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Theory of machines problems

  • 1. The pair is known as a higher pair, when the relative motion between the elements of a pair is

  • Options
  • A. turning only
  • B. sliding only
  • C. rolling only
  • D. partly turning and partly sliding
    • Discuss
  • 2. In a screw jack, the effort required to lower the load W is given by

  • Options
  • A. P = W tan(? - ?)
  • B. P = W tan(? + ?)
  • C. P = W tan(? - ?)
  • D. P = W cos(? + ?)
    • Discuss
  • 3. When the connection between the two elements is such that only required kind of relative motion occurs, it is known as self-closed pair.

  • Options
  • A. Right
  • B. Wrong
    • Discuss
  • 4. In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon

  • Options
  • A. total lift, total angle of lift, minimum radius of cam and cam speed
  • B. radius of circular arc, cam speed, location of centre of circular arc and roller diameter
  • C. mass of cam follower linkage, spring stiffness and cam speed
  • D. total lift, centre of gravity of the cam and cam speed
    • Discuss
  • 5. The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ?1 rad/s in the clockwise direction and the link OB turns with angular velocity ?2 rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

  • Options
  • A. ?1.?2.r
  • B. ( ?1 - ?2)r
  • C. ( ?1 + ?2)r
  • D. ( ?1 - ?2)2r
    • Discuss
  • 6. The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations.

  • Options
  • A. more than
  • B. less than
  • C. same as
    • Discuss
  • 7. In order to balance the reciprocating masses,

  • Options
  • A. primary forces and couples must be balanced
  • B. secondary forces and couples must be balanced
  • C. both (a) and (b)
  • D. none of these
    • Discuss
  • 8. An automobile steering gear is an example of

  • Options
  • A. sliding pair
  • B. rolling pair
  • C. lower pair
  • D. higher pair
    • Discuss
  • 9. The dynamic friction is the friction experienced by a body, when the body

  • Options
  • A. is in motion
  • B. is at rest
  • C. just begins to slide over the surface of the other body
  • D. none of the above
    • Discuss
  • 10. Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.

  • Options
  • A. Right
  • B. Wrong
    • Discuss

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