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Mechanical Engineering :: Hydraulic Machines

  1. In a centrifugal pump, the water enters the impeller __________ and leaves the vanes axially.

  2. A.
    axially
    B.
    radially

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  3. A Kaplan turbine is an axial flow reaction turbine.

  4. A.
    Correct
    B.
    Incorrect

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  5. A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is

  6. A.
    10 r.p.m.
    B.
    20 r.p.m.
    C.
    40 r.p.m.
    D.
    80 r.p.m.

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  7. The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is __________ of the jet velocity,

  8. A.
    one-fourth
    B.
    one-half
    C.
    three-fourth
    D.
    double

    Answer: Option B

    Explanation:

    No answer description available for this question. Let us discuss.

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  • The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet.

  • A.
    equal to
    B.
    1.2 times
    C.
    1.8 times
    D.
    double

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  • An impulse turbine is used for

  • A.
    low head of water
    B.
    high head of water
    C.
    medium head of water
    D.
    high discharge

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  • The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship, will be maximum when the relative velocity of the jet and ship is equal to twice the velocity of the ship.

  • A.
    Yes
    B.
    No

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  • The cavitation in reaction turbines is avoided, to a great extent by

  • A.
    installing the turbine below the tail race level
    B.
    using stainless steel runner of the turbine
    C.
    providing highly polished blades to the runner
    D.
    all of the above

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  • Which type of the pump is different from others in the same group?

  • A.
    Screw pump
    B.
    Gear pump
    C.
    Cam and piston pump
    D.
    Plunger pump

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  • The power developed by a turbine is (where H = Head of water under which the turbine is working)

  • A.
    directly proportional to H1/2
    B.
    inversely proportional to H1/2
    C.
    directly proportional to H3/2
    D.
    inversely proportional to H3/2

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