PU CET PG 2017 Question Paper M.E.Mechanical Engg. _Manufacturing Technology_

M.E.Mechanical Engg. (Manufacturing Technology)
1. To avoid interference the minimum number of teeth required on helical pinion
decreases as helix angle ________
A) Decreases
B) Increases
C) Does not affect number of teeth
D) None of the above

2. Which of the following elements is not used as a roller in roller bearings?
A) Cylindrical B) Taper
C) Spherical D) None of the above

3. Which of the following statements is/are true for V-belts?
A) V-belt drives have low reduction ratio
B) Due to wedging action slip is negligible in V-belts
C) V-belt transmits power over long centre distances
D) All of the above

4. The actual breaking stress in stress-strain diagram is the ratio of ______
A) Load at breaking point and original cross-sectional area
B) Load at breaking point and reduced cross-sectional area
C) Maximum load and original cross-sectional area
D) Yield load and original cross-sectional area

5. Two parallel, equal and opposite forces acting tangentially to the surface of the
body
is called as _____
A) Complementary stress B) Compressive stress
C) Shear stress D) Tensile stress

6. Which stress is induced in a member, when expansion or contraction due to
temperature variation is prevented?
A) Compressive stress B) Tensile stress
C) Thermal stress D) None of the above
7. The beam having one end free and one end fixed is called as _______
A) Cantilever beam B) Continuous beam
C) Overhang beam D) Simply supported beam
8. Uniformly varying load between two sections in shear force diagram is represented
by ______
A) Cubic curve B) Inclined line
C) Horizontal line D) Parabolic curve
9. Bending stress in the cross section of a shaft at the centre ________
A) Is zero
B) Decreases linearly to the maximum value of at outer surface
C) Both A and B
D) None of the above

10. The frictional torque transmitted in a flat pivot bearing, considering uniform
pressure, is (where µ = Coefficient of friction, W = Load over the bearing, and R =
Radius of bearing surface)
A) (1/2) µ W R B) (2/3) µ W R C) (3/4) µ W R D) µ W R

11. A typewriter mechanism has 7 numbers of binary joints, six links and none of
higher pairs. The mechanism is
A) Kinematically sound
B) Not sound
C) Soundness would depend upon which link is kept fixed
D) Data is not sufficient to determine same

12. If the opposite links of a four bar linkage are equal, the links will always form a
A) Triangle B) Rectangle C) Parallelogram D) Pentagon

13. Cam size depends upon
A) Base circle B) Pitch circle C) Prime circle D) Outer circle

14. In a drag link quick return mechanism, the shortest link is always fixed. The sum
of
the shortest and longest link is
A) Equal to sum of other two B) Greater than sum of other two
C) Less than sum of other two D) There is no such relationship

15. The ratio of height of Porter governor (when length of arms and links are equal)
to
the height of Watt's governor is (where m = Mass of the ball, and M = Mass on
the
sleeve)
A) m/(m + M) B) M/(m + M) C) (m + M)/m D) (m + M)/M

16. The operation of forcing additional air under pressure in the engine cylinder is
known as

A) Scavenging B) Turbulence C) Supercharging D) Pre- ignition

17. The mean effective pressure obtained from engine indicator indicates the
A) Maximum pressure developed B) Minimum pressure
C) Instantaneous pressure at any instant D) Average pressure

18. Which of the following medium is compressed in a Diesel engine cylinder?
A) Air alone B) Air and fuel
C) Air and lubricating oil D) Fuel alone

19. A stoichiometric air-fuel ratio is
A) Chemically correct mixture B) Lean mixture
C) Rich mixture for idling D) Rich mixture for over loads

20. The ratio of indicated thermal efficiency to the corresponding air standard cycle
efficiency is called

A) Net efficiency B) Efficiency ratio
C) Relative efficiency D) Overall efficiency

21. In a refrigeration system, the expansion device is connected between the
A) Compressor and condenser B) Condenser and receiver
C) Receiver and evaporator D) Evaporator and compressor

22. Rating of a domestic refrigerator in tons is of the order of
A) 0.1 B) 5 C) 10 D) 40

23. The bank of tubes at the back of domestic refrigerator is
A) Condenser tubes B) Evaporator tubes
C) Refrigerant cooling tubes D) Capillary tubes

24. The condition of refrigerant after passing through the condenser in a vapour
compression system is
A) Saturated liquid B) Wet vapour
C) Dry saturated vapour D) Superheated vapour

