Machine Design MCQs with answers Page - 5

Here, you will find a collection of MCQ questions on Machine Design. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. If a spring is cut down into two springs, the stiffness of cut springs will be

  • (A) half
  • (B) same
  • (C) double
  • (D) unpredictable

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Q. If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited

  • (A) square
  • (B) acme
  • (C) buttress
  • (D) BSW

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Q. If an unsupported uniform cross sectional elastic bar is subjected to a longitudinal impact from a rigid bob moving with velocity v, then a compressive wave of intensity sc is propagated through the bar as follows

  • (A) vpE
  • (B) vVvF
  • (C) WpE/2
  • (D) IvHpE

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Q. 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

  • (A) 102 d
  • (B) 124 d
  • (C) 138 d
  • (D) 168 d

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Q. If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

  • (A) diameter of bolt
  • (B) 0.75 x diameter of bolt
  • (C) 1.25 x diameter of bolt
  • (D) 1.5 x diameter of bolt

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Q. If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

  • (A) 0.2
  • (B) 0.25
  • (C) 0.5
  • (D) 0.6

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Q. If threads on a bolt are left hand, threads on nut will be

  • (A) right hand with same pitch
  • (B) left hand with same pitch
  • (C) could be left or right hand
  • (D) right hand with fine pitch

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Q. If two springs are in parallel then their overall stiffness will be

  • (A) half
  • (B) same
  • (C) double
  • (D) unpredictable

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Q. In a horizontal flat belt drive for power transmission it is customary to use

  • (A) bottom side of the belt as slack side
  • (B) top side of the belt as slack side
  • (C) crossed-belting
  • (D) none of the above

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Q. Auto frettage is a

  • (A) extra cover provided on seamless pipes to increase their hoop stress
  • (B) a means of inducing favourable residual stresses in pressure vessels
  • (C) Increasing the diameter of threaded portion
  • (D) a heat treatment for pressure vessels subjected to low temperatures

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