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Mechanical Engineering :: Theory of Machine

  1. The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)

  2. A.
    B.
    qI
    C.
    D.

  3. If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be

  4. A.
    four times the first one
    B.
    same as the first one
    C.
    one fourth of the first one
    D.
    one and a half times the first one

  5. The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where l = Number of links, and j = Number of binary joints)

  6. A.
    n = (l - 1) - j
    B.
    n = 2(l - 1) - 2j
    C.
    n = 3(l - 1) - 2j
    D.
    n = 4(l - 1) - 3j

  7. In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be

  8. A.
    less sensitive
    B.
    more sensitive
    C.
    unaffected of sensitivity
    D.
    isochronous

  9. The included angle for the V-belt is usually

  10. A.
    10° to 20°
    B.
    20° to 30°
    C.
    30° to 40°
    D.
    60° to 80°

  11. When two pulleys are connected by means of an open belt drive, then both the pulleys will rotate is opposite directions.

  12. A.
    Right
    B.
    Wrong

  13. A mechanism consisting of four links is called a __________ mechanism.

  14. A.
    simple
    B.
    compound

  15. The amplitude of vibration is always __________ the radius of the circle.

  16. A.
    equal to
    B.
    less than
    C.
    greater than

  17. An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

  18. A.
    tip of the gear tooth and flank of pinion
    B.
    tip of the pinion and flank of gear
    C.
    flanks of both gear and pinion
    D.
    tip of both gear and pinion

  19. In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is

  20. A.
    B.
    90°
    C.
    180°
    D.
    270°