Machine Design

91. The building up of worn and uridersized parts, subjected to repeated loads by electroplating is

  1. best method
  2. extremely hazardous
  3. has no effect as regards fatigue strength
  4. cheapest method
  5. all of the above.

Correct answer: (A)
best method

92. The connecting rod bolts are tightened up so that tightening stress

  1. is just sufficient to hold parts together
  2. approaches yield point
  3. is 50% of yield point
  4. is about yield point divided by safety factor
  5. none of the above.

Correct answer: (B)
approaches yield point

93. The connecting rod bolts are tightened up with initial tension greater than the external load so that

  1. joint may not open up
  2. bolts are weakest elements
  3. the resultant load on the bolt would not be affected by the external cyclic load
  4. bolts will not loosen during service
  5. none of the above.

Correct answer: (C)
the resultant load on the bolt would not be affected by the external cyclic load

94. The crest diameter of a screw thread is same as

  1. major diameter
  2. minor diameter
  3. pitch diameter
  4. core diameter
  5. none of the above.

Correct answer: (A)
major diameter

95. The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be

  1. 28
  2. 43869
  3. 48
  4. 43929
  5. none of the above.

Correct answer: (C)
48

96. The designation M 33 x 2 of a bolt means

  1. metric threads of 33 nos in 2 cm.
  2. metric threads with cross-section of 33 mm
  3. metric threads of 33 mm outside diameter and 2 mm pitch
  4. bolt of 33 mm nominal diameter having 2 threads per cm
  5. none of the above.

Correct answer: (C)
metric threads of 33 mm outside diameter and 2 mm pitch

97. The draw of cotter need not exceed

  1. 3 mm
  2. 5 mm
  3. 10 mm
  4. 20 mm
  5. 25 mm.

Correct answer: (A)
3 mm

98. The edges of a boiler plate are bevelled to an angle of

  1. 30°
  2. 45°
  3. 60°
  4. 80°
  5. 85°.

Correct answer: (D)
80°

99. The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for

  1. reducing stress concentration
  2. ease of manufacture
  3. safety
  4. fullering and caulking
  5. all of the above.

Correct answer: (D)
fullering and caulking

100. The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

  1. 0.25
  2. 0.45
  3. 0.55
  4. 0.65
  5. 0.75.

Correct answer: (E)
0.75.

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