Q.35. A four wheel drive has:

(A) No differential (B) Differential on rear side only
(C) Differential on front side only (D) Both front as well as rear differential
 ( MECH - 05 )
Q.36. The tool used for separating a metal on a lathe is called:
(A) Turning tool (B) Separating tool
(C) Parting tool (D) Threading tool

Q.37. Knurling is an operation used to provide a surface with:

(A) Proper turning (B) Gripping
(C) Proper shining (D) All of these

Q.38. Cylindrical parts essentially made by _______ tools:

(A) Milling (B) Turning tool
(C) Knurling (D) Any cutting tool

Q.39. Grinding wheels are used for:

(A) Sharpening (B) Finishing (C) Shaping (D) All of these

Q.40. A standard ground drill has a point angle of:

(A) 180o (B) 112o (C) 119o (D) 121o

Q.41. The rake angle for medium carbon steel cutting is:
(A) 0o (B) 8o (C) 14o (D) 20o

Q.42. What is the typical value of front clearance angle:

(A) 0o (B) 6o (C) 20o (D) 30o

Q.43. Cutting speed and spindle speed is related by following expression:

(CSx1000) (? dx1000)
(A) N= (B) N=
?d CS
(CSx? ) (dx1000)
(C) Nd = (D) N=
1000 ? xCS
where CS is cutting speed in m/min
N is speed of spindle in rpm
d is diameter of job in metre

Q.44. What is the least count of a micrometer screw gauge whose pitch is 1 mm and thimble
has 200 equal divisions:
(A) 0.025 (B) 0.5 (C) 0.05 (D) 0.005

Q.45. What is the maximum accuracy achieved by filing:

(A) 0.1 mm (B) 1 mm (C) 0.01 mm (D) 0.005 mm

Q.46. The purpose of using the flux in soldering is to:

(A) increase fluidity of solder material
(B) fill up gaps in bad joint
(C) prevent oxide formation
(D) lower the melting temperature of the solder

Q.47. In a machining operation on free cutting mild steel, the cutting speed is mentioned as
70 m/min. What should be the material of cutting tool ?
(A) Carbon steel (B) High speed steel
(C) Carbide (D) Diamond
 ( MECH - 06 )
Q.48. Chisels used for metal cutting are:
(A) Hardened (B) Annealed
(C) Hardened & tempered (D) Annealed, hardened & tempered

Q.49. The coolant generally used while machining with carbide tools is:
(A) Kerosene (B) Water
(C) Compressed air (D) Soluble oil

Q.50. If for a 1:5 taper, the taper angle is 11o 25?, the angle for 1:20 taper will be:
(A) 11o 25? (B) 5o 43? (C) 2o 51? (D) 22o 50?

Q.51. The function of a chip breaker in a cutting tool is:

(A) to provide smooth path for long chips
(B) to break the chips into short segments
(C) to get long curled chips
(D) to remove chips from bed

Q.52. As general rule for the relationship between the tool life (T in min) and cutting speed
(V in m/min), K a constant depending on the cutting tool material is given by VTn = K
and the exponent n depends on:
(A) cutting speed (B) machine characteristics
(C) material to be cut (D) tool shape, use of cutting fluid

Q.53. A lathe centre is being ground up by 75 mm diameter grinding wheel fixed to tool post
grinder on the compound side. If centre of the wheel is 6 mm below the axis of the lathe
centre and the compound slide fed at 30o, the angle to which the centre will be ground:
(A) 60o (B) less than 60o (C) more than 60o (D) 55o

Q.54. A 250 mm diameter is turned at a cutting speed of 20 m/min, feed 0.5 mm per revolution
of spindle at spindle speed of 25 rpm. Now, if the diameter of the work piece is doubled
and cutting speed is also doubled, the time taken to turn the job will be:
(A) Four times the original time (B) Double the original time
(C) No change in turning time (D) One fourth the original time

Q.55. An examiner has given the following as parts of drill bit. Find which one is not correct:
(A) Dead centre (B) Shank (C) Point (D) Eye

Q.56. Taper shank on drills is provided for:

(A) Drilling taper holes (B) Quick intersection in spindle
(C) Use on tapered surfaces (D) None of these

Q.57. A feeder gauge is used to check:

(A) Screw pitch (B) Diameter of round objects
(C) Surface roughness (D) Thickness of a clearance

Q.58. Precision is:

(A) The repeatability of measurement process
(B) Agreement of the results of a measurement with the true value of the measured
quantity
(C) The ability of a measuring device to detect small differences in a quantity being
measured
(D) The ability of an instrument to reproduce same reading under identical conditions
 ( MECH - 07 )
Q.59. Which one of the following is not included in the combination set ?
(A) Short rule (B) Square (C) Centre head (D) Protector

Q.60. Which is not a part of Shaper ?

