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  • Question
  • The discharge of a centrifugal pump working under constant head __________ with the speed.


  • Options
  • A. increases
  • B. decreases

  • Correct Answer
  • increases 


  • Hydraulic Machines problems


    Search Results


    • 1. 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.

    • Options
    • A. True
    • B. False
    • Discuss
    • 2. In a Kaplan turbine runner, the number of blades are generally between

    • Options
    • A. 2 to 4
    • B. 4 to 8
    • C. 8 to l6
    • D. 16 to 24
    • Discuss
    • 3. Which of the following pump is preferred for flood control and irrigation applications?

    • Options
    • A. Centrifugal pump
    • B. Axial flow pump
    • C. Mixed flow pump
    • D. Reciprocating pump
    • Discuss
    • 4. Manometric head, in case of a centrifugal pump, is equal to

    • Options
    • 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
    • Discuss
    • 5. Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.

    • Options
    • A. diameter
    • B. square of diameter
    • C. cube of diameter
    • D. fourth power of diameter
    • Discuss
    • 6. Which of the following turbine is preferred for 0 to 25 m head of water?

    • Options
    • A. Pelton wheel
    • B. Kaplan turbine
    • C. Francis turbine
    • D. none of these
    • Discuss
    • 7. Work done by a turbine __________ upon the weight of water flowing per second.

    • Options
    • A. depends
    • B. does not depend
    • Discuss
    • 8. The principle of jet propulsion is used in driving the ships and aeroplanes.

    • Options
    • A. Correct
    • B. Incorrect
    • Discuss
    • 9. The power produced by the reaction turbine is __________ to the head of water.

    • Options
    • A. directly proportional
    • B. inversely proportional
    • Discuss
    • 10. The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as

    • Options
    • A. normal speed
    • B. unit speed
    • C. specific speed
    • D. none of these
    • Discuss


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