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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. Specific speed for reaction turbines ranges from

  2. A.

     0 to 4.5

    B.

     10 to 100

    C.

     80 to 200

    D.

     250 to 300

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  3. Resultant pressure of the liquid in the case of an immersed body acts through

  4. A.

     Centre of gravity

    B.

     Centre of pressure

    C.

     Metacentre

    D.

     Centre of buoyancy

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  5. Buoyant force is

  6. A.

     The resultant force acting on a floating body

    B.

     The resultant force on a body due to the fluid surrounding it

    C.

     Equal to the volume of liquid displaced

    D.

     The force necessary to maintain equilibrium of a submerged body

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  7. The ratio of the inertia force to the elastic force is called

  8. A.

     Reynold's number

    B.

     Froude's number

    C.

     Weber's number

    D.

     Mach number

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  9. The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

  10. A.

     Half the depth

    B.

     Half the breadth

    C.

     Twice the depth

    D.

     Twice the breadth

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  11. Specific weight of sea water is more that of pure water because it contains

  12. A.

     Dissolved air

    B.

     Dissolved salt

    C.

     Suspended matter

    D.

     All of the above

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  13. The gross or total head of the turbine is the ___________ of the water levels at the head race and tail race.

  14. A.

     Sum

    B.

     Difference

    C.

     Product

    D.

     None of these

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  15. In order to avoid cavitation in centrifugal pumps

  16. A.

     The suction pressure should be high

    B.

     The delivery pressure should be high

    C.

     The suction pressure should be low

    D.

     The delivery pressure should be low

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  17. The Francis formula for the discharge over Cipoletti weir is

  18. A.

     1.84 LH1/2

    B.

     1.84 LH

    C.

     1.84 LH3/2

    D.

     1.84 LH5/2

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  19. The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

  20. A.

     0.34 times

    B.

     0.67 times

    C.

     0.81 times

    D.

     0.95 times

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