Menu
Home / Mechanical Engineering / Hydraulic Machines :: Section 4

Mechanical Engineering :: Hydraulic Machines

Hydraulic Machines - Section 1
Hydraulic Machines - Section 2
Hydraulic Machines - Section 3
Hydraulic Machines - Section 4

  1. The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

    2. A.
    delivers unit discharge under unit head
    B.
    delivers unit discharge under unit speed
    C.
    develops unit power under unit head
    D.
    develops unit power under unit speed

    View Answer

    Workspace

    Discuss Discuss in Forum

  2. The runaway speed of a hydraulic turbine is the speed

    3. A.
    at full load
    B.
    at which there will be no damage to the runner
    C.
    corresponding to maximum overload permissible
    D.
    at which the turbine will run freely without load

    View Answer

    Workspace

    Discuss Discuss in Forum

  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

    View Answer

    Workspace

    Discuss Discuss in Forum

  4. The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

    5. A.
    slow speed pump with radial flow at outlet
    B.
    medium speed pump with radial flow at outlet
    C.
    high speed pump with radial flow at outlet
    D.
    high speed pump with axial flow at outlet

    View Answer

    Workspace

    Discuss Discuss in Forum

  5. If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

    6. A.
    no flow will take place
    B.
    cavitation will be formed
    C.
    efficiency will be low
    D.
    excessive power will be consumed

    View Answer

    Workspace

    Discuss Discuss in Forum

  6. A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is

    7. A.
    175.4 r.p.m.
    B.
    215.5 r.p.m.
    C.
    241.5 r.p.m.
    D.
    275.4 r.p.m

    View Answer

    Workspace

    Discuss Discuss in Forum

  7. The power of a centrifugal pump working under constant head and discharge increases with the speed.

    8. A.
    True
    B.
    False

    View Answer

    Workspace

    Discuss Discuss in Forum

  8. Which of the following pump is successfully used for lifting water to the turbines?

    9. A.
    Centrifugal pump
    B.
    Reciprocating pump
    C.
    Jet pump
    D.
    Air lift pump

    View Answer

    Workspace

    Discuss Discuss in Forum

  9. Which of the following is not a reaction turbine?

    10. A.
    Furneyron turbine
    B.
    Jonval turbine
    C.
    Thomson's turbine
    D.
    Pelton wheel

    View Answer

    Workspace

    Discuss Discuss in Forum

  10. A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is __________ of the jet velocity

    11. A.
    one-half
    B.
    one-third
    C.
    two-third
    D.
    three-fourth

    View Answer

    Workspace

    Discuss Discuss in Forum

Java Programming Questions and Answers Interview Questions and Answers