WBPSC JE (Junior Engineer) exam is conducted by the West Bengal Public Service Commission for the recruitment of Junior Engineers in various departments of the West Bengal government. The exam typically consists of a written test(100 Questions X 2 Marks each =200 Marks, 2 Hours) and an interview. The written test typically includes technical subjects related to the candidate’s field of engineering. The interview is used to assess the candidate’s technical knowledge, problem solving ability and communication skills. The selection process may vary depending on the specific post for which the candidate is applying.
As we all know the exam question paper is not available for many of aspirants so we decided to collect it and upload all previous year’s Question at one place. Now you can practice the questions anytime anywhere through your Smartphone. Here we uploading WBPSC JE MECHANICAL (2004) Questions. Soon we upload all previous year questions of 2005, 2009, 2016 and so on.
You can also practice WBPSC JE MECHANICAL ENGINEERING Previous Year (2018) Question Papers With Answers.
N.B- All questions are taken from WBPSC exam’s original question paper to help students at free of cost. we try our best to provide the same questions, if any Questions found incorrect we really sorry for that, please give us your valuable feedback so that we can Improve ourselves to give you better content in future.
WBPSC JE MECHANICAL (2004) QUESTION PAPER
1. Moulding sand must have porosity so that
(A) There is no gas holes in the casting
(B) There is no cracking in the casting
(C) There is no shrinkage in the casting
(D) None of the above
View Answer
2. Limiting force of friction is defined as the frictional force which exists when a body
(A) Just begins to slide over the surface
(B) Is stationary
(C) Is moving with maximum velocity
(D) None of the above
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3. The safe value of stress under which a member subjected to reversible tensile or compressive stress will not fail is known as
(A) Safe stress
(B) Proof stress
(C) Endurance limit
(D) Fatigue stress
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4. Greenhouse effect is caused by increase in concentration of
(A) CO2
(B) CO
(C) NO2
(D) SO2
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5. The stiffness of the closed-coil helical spring, subjected to axial load “W” is equal to
(A) GD4/64R3n
(B) GD4/64R2n
(C) GD4/64Rn
(D)GD3/64R3n
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6. Lead poisoning in water pipe line can be minimized by supplying
(A) Heavy water
(B) Hard water,
(C) Soft water
(D) None of the above
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7. The necessary condition for the forces acting on a body to be in equilibrium is that those forces should be
(A)Coplanar
(B) Should not meet at point
(C) In the same direction
(D) Similar in nature
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8. In most of individual drive of metal cutting machine uses
(A)Cross-belt drive
(B), V-belt drive
(C) Flat belt drive
(D) None of the above
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9. Which one of the following is, not related to a twist drill?
(A) Flute
(B)Jig
(C)Tang
(D)Shank
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10. In case of a shaper machine, the ram should move
(A) Slower during return stroke
(B)At the same speed during return stroke
(C) Faster during return stroke
(D)None of the above
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11. Heat treatment furnaces are used to get
(A) Desired Properties
(B) Cast Iron
(C) Pig Iron
(D) Wrought Iron
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12. The process of Introducing carbon into low carbon steel in order to produce a hard surface is known as
(A) Cyaniding
(B) Nitriding
(C) Carbonitriding
(D) Carburizing
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13. Temperature of gas is produced due to
(A)Attraction of molecules
(B)Repulsion of molecules
(C)Its own heating value
(D) Kinetic energy of molecules
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14. The size of a shaper is given by
(A)Maximum height of the machine
(B)Maximum length of the stroke,
(C)Maximum length of the machine
(D)All of the above
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15. Brown and Sharpe taper is generally used in
(A) Milling machines
(B) Drills
(C) Shapers
(D) Lathe
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16. Which of the following threads is trapezoidal in section?
