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  • Question
  • An automobile steering gear is an example of


  • Options
  • A. sliding pair
  • B. rolling pair
  • C. lower pair
  • D. higher pair

  • Correct Answer
  • lower pair 


  • Theory of machines problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 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. 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
    • 6. 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
    • 7. Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.

    • Options
    • A. Right
    • B. Wrong
    • Discuss
    • 8. 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
    • 9. 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
    • 10. 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


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