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Mechanical Engineering :: Theory of Machine

  1. The swaying couple is due to the

  2. A.
    primary unbalanced force
    B.
    secondary unbalanced force
    C.
    two cylinders of locomotive
    D.
    partial balancing

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  3. The lead screw of a lathe with nut forms a

  4. A.
    rolling pair
    B.
    sliding pair
    C.
    screw pair
    D.
    turning pair

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  5. In under damped vibrating system, if x1 and x2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to

  6. A.
    B.
    log
    C.
    loge
    D.
    log(x1.x2)

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  7. The angle of the inclined plane at which the body just begins to slide down the plane, is called helix angle.

  8. A.
    Right
    B.
    Wrong

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  9. In forced vibrations, the magnitude of damping force at resonance is equal to the impressed force.

  10. A.
    Correct
    B.
    Incorrect

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  11. When a slider moves on a fixed link having curved surface, their instantaneous centre lies

  12. A.
    on their point of contact
    B.
    at the centre of curvature
    C.
    at the centre of circle
    D.
    at the pin joint

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  13. Scotch yoke mechanism is used to generate

  14. A.
    sine functions
    B.
    square roots
    C.
    logarithms
    D.
    inversions

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  15. The unbalanced primary forces in a reciprocating engine are

  16. A.
    balanced completely
    B.
    balanced partially
    C.
    balanced by secondary forces
    D.
    not balanced

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  17. The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

  18. A.
    a single plane
    B.
    two planes
    C.
    three planes
    D.
    four planes

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  19. The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.

  20. A.
    less
    B.
    more
    C.
    same

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