(A) Metric
(B) Square
(C) Acme
(D) Knuckle
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17. The effect of slip on velocity ratio of the belt is to
(A) Keep tile velocity ratio constant
(B)Increase the velocity ratio
(C) Decrease the velocity ratio
(D)None of the above
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18. In Case of a planer machine
(A)Planer used for smaller size work piece compared to shaper
(B)Cutting action is made during the return stroke
(C) Flat surfaces cannot be produced on a planer
(D) The work travels past a stationary tool
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19. A thin cylinder of diameter d, wall thickness t is subjected to an internal pressure p. The longitudinal stress will be
(A) Pd/4πt
(B) πpd/4t
(C)Pd/2πt
(D)Pd/4t
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20. Continuity equation is to be balance of
(A) Momentum
(B) Energy
(C) Mass
(D) Torque
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21. For a helical spring of mean diameter D, wire diameter d, number of coils n. modulus of transverse elasticity c, when subject to an axial load W. The deflection would be
(A) 8Wn/cd3D4
(B) 8WnD3/cd4
(C) WnD3/cd4
(D) 2WnD3/cd4
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22. The word scavenging is generally associated with
(A)High speed engines
(B) Vertical engines
(C) Multicylind.er engines
(D) Two stroke engines
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23. A Bell-Coleman cycle is
(A)Reversed Rankine cycle
(B) Reversed Otto cycle
(C) Reversed Joule cycle
(D) Reversed Carnot cycle
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24. The contraction allowance for pattern depends on
(A)Pouring temperature
(B) Composition of the metal
(C) Process of casting used
(D) All of the above
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25. A coil is cut into two halves the stiffness of new coils will be
(A) Same
(B)Half
(C) Double
(D) None of the above
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26. One ton(1 T) of refrigeration is equivalent to
(A) 5 kw
(B) 2.5 kw
(C) 1 kw
(D) 3.5 kw
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27. The maximum force that can a single point cutting tool withstand is
(A)Inertia force
(B) Cutting force
(C) Feed force
(D) Thrust force
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28. Choose correct statement:
(A)Repeated blows are used in press forging
(B) Roll forming is used in rolling mills
(C) In cold drawing size is reduced, strength & finish are Improved
(D) Extrusion is used to punch holes
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29. Laser welding finds widest application in
(A) Heavy industry
(B) Structural work
(C)Electronic industry
(D) Process industry
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30. The range of coefficient of discharge (cd) for a venturi meter is
(A) 0.95-0.99
(B) 0.8 – 0.9
(C)0.7 – 0.8
(D) 0.6 – 0.7
View Answer
31. Steel that can be easily hardened by heat-treatment is
(A) High-Carbon steel
(B) Low-Carbon steel
(C) Medium-Carbon steel
(D) None of the above
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32. In a refrigeration cycle, the heat is rejected by refrigerant at
(A)Condenser
(B) Evaporator
(C) Compressor
(D) Expansion valve
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33. Slip in belt drive is
(A) Difference between the linear speed of the rim of pulley and the belt on it
(B)Difference between the angular velocities of two pulleys
(C) Loss of power
(D) Difference between the velocities of two pulleys
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34. The process involving the heating of steel above upper critical temperature and then quenching in a medium, such as brine, water or oil is known as
(A)Annealing
(B) Tempering
(C) Normalizing
(D) Hardening
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35. In a basic NC machine; programmed instructions are stored on
(A) Head box
(B) Punched tape
(C) Graphic terminal
(D) None of the above
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36. Which of the following is not a hardening process
(A) Nitriding
(B) Carburizing
(C) Spheroidizing
(D) Cyaniding.
View Answer
37. All straight-shanked drills used in drill press work must be held in the
(A) Vise
(B) Tapers sleeve
(C) Key type drill chuck
(D) Spindle of the drill press
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38. Which one of the following is not a cutting tool
(A) H.S.S.
(B) Cemented carbides
(C) Stellites
(D) Bronze
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39. In forging greater strength is obtained because
(A) Metal becomes heat treated
(B) Metal is hammered in cold condition
(C)Beneficial grain flow is obtained
(D) None of the above
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40. In centrifugal pumps, maximum efficiency is obtained when the blades are
(A) Radial
(B) Bent forward
(C) Straight
(D) Bent backward
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41. A twisting couple in a shaft induces
(A)Deflection
(B) Shear stress
(C) Bending moment
(D)All of the above
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42. A beam of uniform strength is one which has same
(A) Shear force throughout the beam
(B) Bending moment throughout the beam
(C) Bending stress at every section
(D) Deflection throughout the beam
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43. Numerical control can be applied to
(A) Lathes
(B) Drilling machines
(C) Milling machines
(D) All of the above
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44. The specific fuel consumption per B.H.P hour for a diesel engine as compared to that of petrol engine is
(A) Higher
(B) Same
(C) Lower
(D) None of the above
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45. Maintenance of submersible pump is
(A)Tiresome
(B) Tiresome and expensive
(C) Easy
(D) Easy but expensive
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46. The Machinability of a material depends on
(A)Micro-structure
(B) Mechanical properties
(C) Chemical composition
(D) All of the above
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47. A practical lifting machine is based on the principle, so that it becomes
(A) Ideal machine
(B) Non-reversible machine
(C)Reversible machine
(D) None of the above
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48. Choose the correct statement
(A) In gear generating process both cutter and black rotate simultaneously
(B) In gear forming both blank and cutter remain stationary
(C) In gear hobbing the gear blank remain stationary while the cutter rotates
(D) In gear milling, Gear blank rotates while the cutter remains stationary.