25. The rear teeth of a broach
A) Perform burnishing operation B) Remove minimum metal
C) Remove maximum metal D) Remove no metal

26. Small nose radius
A) Increases tool life
B) Decreases tool life
C) Produces chipping and decreases tool life
D) Results in excessive stress concentration and greater heat generation

27. The tap used to cut threads in a blind hole is
A) Taper tap B) Second tap
C) Bottoming tap D) Any one of these

28. The increase in depth of cut and feed rate _________ surface finish.
A) Improves B) Deteriorates C) Does not effect D) None of these

29. A drill mainly used in drilling brass, copper or softer materials, is
A) Flat drill
B) Straight fluted drill
C) Parallel shank twist drill
D) Tapered shank twist drill

30. The cutting tool in a milling machine is mounted on
A) Spindle B) Arbor C) Column D) Knee

31. The radial component of velocity for a particle moving in circular path is ______
A) Constant B) Radius itself C) Variable D) Zero

32. A stone undergoes projectile motion when thrown from top of the building. If it
strikes the ground surface at a distance away from the building then its

horizontal
direction is ___
A) Less than range B) More than range
C) Same as range D) Unpredictable
33. The ratio of effective length and least lateral dimension for short column is
_______
A) > 12 B) < 12 C) ≥ 12 D) None of the
above

34. Slenderness ratio is the ratio of effective length of column and ________
A) Lateral dimension of a column
B) Least radius of gyration of a column
C) Maximum radius of gyration of a column
D) None of the above

35. According to Coulomb's theory, material subjected to complex stresses fails, if
________ shear stress induced in the material exceeds _______ shear stress at the
yield point.
A) Minimum, maximum B) Maximum, minimum
C) Maximum, maximum D) Minimum, minimum

36. What is the product of sectional modulus and allowable bending stress called as?
A) Moment of inertia B) Moment of rigidity
C) Moment of resistance D) Radius of gyration

37. Transmissibility is the ratio of ______
A) Force transmitted to the supporting structure and force impressed upon the system
B) Displacement amplitude of mass and displacement amplitude of supporting
structure
C) Both A and B
D) None of the above

38. What is the head of water available at turbine inlet in hydro-electric power plant
called?
A) Head race B) Tail race C) Gross head D) Net
head

39. What is runaway speed of the runner of Pelton wheel?
A) Maximum unsafe speed of the runner due to sudden increase in load on turbine
B) Minimum safe speed of the runner due to sudden increase in load on turbine
C) Maximum unsafe speed of the runner due to sudden decrease in load on turbine
D) Minimum safe speed of the runner due to sudden decrease in load on turbine

40. Which of the following components of reaction turbine increases the head on the
turbine by an amount equal to the height of runner outlet above the tail race?
A) Scroll casing B) Guide vanes C) Moving vanes D) Draft tube

41. Discharge capacity of the reciprocating pump is __________ that of the
centrifugal

pump.
A) Higher than B) Lower than C) Same as D) Unpredictable

42. The process of filling the liquid into the suction pipe and pump casing upto the
level
of delivery valve is called as _________.
A) Filling B) Pumping C) Priming D) Leveling

43. The ratio of actual whirl velocity to the ideal whirl velocity in the centrifugal
compressor is called as _________.
A) Velocity factor B) Slip factor
C) Work factor D) None of the above
44. The motion of the cam is transferred to the valves through
A) Pistons B) Rocker arms C) Camshaft pulley D) Valve stems

45. In a single dry plate clutch, torsional vibrations are absorbed by
A) Coil springs known as torsional springs
B) Cushion springs
C) Central hub
D) Clutch pedal

46. A grinding wheel is said to be of _________ if the abrasive grains can be easily
dislodged.
A) Soft grade B) Medium grade C) Hard grade D) None of these

47. The high cutting speed and large rake angle of the tool will result in the
formation
of
A) Continuous chips B) Discontinuous chip
C) Continuous chips with built up edge D) None of these

48. In a shaper, the length of stroke is increased by
A) Increasing the centre distance of bull gear and crank pin
B) Decreasing the centre distance of bull gear and crank pin
C) Increasing the length of the arm
D) Decreasing the length of the slot in the slotted lever

49. Heat transfer takes place as per
A) Zeroth law of thermodynamics B) First law of thermodynamic
C) Second law of the thermodynamics D) Kirchoff's law

