Machine Design

61. In order to permit the thermal expansion/contraction of tubing, it should be

  1. crimped
  2. honed
  3. flared
  4. bent
  5. none of the above.

Correct answer: (D)
bent

62. In standard taper roller bearings, the angle of taper of outer raceway is

  1. 5°
  2. 8°
  3. 15°
  4. 25°
  5. 40°.

Correct answer: (D)
25°

63. In testing a material for endurance strength, it is subjected to

  1. static load
  2. dynamic load
  3. impact load
  4. static as well as dynamic load
  5. completely reversed load.

Correct answer: (E)
completely reversed load.

64. In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

  1. decreasing the cross-section area of' bar
  2. increasing the cross-section area of bar
  3. remain unaffected with cross-section area
  4. would depend upon other factors
  5. none of the above.

Correct answer: (A)
decreasing the cross-section area of' bar

65. In V-belt drive, belt touches

  1. at bottom
  2. at sides only
  3. both at bottom and sides
  4. could touch anywhere
  5. none of the above.

Correct answer: (B)
at sides only

66. In Vicker's hardness testing, the pyramid indentor apex is

  1. 40°
  2. 122°
  3. 136°
  4. 152°
  5. 161°.

Correct answer: (C)
136°

67. Jam nut is a locking device in which

  1. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
  2. a slot is cut partly in middle of nut and then slot reduced by tightening a screw
  3. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
  4. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end
  5. none of the above.

Correct answer: (A)
one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

68. Machine screws are

  1. similar to small size tap bolts except that a greater variety of shapes of heads are available
  2. slotted for a screw driver and generally used with a nut
  3. used to prevent relative motion be-tween two parts
  4. similar to stud
  5. none of the above.

Correct answer: (B)
slotted for a screw driver and generally used with a nut

69. Maximum principal stress theory is applicable for

  1. ductile materials
  2. brittle materials
  3. elastic materials
  4. all of the above
  5. none of the above.

Correct answer: (B)
brittle materials

70. Oil in journal bearing should be applied at the point where load is

  1. nil or lightest
  2. maximum
  3. average
  4. any one of the above
  5. unpredictable.

Correct answer: (A)
nil or lightest

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