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49. Which of the following is not a chip less machining process?
(A) Die casting
(B) Grinding
(C) Rolling
(D) Extruding
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50. The combination of peripheral and face milling operation is termed as
(A)End milling
(B) Face milling
(C) Peripheral milling
(D) Down milling
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51. In which processes steel is heated below the critical temperature?
(A) Normalizing
(B) Hardening
(C) Tempering
(D) Annealing
View Answer
52. Which one of the following operations cannot be performed by a drilling machine?
(A) Trepanning
(B) Counter boring
(C) Keyway cutting
(D) Spot fating
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53. The best method of obtaining a highly finished bore is
(A) Reaming
(B) Grinding
(B) Lapping
(D) Honing
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54. Rough surface of casting may result from
(A) High permeability of sand
(B) Soft ramming
(C) Large grain size
(D) Any of the above.
View Answer
55. A rack is a gear of
(A) Infinite pitch
(B) Infinity module
(C) Infinite diameter
(D) Infinite number of teeth
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56. NC machine tool is operated by
(A) Feed-back system
(B) Output-input modules
(C)A series of coded instructions
(D)None of the above.
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57. In case of spur gears, higher pressure angle results in
(A) Bigger size of gear teeth
(B) Weaker teeth
(C)Non-uniform motion transmission
(D)Wide base and stronger teeth
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58. In a center lathe, different spindle speeds are obtained from a gear box where provision for speeds is made in
(A) Cubical progression
(B) Square progression
(C) Arithmetical progression
(D) Geometrical progression
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59. The operation of sharpening a grinding wheel is called
(A) Bonding
(B) Aligning
(C) Truing
(D) Dressing.
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60. A cantilever of length carries a uniformly distributed load W kg per unit length for the whole length (L). The shear force at the free end will be
(A) WL2/2
(B) 0
(C) WL
(D) WL/2
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61. Hook’s law holds good up to
(A) Plastic limit
(B) Yield Point
(C) Proportional limit
(D) Elastic limit
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62. For a beam of length “I” simply supported at the ends with point load W at the center, the maximum bending moment the center is
(A)WL/8
(B)WL/6
(C)WL/2
( D )WL/4
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63. In air-conditioning, the mixing of two or steam of moist air follows
(A)Isothermal process
(B) Polytropic process
(C)Adiabatic process
(D) Constant
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64. In centerless grinding, the workpiece advances by
(A) Push given by operator
(B)Force exerted by regulating wheel
(C) Hydraulic force
(D) Force Exerted by grinding wheel
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65. What is the r.p.m. required for turning 56 mm workpiece on a lathe at 88 m/min in cutting speed
(A) 650
(B) 550
(C) 500
(D) 600
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66. Which of the following is used as working fluid vapor in vapor compression refrigerator
(A) Carbon dioxide
(B) Freon-12
(C) Ammonia
(D) All of the above
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67. The thermal efficiency of a two-stroke cycle engine as compared to four-stroke cycle engine is
(A) More
(B) Equal
(C)Less
(D) None of the above
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68. In orthogonal cutting system, the chip thickness is
(A) Minimum at the middle
(B) Maximum at the ends
(C)Maximum at the middle
(D) None of the above
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69. The thickness of the chip is maximum at the beginning of the cutting and minimum at the end of cutting in
(A) Face Milling
(B) Down Milling
(C)Conventional Milling
(D) Up Milling
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70. Which of the following process has the highest metal removal rate?
