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Mechanical Engineering :: Hydraulic Machines

  1. The impeller of a centrifugal pump may have

  2. A.
    volute casing
    B.
    volute casing with guide blades
    C.
    vortex casing
    D.
    any one of these

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  3. Kinematic similarity is said to exist between the model and the prototype, if both of them

  4. A.
    have identical velocities
    B.
    are equal in size and shape
    C.
    are identical in shape, but differ only in size
    D.
    have identical forces

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  5. Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump)

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  7. A reciprocating pump is suitable for less discharge and higher heads.

  8. A.
    True
    B.
    False

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  9. The flow ratio of Francis turbine is defined as the ratio of the

  10. A.
    velocity of flow at inlet to the theoretical jet velocity
    B.
    theoretical velocity of jet to the velocity of flow at inlet
    C.
    velocity of runner at inlet to the velocity of flow at inlet
    D.
    none of the above

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  11. Dynamic similarity is said to exist between the model and the prototype, if both of them

  12. A.
    have identical velocities
    B.
    are equal in size and shape
    C.
    are identical in shape, but differ only in size
    D.
    none of the above

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  13. The specific speed of a turbine is given by the equation

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  15. A draft tube is used with impulse turbines.

  16. A.
    Yes
    B.
    No

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  17. A hydraulic ram is a device used to

  18. A.
    store the energy of water
    B.
    increase the pressure of water
    C.
    to lift water from deep wells
    D.
    to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height

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  19. Overall efficiency of a centrifugal pump is the ratio of

  20. A.
    energy available at the impeller to the energy supplied to the pump by the prime mover
    B.
    actual workdone by the pump to the energy supplied to the pump by the prime mover
    C.
    energy supplied to the pump to the energy available at the impeller
    D.
    manometric head to the energy supplied by the impeller per kN of water

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