Machine Design MCQs with answers Page - 6

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. Bush bearings

  • (A) Phosphor bronze
  • (B) Aluminium bronze
  • (C) Mild steel
  • (D) White metal alloys

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Q. In a standard coarse thread bolt the stress concentration is maximum at

  • (A) Top surface
  • (B) Pitch circle
  • (C) Root
  • (D) All over the surface

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Q. In case of worm and worm-wheel the maximum efficiency is obtained when

  • (A) Worm is driver
  • (B) Worm wheel is driver
  • (C) Either of the worm or worm wheel is a driver
  • (D) Depends on other factors

A

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Q. When properly made, a butt weld has the strength equal to

  • (A) Double the tensile strength of plates
  • (B) Half the tensile strength of plates
  • (C) Half the compressive strength of plates
  • (D) The strength of the welded plates

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Q. In case of steels, as the percentage of carbon content increases

  • (A) Percentage elongation decreases
  • (B) Weldability increases
  • (C) Tensile strength decreases
  • (D) Hardness decreases

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Q. At the first critical speed a shaft will

  • (A) Remain straight
  • (B) Bend to the simplest shape possible
  • (C) Bend to maximum permissible depth
  • (D) Bend to the convex form

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Q. In order to reverse the direction of rotation of a 3-phase induction motor

  • (A) Motor should eb replaced
  • (B) Power factor should be changed
  • (C) Supply voltage should be cut off in one phase
  • (D) Any two phases should be interchanged

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Q. The basic hole is one which has

  • (A) Upper deviation as zero
  • (B) Lower deviation as zero
  • (C) Lower as well as upper deviation within narrow limits
  • (D) Lower as well as upper deviation are zero

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Q. In a Vee belt the angle between the sides is

  • (A) 30?
  • (B) 20?
  • (C) 60?
  • (D) 40?

A

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Q. Gerber line for failure criteria is in the form of a

  • (A) parabola
  • (B) Increasing the diameter of threaded portion
  • (C) straight line with negative slope
  • (D) straight line with positive slope

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