1. Which of the following materials has the maximum ductility?
Answer
Correct Answer:
Mild steel
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2. The contact ratio for gears is
Answer
Correct Answer:
Greater than one
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3. Which of the following bearings is preferred for oscillating conditions?
Answer
Correct Answer:
Needle roller bearing
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4. In most machine members, the damping capacity of the material should be
Answer
Correct Answer:
High
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5. Which of the following statements is wrong?
Answer
Correct Answer:
The pitch of the coil is the axial distance between adjacent coils in the compressed state
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6. Basic shaft is one
Answer
Correct Answer:
Whose upper deviation is zero
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7. Gears are casted by
Answer
Correct Answer:
Permanent mould casting
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8. The rocker arms in internal combustion engines are of __________.
Answer
Correct Answer:
First type levers
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9. A steel containing 0.8% carbon is known as
Answer
Correct Answer:
Eutectoid steel
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10. A steel containing up to 0.15% carbon is known as
Answer
Correct Answer:
Dead mild steel
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11. A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is
Answer
Correct Answer:
15 N-m
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12. Which of the following properties is desirable in parts subjected to shock and impact loads?
Answer
Correct Answer:
Toughness
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13. The fatigue life of a part can be improved by
Answer
Correct Answer:
Shot peening
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14. An alien bolt is
Answer
Correct Answer:
Provided with hexagonal depression in head
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15. The size of a gear is usually specified by
Answer
Correct Answer:
Pitch circle diameter
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16. Rivets are generally specified by
Answer
Correct Answer:
Nominal diameter
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17. Allen bolts are
Answer
Correct Answer:
Provided with hexagonal depression in head
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18. The resistance to fatigue of a material is measured by
Answer
Correct Answer:
Endurance limit
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19. Resistance to fatigue of a material is measured by
Answer
Correct Answer:
Endurance limit
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20. According to Indian standards, total numbers of fundamental deviations are
Answer
Correct Answer:
25
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21. In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because
Answer
Correct Answer:
The new belt will carry more than its share and result in short life
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22. A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,
Answer
Correct Answer:
Hollow saddle key
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23. The material generally used for aircraft components is
Answer
Correct Answer:
Aluminium
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24. Which of the following has threads at both ends?
Answer
Correct Answer:
Stud
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25. For tight leakage joints, following type of thread is best suited
Answer
Correct Answer:
NPT (national pipe threads)
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26. The rolling contact bearings as compared to sliding contact bearings have
Answer
Correct Answer:
Small overall dimensions
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27. Machine screws are
Answer
Correct Answer:
Slotted for a screwdriver and generally used with a nut
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28. A woodruff key is
Answer
Correct Answer:
Capable of tilting in a recess milled out in the shaft
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29. A tap bolt
Answer
Correct Answer:
Has head at one end and other end fits into a tapped hole in the other part to be joined
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30. A stud
Answer
Correct Answer:
Has both the ends threaded
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31. Which one of the following is a positive drive?
Answer
Correct Answer:
Chain drive
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32. A key way lowers
Answer
Correct Answer:
Both the strength and rigidity of the shaft
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33. Which of the following cotter joints will be used to connect the strap end of a connecting rod?
Answer
Correct Answer:
Gib and cotter joint
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34. Which of the following formulas is used in designing a connecting rod?
Answer
Correct Answer:
Rankine's formula
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35. The resultant axial load on a bolt depends on
Answer
Correct Answer:
All of the above
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36. A bolt
Answer
Correct Answer:
Has a head on one end and a nut fitted to the other
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37. According to Indian standard specifications, plain carbon steel designated by 40 C8 contains carbon
Answer
Correct Answer:
0.35 to 0.45%
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38. A bolt of M 24 × 2 means that
Answer
Correct Answer:
The nominal diameter of bolt is 24 mm and pitch is 2 mm
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39. The designation M 33 × 2 of a bolt means
Answer
Correct Answer:
Metric threads of 33 mm outside diameter and 2 mm pitch
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40. According to Indian standard specifications, a Grey cast iron designated by 'FG 200' means that the
Answer
Correct Answer:
Minimum tensile strength is 200 N/mm2
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41. A single strap butt joint is always in __________ shear.
Answer
Correct Answer:
Single
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42. A crankshaft is a __________ shaft.
Answer
Correct Answer:
Machine
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43. The V-belts are particularly suitable for __________ drives.
Answer
Correct Answer:
Short
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44. The expansion joint is mostly used for pipes which carry steam at __________ pressures.
Answer
Correct Answer:
High
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45. A riveted joint is a __________ fastening.
Answer
Correct Answer:
Permanent
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46. Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft The power transmitted by the shaft A will be __________ of shaft
Answer
Correct Answer:
Eight times
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47. In order to ensure self locking in a screw jack, it is essential that the helix angle is __________ friction angle.
