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Mechanical Engineering :: Theory of Machine

  1. The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.

  2. A.
    greater than
    B.
    less than

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  3. In the two rotor system as shown in the below figure (I1 < I2), a node of vibration is situated

  4. A.
    between I1, and I2 but nearer I1
    B.
    between I1, and I2 but nearer to I2
    C.
    exactly in the middle of the shaft
    D.
    nearer to I1 but outside

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  5. For static balancing of a shaft, the net dynamic force acting on the shaft is equal to zero.

  6. A.
    Agree
    B.
    Disagree

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  7. A spring controlled governor is said to be unstable, if the relation between the controlling force (Fc) and radius of rotation (r) is Fc = ar.

  8. A.
    Agree
    B.
    Disagree

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  9. The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be

  10. A.
    to raise the bow and stern
    B.
    to lower the bow and stern
    C.
    to raise the bow and lower the stern
    D.
    to raise the stern and lower the bow

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  11. Most of the engines, generally, do not require balancing of secondary forces and couples.

  12. A.
    Right
    B.
    Wrong

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  13. The secondary unbalanced force is maximum __________ in one revolution of the crank.

  14. A.
    two times
    B.
    four times
    C.
    eight times
    D.
    sixteen times

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  15. A spring controlled governor is found unstable. It can be made stable by

  16. A.
    increasing the spring stiffness
    B.
    decreasing the spring stiffness
    C.
    increasing the ball mass
    D.
    decreasing the ball mass

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  17. In order to have a good grip on the pulley, the V-belt should touch the bottom of the groove in the pulley.

  18. A.
    True
    B.
    False

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  19. In order to double the period of a simple pendulum, the length of the string should be

  20. A.
    halved
    B.
    doubled
    C.
    quadrupled
    D.
    none of these

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