(A) Ram (B) Tool head (C) Table (D) Cross slide

Q.61. When a thin job is to be machined on a shaper, in order to prevent wrapping, which one
of the following steps should be taken first ?
(A) Light cut (B) Heavy cut (C) Single Heavy cut (D) All of these

Q.62. Steel balls are required in large quantities. Which process would you select for
manufacture ?
(A) Turning on a lathe (B) Turning on a auto lathe
(C) Casting (D) Cold heading

Q.63. In gang milling:

(A) Work moves in the same direction as the rotation of the cutter
(B) Work moves in the opposite direction of the rotation of the cutter
(C) Work is fed into the rotation of the cutter
(D) More than one cutter is simultaneously used

Q.64. Which bond is commonly used in grinding wheels ?

(A) Vitrified bond (B) Silicate Bond
(C) Shellac bond (D) Resinoid bond

Q.65. In case of turning or milling, the surface roughness is expected to be in the range:
(A) 5? to 15? (B) 20? to 50?
(C) 50? to 100? (D) 100? to 250?

Q.66. Which of the following centre is used for holding hollow jobs on a lathe ?
(A) Square centre (B) Half centre
(C) Oil groove centre (D) Pipe centre

Q.67. Trepanning tool is used for:

(A) Lathes (B) Planners
(C) Milling machine (D) Cold heading machine

Q.68. Which of the following is single point cutting tool ?

(A) Milling cutter (B) Hacksaw blade
(C) Grinding wheel (D) Parting tool

Q.69. A rolling mill is specified by:

(A) Roll diameter (B) Gross weight
(C) Pressure exerted (D) Width of the rolls

Q.70. Clearance between mating surfaces is checked by:

(A) Snap gauges (B) Filler gauges
(C) Optical gauges (D) Plug gauges

Q.71. Vernier calliper is used to measure:

(A) External & internal diameters (B) Length
(C) Thickness (D) All of these
 ( MECH - 08 )
Q.72. Internal gears and splines used in automobile industry are manufactured by:
(A) Casting (B) Milling (C) Breaching (D) Hobbing

Q.73. Die casted gears are generally used in:

(A) Counters (B) Toys (C) Cameras (D) All of these

Q.74. Hobbing process cannot be used for cutting:

(A) Spur gears (B) Helical gears (C) Worm gears (D) Bevel gears

Q.75. Trepanning operation is used for:

(A) under cutting (B) finishing the ends of the job
(C) cutting grooves (D) producing large holes

Q.76. The operation of finishing a drilled hole to the correct size is known as:
(A) Reaming (B) Counter sinking
(C) Counter boring (D) Spot facing

Q.77. Plug rolling is used to:

(A) Remove out of roundness of pipes
(B) Cut threads at the end of pipes
(C) Reduce the diameter of pipe
(D) Reduce the wall thickness and increase diameter of tubes already made

Q.78. The process of joining two slip gauges is known as:

(A) Piercing (B) Soldering (C) Welding (D) Wringling

Q.79. A fly cutter is used on:

(A) Lathe (B) Capstan lathe
(C) Shaper (D) Milling machine

Q.80. Loading of grinding wheel occurs when:

(A) Part of grinding surface give way
(B) Cavities are formed on the surface of the grinding wheels
(C) Abrasive grains become clogged with particles of metal being ground
(D) Long cracks develop on grinding wheel from centre to outer diameter

PART - B
(Each question carries 5 marks)

Q.81. How an electric shock occurs ?

Q.82. Write down:

i) The characteristic of tool materials
ii) Tool materials in common use

Q.83. Write short notes on:

i) Interference fits
ii) Surface measurements

Q.84. What are the factors that affect tool life ?