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Mechanical Engineering :: Theory of Machine

  1. When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

  2. A.
    simple pendulum
    B.
    compound pendulum
    C.
    torsional pendulum
    D.
    second's pendulum

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  3. Longitudinal vibrations are said to occur when the particles of a body moves

  4. A.
    perpendicular to its axis
    B.
    parallel to its axis
    C.
    in a circle about its axis
    D.
    none of these

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  5. The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

  6. A.
    ω(r1 - r2)sin θ
    B.
    ω(r1 + r2)sinθ sec2θ
    C.
    ω(r1 - r2)cos θ
    D.
    ω(r1 + r2)cos θ cosec2 θ

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  7. The sensitiveness of the governor __________ as the speed range decreases.

  8. A.
    remains unaffected
    B.
    decreases
    C.
    increases

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  9. In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

  10. A.
    50° - 60°
    B.
    60° - 70°
    C.
    70° - 80°
    D.
    80° - 90°

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  11. The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

  12. A.
    μ W R
    B.
    μ W R
    C.
    μ W R
    D.
    μ W R

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  13. If the damping factor for a vibrating system is unity, then the system will be

  14. A.
    over damped
    B.
    under damped
    C.
    critically damped
    D.
    without vibrations

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  15. In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the trans-missibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)

  16. A.
    less than unity
    B.
    equal to unity
    C.
    greater than unity
    D.
    zero

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  17. When a point at the end of a link moves with constant angular velocity, its acceleration will have

  18. A.
    radial component only
    B.
    tangential component only
    C.
    coriolis component only
    D.
    radial and tangential components both

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  19. The time taken by a particle for one complete oscillationis known as periodic time.

  20. A.
    Agree
    B.
    Disagree

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