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  • Question
  • If ?/?n = 2, where co is the frequency of excitation and ?n is the natural frequency of vibrations, then the transmissibility of vibration will the


  • Options
  • A. 0.5
  • B. 1
  • C. 1.5
  • D. 2

  • Correct Answer



  • Theory of machines problems


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    • 1. When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be

    • Options
    • A. minimum
    • B. zero
    • C. maximum
    • D. none of these
    • Discuss
    • 2. In a coupling rod of a locomotive, each of the four pairs is a __________ pair.

    • Options
    • A. sliding
    • B. turning
    • C. rolling
    • D. screw
    • Discuss
    • 3. The factor which affects the critical speed of a shaft is

    • Options
    • A. diameter of disc
    • B. span of shaft
    • C. eccentricity
    • D. all of these
    • Discuss
    • 4. The Whitworth quick return motion mechanism is formed in a slider crank chain when the

    • Options
    • A. coupler link is fixed
    • B. longest link is a fixed link
    • C. slider is a fixed link
    • D. smallest link is a fixed link
    • Discuss
    • 5. The gears are termed as medium velocity gears, if their peripheral velocity is

    • Options
    • A. 1 - 3 m/s
    • B. 3 - 15 m/s
    • C. 15 - 30 m/s
    • D. 30 - 50 m/s
    • Discuss
    • 6. The gear train usually employed in clocks is a

    • Options
    • A. simple gear train
    • B. reverted gear train
    • C. sun and planet gear
    • D. differential gear
    • Discuss
    • 7. When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be

    • Options
    • A. stable
    • B. unstable
    • C. isochronous
    • D. none of these
    • Discuss
    • 8. The static friction

    • Options
    • A. bears a constant ratio to the normal reaction between the two surfaces
    • B. is independent of the area of contact, between the two surfaces
    • C. always acts in a direction, opposite to that in which the body tends to move
    • D. all of the above
    • Discuss
    • 9. 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
    • 10. 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


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