50. The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl
number is
A) Equal to one B) Greater than one
C) Less than one D) Equal to Nusselt number

51. The critical radius is the insulation radius at which the resistance to heat flow is
A) Maximum B) Minimum C) Zero D) None of these

52. Ram compression in turbojet involves

A) Reduction of speed of incoming air and conversion of part of it into pressure
energy
B) Compression of inlet air
C) Increasing speed of incoming air
D) Lost work

53. The maximum heat loss is a boiler occurs due to
A) Moisture in fuel B) Dry flue gases
C) Steam formation D) Unburnt carbon

54. It is required to produce large amount of steam at low pressure. Which boiler
should
be used?
A) Pulverized fuel fired boiler B) Cochran boiler
C) Lancashire boiler D) Babcock and Wilcox boiler
55. To prevent the body of the blade from jamming in the saw cut, the teeth of blade
are
A) Strengthened B) Sharpened C) Set D) All of these

56. The flux commonly used in brazing is
A) Zinc chloride B) Ammonium chloride
C) Resin plus alcohol D) Borax

57. Shift is a casting defect which
A) Results in a mismatching of the top and bottom parts of a casting
B) Results in general enlargement of a casting
C) Occurs near the ingates as rough lumps on the surface of a casting
D) Occurs as sand patches on the upper surface of a casting

58. In sheet metal work, cutting force on the tool can be reduced by
A) Grinding the cutting edges sharp B) Increasing the hardness of tool
C) Providing shear on tool D) Increasing the hardness of die

59. Which one among the following welding processes uses non-consumable
electrode?
A) Gas metal arc welding B) Submerged arc welding
C) Gas tungsten arc welding D) Flux coated arc welding

60. In DC arc welding, if leads are arranged in work as Negative pole of the welding
arc
and electrode as Positive pole of the welding arc, the arrangement is known as
A) Fusion B) Reverse polarity
C) Forward welding D) Direct polarity

61. In abrasive jet machining, as the distance between the nozzle tip and the work
surface increases, the material removal rate
A) Increases continuously
B) Decreases continuously
C) Decreases becomes stable and then increases
D) Increases, becomes stable and then decreases

62. During normalizing process of steel, the specimen is heated
A) Between the upper and lower critical temperature and cooled in still air.
B) Above the upper critical temperature and cooled in furnace.
C) Above the upper critical temperature and cooled in still air.
D) Between the upper and lower critical temperature and cooled in furnace.

63. The operation in which oil is permeated into the pores of a powder metallurgy
product is known as
A) Mixing B) Sintering C) Impregnation D)

Infiltration

64. The material property which depends only on the basic crystal structure is
A) Fatigue strength B) Work hardening
C) Fracture strength D) Elastic constant

65. Screws used for power transmission should have
A) Low efficiency B) High efficiency
C) Very fine threads D) Strong teeth

66. The fatigue life of a part can be improved by
A) Electroplating B) Polishing
C) Coating D) Shot peenin

67. Stress concentration in static loading is more serious in
A) Ductile materials B) Brittle materials
C) Equally serious in both cases D) Depends on other factors

68. Spiral gears are used only if the axes of two shafts are non-intersecting, non-
parallel
and __________.
A) Perpendicular B) Parallel
C) Non-perpendicular D) None of the above

69. What is the function of gudgeon pin?
A) Acts as stiffeners B) Supports piston head
C) Connects piston to connecting rod D) All of the above

70. Which criteria of failure is used to indicate St Venant's theory?
A) Maximum principal stress theory B) Maximum principal strain theory
C) Shear stress theory D) None of the above

71. The thermodynamic cycle on which the petrol engine works, is
A) Otto cycle B) Joule cycle
C) Rankine cycle D) Stirling cycle
72. The basic requirement of a good combustion chamber is
A) Minimum turbulence
B) Low compression ratio
C) High thermal efficiency and power output
D) Low volumetric efficiency

73. The output of a diesel engine can be increased without increasing the engine
revolution or size in following way
A) Feeding more fuel B) Heating incoming air
C) Scavenging D) Supercharging

74. The refrigerant for a refrigerator should have
A) High sensible heat B) High total heat
C) High latent heat D) Low latent heat

75. In a reversed Brayton cycle, the heat is absorbed by the air during
A) Isentropic compression process
B) Constant pressure cooling process
C) Isentropic expansion process
D) Constant pressure expansion process

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