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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. The water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid, and H = Height of the liquid)

  2. A.

     wH/2

    B.

     wH

    C.

     wH2/2

    D.

     wH2/4

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  3. The cavitation in a hydraulic machine

  4. A.

     Causes noise and vibration of various parts

    B.

     Reduces the discharge of a turbine

    C.

     Causes sudden drop in power output and efficiency

    D.

     All of the above

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  5. The discharge over a triangular notch is

  6. A.

     Inversely proportional to H3/2

    B.

     Directly proportional to H3/2

    C.

     Inversely proportional to H5/2

    D.

     Directly proportional to H5/2

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  7. The time oscillation of a floating body with increase in meatcentric height will be

  8. A.

     Same

    B.

     Higher

    C.

     Lower

    D.

     Lower/higher depending on weight of body

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  9. If the surface of liquid is convex, men

  10. A.

     Cohesion pressure is negligible

    B.

     Cohesion pressure is decreased

    C.

     Cohesion pressure is increased

    D.

     There is no cohesion pressure

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  11. The coefficient of discharge for an external mouthpiece depends upon

  12. A.

     Velocity of liquid

    B.

     Pressure of liquid

    C.

     Area of mouthpiece

    D.

     Length of mouthpiece

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  13. The value of coefficient of discharge is __________ the value of coefficient of velocity.

  14. A.

     Less than

    B.

     Same as

    C.

     More than

    D.

     None of these

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  15. The pressure of a liquid measured with the help of a Piezometer tube is

  16. A.

     Vacuum pressure

    B.

     Gauge pressure

    C.

     Absolute pressure

    D.

     Atmospheric pressure

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  17. A body floating in a liquid is said to be in neutral equilibrium, if its metacentre

  18. A.

     Coincides with its centre of gravity

    B.

     Lies above its centre of gravity

    C.

     Lies below its centre of gravity

    D.

     Lies between the centre of buoyancy and centre of gravity

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  19. A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a

  20. A.

     Notch

    B.

     Weir

    C.

     Mouthpiece

    D.

     Nozzle

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