1. It is difficult to substitute aluminium for copper for windings of electrical machines. This is due to its
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both (a) and (b).
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2. Aluminium when used as a conductor material in large size transformer, it
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gives increased size and cost
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3. Aluminium when used as a conductor material in………. transformer reduces the overall cost of the transformer.
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small size
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4. .……… is universally used for windings of electrical machines.
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Annealed copper
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5. The basic needs of a good conducting material used for windings of electrical machines are
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all of the above
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6. The action of electromagnetic machines is based upon the principle(s) of
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all of these
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7. The design of mechanical parts is particularly important in case of ……… speed machines.
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high
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8. Commutation imposes limitation on
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dc motors
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9. Power factor imposes a limitation on motors.
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induction
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10. Limitation(s) imposed on the design is /are
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all of these
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11. The main areas of design are
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all of the above
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12. The major consideration(s) to evolve a good design is/are
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all of the above
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13. In designing a key, it is assumed that the distribution of forces along the length of key
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Is uniform throughout
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14. 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 hollow saddle key.
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Correct
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15. Which one of the following loading is considered for the design of axles?
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Bending moment only
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16. Rankine’s theory is used for
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Brittle materials
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17. The maximum shear stress theory is used for
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Ductile materials
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18. The resilience of a bolt may be increased by
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Increasing its length
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19. What does rolling contact bearings as compared to sliding contact bearings have
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All of the above
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20. What is the capacity of the bearing of heavy series over the medium series ?
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20 to 30%
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21. The rolling contact bearings are known as
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Antifriction bearings
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22. The acme threads are usually found on
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Screw cutting lathes
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23. Which type of welding is generally used in the automobile sector?
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Electric resistance welding
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24. In gas welding, which of the following is generally used?
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Oxygen-Hydrogen or Oxygen-Acetylene
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25. When spring index increases, the value of Wahl’s stress factor
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Increases exponentially
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26. Which of the following property is essential for spring materials?
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Resilience
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27. Which of the following spring is used in mechanical wrist watch?
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Torsion spring
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28. In leaf springs, the longest leaf is known as
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Master leaf
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29. The sleeve or muff coupling is designed as a
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Hollow shaft
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30. The size of a gear is usually specified by
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Pitch circle diameter
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31. When the fulcrum is in between the load and effort, the lever is said to be of
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First type
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32. The application of second type levers is found in
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Lever of a loaded safety valve
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33. The application of third type levers is found in
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Handle of a hand pump
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34. The taper on cotter varies from
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1 in 48 to 1 in 24
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35. The resistance to fatigue of a material is measured by
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Endurance limit
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36. The toughness of a material __________ when it is heated.
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Decreases
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37. The maximum normal stress theory is used for
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Brittle materials
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38. Surface endurance limit of gear material is dependent upon its
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Brinell hardness number
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39. The permissible stress for carbon steel under static loading is generally taken as
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4,000 - 4,500 kg/cm2
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40. When two non-intersecting and non-coplanar shafts are connected by gears, the arrangement is known as
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Spiral gearing
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41. Which of the following statements is correct?
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The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials
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42. A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statements is correct?
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There are five rivets per pitch length, out of which four are in double shear and one is in single shear
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43. The building up of worn and undersized parts, subjected to repeated loads by electroplating is
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Best method
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44. Which of the following screw threads is adopted for power transmission in either direction?
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Square threads
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45. The radial distance from the __________ to the clearance circle is called working depth.
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Addendum circle
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46. An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.
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One-eighth
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47. A chain drive transmits __________ power as compared to belt drive.