(A) Abrasive machining
(B) Electron beam machining
(C) Laser beam machining
(D) Ultrasonic machining
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71. During metal cutting operation on machine tools, the most of heat is carried away by
(A) Workpiece
(B) Chip
(C) Tool
(D) Chip and tool have identical heat dissipation
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72. The cutting tool in a milling machine is held in position by
(A) Knee
(B) Column
(C) Arbor
(D) Spindle
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73. Rankine’s formula is used for
(A) Both long and short columns
(B) Long columns
(C) Short column
(D) None of the above
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74. An axial load is applied on a circular section of diameter D. If the same load is applied on hollow circular section with inner diameter D/2, the ratio of the stress in two cases would be
(A) 4/3
(B) 1/2
(C) 3/4
(D) 1
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75. During air-conditioning of a space the sensible head added is 100 kcal/sec. and latent heat added is 50 kcal/sec then the sensible heat factor is given by
(A) 0.25
(B) 0.33
(C) 0.5
(D) 0.67
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76. In petrol engine, suction consists of
(A) Fuel only
(B) A mixture of all and fuel
(C) Air only
(D) None of the above
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77. If the load at the free end of a cantilever beam is increased, the failure will occur
(A) At the support
(B) At the free end
(C) Any where between free end and centre
(D) At the centre
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78. In case of belt drives, the effect of centrifugal tension is
(A) Not appreciable on driving power
(B) To increase the driving power
(C) To reduce the driving power
(D) Oependentori other factors
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79. The losses in an open channel vary
(A) Inversely proportional with a gradient
(B) with the velocity
(C) With the cube of the velocity
(D) With the square of the velocity
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80. A fixture used to
(A)Holds the tool
(B)Guides the tool
(C) None of above
(D) Holds the workpiece”
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81. Ignition quality of diesel fuel is expressed by
(A)Cetane number
(B) Calorific value
(C) Octane number
(D) Carbon percentage
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82. The screw jack gives maximum efficiency for helix angle(θ) is equal to
(A)π/4+Φ
(B) π/4-Φ
(C) π/4+Φ/2
(D) π/4-Φ/2
where o = angle of friction.
View Answer
83. Nickel added to copper increases
(A) Strength and hardness
(B) Strength
(C) Strength and ductility
(D) Hardness
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84. The advantage of CNC is
(A)Tape editing at the machine
(B) Flexibility
(C) Metric conversion
(D)All of the above
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85. A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is
(A) 40
(B) 5
(C) 10
(D) 20
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86. Lathe centres are provided with the following standard
(A) British
(B) Morse
(C) Metric
(D) Sharpe
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87. The coefficient of friction (H) in terms of angle friction (& ) is given by
(A) μ = 1 / tanΦ
(B) μ = sinΦ
(C) μ = tanΦ
(D) μ= tan-1(Φ)
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88. Bernoulli’s theorem deals with the law of conservation of
(A) Energy
(B) Momentum
(C) Mass
(D) None of the above
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89. Which type of compressor is commonly used in room air conditioner?
(A)Centrifugal
(B) Rotary
(C) Reciprocating
(D) None of the above
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90. In which of the following welding processes, the electrode is not consumed?
(A) Laser welding
(B) Plasma welding
(C) TIG welding
(D) Gas welding
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91. A beam fixed at both ends with a central load W in the middle will have zero bending moment at
(A)Three places
(B) Two places
(C) One place
(D) Four places
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92. The river flow during floods can be classified as
(A) Unsteady, uniform flow
(B) Unsteady non-uniform flow
(C) Steady uniform flow
(D) Steady non-uniform flow
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93. Tapping is an operation for
(A)Drilling
(B) Thread editing
(C) Counter boring
(D)Taper turning
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94. The process of supplying the intake air to engine cylinder at a density higher than the density of the surrounding atmosphere is known as
(A) Detonation
(B) Polymerization
(C) Scavenging
(D) Supercharging
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95. The power transmitted through a pipe is maximum when loss of head due to friction is given by (H=head supplied)
(A) H/3
(B) H/4
(C) H
(D)2H/3
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96. which one of the following is essential for accurate thread cutting on a lathe?
(A) Lead screw
(B) Follower rest
(C) Lathe
(D) Feed rod
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97. The loaded column fails due to
(A) Stress due to bending
(B) Stress due to direct load
(C) Both (A) & (B)
(D) None of the above
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98. Which one of the following is not a lathe part?
(A) Carriage
(B) Head stock
(C) Tail stock
(D) Clapper box
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99. Which information is required for specifying a grinding wheel?
(A) Type of bond
B) Grain size of Abrasive .
(C) Structure
(D) All of the above
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100. The value of J in the Equation T/J=f/y=Gθ/l for a solid circular rod of diameter D, will be
(A)πD3/32
(B) πD3/64
(C) πD4/64
(D)πD4/32
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