Home / Mechanical Engineering / Hydraulic Machines :: Section 3

Mechanical Engineering :: Hydraulic Machines

  1. The function of guide vanes in a reaction turbine is to

  2. A.
    allow the water to enter the runner without shock
    B.
    allow the water to flow over them, without forming eddies
    C.
    allow the required quantity of water to enter the turbine
    D.
    all of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. Which of the following statement is correct ?

  4. A.
    In an impulse turbine, the water impinges on the buckets with pressure energy.
    B.
    In a reaction turbine, the water glides over the moving vanes with kinetic energy.
    C.
    In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
    D.
    In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes.

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. If the ratio of corresponding velocities at corresponding points are equal, then the model and the prototype are said to have dynamic similarity.

  6. A.
    Correct
    B.
    Incorrect

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. The jet ratio is defined as the ratio of the

  8. A.
    diameter of jet to the diameter of Pelton wheel
    B.
    velocity of jet to the velocity of Pelton wheel
    C.
    diameter of Pelton wheel to the diameter of jet
    D.
    velocity of Pelton wheel to the velocity of jet

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. Mechanical efficiency of a centrifugal pump is the ratio of

  10. 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

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. The cavitation in a hydraulic machine is mainly due to

  12. A.
    low velocity
    B.
    high velocity
    C.
    low pressure
    D.
    high pressure

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. The unit speed of the turbine runner is

  14. View Answer

    Workspace

    Discuss Discuss in Forum


  15. In a centrifugal pump, the regulating valve is provided on the

  16. A.
    casing
    B.
    delivery pipe
    C.
    suction pipe
    D.
    impeller

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. A Francis turbine is an outward flow reaction turbine.

  18. A.
    True
    B.
    False

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. A jet of water enters and leaves a fixed curved vane tangentially. The force of the jet along normal to the vane is (where α and β = Inlet and outlet angles of the jet respectively)

  20. View Answer

    Workspace

    Discuss Discuss in Forum