Answer
Correct Answer:
Smaller than
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48. 18/8 steel contains
Answer
Correct Answer:
18% chromium and 8% nickel
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49. Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that
Answer
Correct Answer:
Shaft B is better than shaft A
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50. The acme threads are usually found on
Answer
Correct Answer:
Screw cutting lathes
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51. Buttress threads are usually found on
Answer
Correct Answer:
Railway carriage couplings
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52. Lewis equation in gears is used to find the
Answer
Correct Answer:
Compressive stress in bending
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53. In order to obtain bolt of uniform strength
Answer
Correct Answer:
Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
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54. The function of the washer is to
Answer
Correct Answer:
Provide bearing area
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55. The face of the tooth is the
Answer
Correct Answer:
Surface of the tooth above the pitch surface
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56. The flank of the tooth is the
Answer
Correct Answer:
Surface of the tooth below the pitch surface
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57. A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm2. If the permissible tensile stress in the metal is 20 N/mm2, then the thickness of the metal required for making the pipe will be
Answer
Correct Answer:
25 mm
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58. The form factor of a helical gear __________ with the increase in the helix angle.
Answer
Correct Answer:
Increases
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59. When a bolt is subjected to an external load, the stress induced in the bolt will be
Answer
Correct Answer:
Any one of these
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60. The notch angle of the Izod impact test specimen is
Answer
Correct Answer:
45°
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61. The centrifugal tension in belts
Answer
Correct Answer:
Increases the belt tension without increasing power transmission
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62. In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called
Answer
Correct Answer:
Axial pitch
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63. In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called
Answer
Correct Answer:
Normal pitch
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64. The ratio of pitch circle diameter in millimeters to the number of teeth, is called
Answer
Correct Answer:
Module
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65. A screw is specified by its
Answer
Correct Answer:
Major diameter
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66. The washer is generally specified by its
Answer
Correct Answer:
Hole diameter
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67. Taper on the cotter and slot is provided
Answer
Correct Answer:
On one side only
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68. According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by
Answer
Correct Answer:
2 mm for rivet diameter from 39 mm to 48 mm
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69. For low and moderate speed engines, the cam follower should move with
Answer
Correct Answer:
Simple harmonic motion
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70. For high speed engines, the cam follower should move with
Answer
Correct Answer:
Cycloidal motion
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71. A screw will be self locking, if
Answer
Correct Answer:
Friction angle is more than helix angle
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72. A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called
Answer
Correct Answer:
Ring nut
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73. The endurance limit of a material with finished surface in comparison to rough surface is
Answer
Correct Answer:
More
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74. A saddle key __________ power through frictional resistance only.
Answer
Correct Answer:
Transmits
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75. In case of pressure vessels having closed ends, the fluid pressure induces
Answer
Correct Answer:
Longitudinal stress
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76. In case of pressure vessels having open ends, the fluid pressure induces
Answer
Correct Answer:
Circumferential stress
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77. In standard taper roller bearings, the angle of taper of outer raceway is
Answer
Correct Answer:
25°
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78. In oiliness bearings
Answer
Correct Answer:
Do not require external supply of lubricant
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79. Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be
Answer
Correct Answer:
16
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80. When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is
Answer
Correct Answer:
Bending stress only
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81. Soderberg relation is based on __________ of the material whereas all other failure relations for dynamic loading are based on ultimate strength of the material.
Answer
Correct Answer:
Yield strength
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82. The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that
Answer
Correct Answer:
It is subjected to a higher cyclic loading than the outer side
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83. For circumferential joint in boilers, the type of joint used is
Answer
Correct Answer:
Lap joint with one ring overlapping the other
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84. For longitudinal joint in boilers, the type of joint used is
Answer
Correct Answer:
Butt joint with double cover plate
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85. A shaft is subjected to a maximum bending stress of 80 N/mm2 and maximum shearing stress equal to 30 N/mm2 at a particular section. If the yield point in tension of the material is 280 N/mm2 and the maximum shear stress theory of failure is used, then the factor of safety obtained will be
Answer
Correct Answer:
2.8
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86. The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.
Answer
Correct Answer:
Increases
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87. The draw of cotter should not be more than
Answer
Correct Answer:
3 mm
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88. According to I.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than
Answer
Correct Answer:
2 d
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89. According to I.R., the factor of safety of riveted joint should not be less than
Answer
Correct Answer:
4
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90. According to I.R., the thickness of the boiler shell should not be less than
Answer
Correct Answer:
7 mm
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91. The number of slots in a 25 mm castle nut is
Answer
Correct Answer:
6
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92. Belt slip may occur due to
Answer
Correct Answer:
All of the above
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93. The pipe joint mostly used for pipes carrying water at low pressures is
Answer
Correct Answer:
Socket joint
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94. In leaf springs, the longest leaf is known as
Answer
Correct Answer:
Master leaf
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95. A feather key is generally
Answer
Correct Answer:
Tight in shaft and loose in hub
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96. Auto frettage is the method of
Answer
Correct Answer:
Pre-stressing thick cylinders
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97. In block brakes, the ratio of shoe width to wheel diameter is taken between
Answer
Correct Answer:
0.25 and 0.50
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98. When the fulcrum is in between the load and effort, the lever is said to be of
Answer
Correct Answer:
First type
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99. The sleeve or muff coupling is designed as a
Answer
Correct Answer:
Hollow shaft
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100. A connecting rod is designed as a
Answer
Correct Answer:
Strut
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