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  • Question
  • 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

  • Correct Answer
  • lower pair 


  • Theory of machines problems


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

    • Options
    • A. Right
    • B. Wrong
    • Discuss
    • 2. 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
    • 3. An automobile steering gear is an example of

    • Options
    • A. sliding pair
    • B. rolling pair
    • C. lower pair
    • D. higher pair
    • Discuss
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. The ratio of the actual damping coefficient to the critical damping coefficient is called damping factor.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 9. 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
    • 10. The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ? = Angular speed of crank, r = Radius of crank, and ? = Angle of inclination of crank to the line of stroke)

    • Options
    • A. m.?2.r cos ?
    • B. c.m.?2.r sin ?
    • C. (1 - c)m.?2.r(cos ? - sin ?)
    • D. m.?2.r(cos ? - sin ?)
    • Discuss


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