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More
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48. The edges of a boiler plate are bevelled to an angle of
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80°
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49. The shear stress at a point in a shaft subjected to a torque is
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Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
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50. When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is
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Shear stress
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51. The backlash for spur gears depends upon
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Both module and pitch line velocity
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52. A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called
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Hydrostatic lubricated bearing
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53. In a steam engine, the piston rod is usually connected to the cross-head by means of a
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Cotter joint
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54. If a material fails below its yield point, failure would be due to
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Fatigue
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55. When the screw in a mechanical screw jack rotates, the load kept on the top of it moves
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Axially upwards or downwards
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56. The radial distance of a tooth from the pitch circle to the top of the tooth is called
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Addendum
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57. In a transverse fillet welded joint, the size of weld is __________ the throat of weld
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2 times
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58. In a butt welded joint, the size of weld is __________ the throat of weld
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Equal to
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59. The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.
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One-third
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60. In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to
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Ensure uniform loading
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61. In case of V belt drive
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The belt should not touch the bottom of groove in the pulley
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62. The shear plane in case of bolts should
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Never be across the threaded portion
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63. In levers, leverage is the ratio of
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Effort arm to the load arm
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64. When a close coiled helical spring is compressed, its wire is subjected to
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Tension
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65. Which of the following screw threads is used for power transmission in one direction only?
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Buttress threads
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66. Plastic flow in ductile materials
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Lessens the seriousness of static loading stress concentration
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67. If a load W is applied instantaneously on a bar; Then the stress induced in bar will
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Be independent of ratio of mass of load W to mass of bar (y)
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68. If threads on a bolt are left hand, threads on nut will be
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Left hand with same pitch
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69. The dedendum is the radial distance from the
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Pitch circle to the bottom of a tooth
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70. The function of cutting oil when threading a pipe is to
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All of the above
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71. When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)
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D
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72. I.S. specifies following total number of grades of tolerances
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18
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73. According to I.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by
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Equating shearing resistance to the crushing resistance of the rivets
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74. According to I.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by
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Equating tearing resistance of the plate to the crushing resistance of the rivets
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75. The following type of nut is used with alien bolt
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Any one of the above
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76. In second type of levers,
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Load is in between the fulcrum and effort
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77. A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is
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3 kN-m
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78. In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of
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Combined effect of bending stress and curvature of the wire
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79. Wire ropes as compared to cotton ropes
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All of these
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80. A connecting rod subjected to an axial load may buckle with
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X-axis or Y-axis as neutral axis
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81. The stress induced in the belt is,
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Tensile stress
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82. Shaft coupling is used in machinery to
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All of these
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83. If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation
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168 d
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84. Stress concentration factor is defined as the ratio of
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Maximum stress to the nominal stress
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85. Which is the correct statement? Stress concentration in cyclic loading is
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Equally serious in both types of materials
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86. The value of stress concentration factor depends upon
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None of these
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87. Which of the following statements is correct, for two shafts connected in parallel?
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Angle of twist of each shaft is the same
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88. At low temperatures (say 75°C) the notched bar impact value of steel
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Decreases markedly
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89. While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as
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One end fixed and the other end free
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90. The shock resistance of steel is increased by adding
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Nickel and chromium
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91. Cold working
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Increases the fatigue strength
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92. In nitrated parts, the origins of the fatigue cracks will occur at
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None of the above
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93. The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called
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Backlash
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94. The included angle for the British Association thread is
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47.3°
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95. All stresses produced in a belt are
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Tensile stresses
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96. An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by
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All of the above
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97. In a steam engine, the valve rod is connected to an eccentric rod by means of
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Knuckle joint
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98. A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.
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Partially
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99. In a marine flange coupling, the pitch circle diameter of bolts is taken as
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1.6 d
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100. The process extensively used for making bolts and nuts is
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Cold heading
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101. The resultant axial load on a bolt depends upon
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All of the above
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102. In a multiple V-belt drive, if one of the belts break, then
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The entire set of belts is replaced
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103. The power transmitted by means of a belt depends upon
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All of the above
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104. Tapered roller bearings can take
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Both radial and axial loads and the ratio of these being greater than unity
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105. Basic hole is one
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Whose lower deviation is zero
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