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Mechanical Engineering :: Hydraulic Machines

  1. The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as

  2. A.
    normal speed
    B.
    unit speed
    C.
    specific speed
    D.
    none of these

  3. For centrifugal pump impeller, the maximum value of the vane exit angle is

  4. A.
    10° to 15°
    B.
    15° to 20°
    C.
    20° to 25°
    D.
    25° to 30°

  5. In a reaction turbine, the pressure head of water, while flowing over the vanes, is converted into kinetic head before leaving the wheel.

  6. A.
    Agree
    B.
    Disagree

  7. Manometric head, in case of a centrifugal pump, is equal to

  8. A.
    Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe
    B.
    Workdone per kN of water - Losses within the impeller
    C.
    Energy per kN at outlet of impeller - Energy per kN at inlet of impeller
    D.
    all of the above

  9. The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is


  10. In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity.

  11. A.
    True
    B.
    False

  12. The capacity of a hydraulic accumulator is generally specified as the maximum amount of energy stored.

  13. A.
    True
    B.
    False

  14. The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

  15. A.
    40%
    B.
    50%
    C.
    60%
    D.
    80%

  16. The breast water wheels are those in which the wheel runs partly by the weight of water and partly by the impulse of water.

  17. A.
    True
    B.
    False

  18. The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as

  19. A.
    manometric efficiency
    B.
    mechanical efficiency
    C.
    overall efficiency
    D.
    volumetric efficiency