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  • Question

  • Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.


  • Options
  • A. Right
  • B. Wrong

  • Correct Answer
  • Right 

    • Theory of machines problems

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    • 1. 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
    • 2. An automobile steering gear is an example of

    • Options
    • A. sliding pair
    • B. rolling pair
    • C. lower pair
    • D. higher pair
      • Discuss
    • 3. 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
    • 4. 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
    • 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. When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

    • Options
    • A. lower pair
    • B. higher pair
    • C. self-closed pair
    • D. force-closed pair
      • Discuss
    • 7. The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (?) is equal to

    • Options
    • A. 90° and 180°
    • B. 45° and 225°
    • C. 180° and 270°
    • D. 270° and 360°
      • Discuss
    • 8. The acceleration of the particle moving with simple harmonic motion is inversely proportional to the displacement of the particle from the mean position.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 9. The ratio of the actual damping coefficient to the critical damping coefficient is called damping factor.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 10. If ?/?n is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

    • Options
    • A. 0°
    • B. 90°
    • C. 180°
    • D. 360°
      • Discuss

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