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  • Question
  • 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

  • Correct Answer
  • fourth power of diameter 


  • Hydraulic Machines problems


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    • 1. The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

    • Options
    • A. slow speed with radial flow at outlet
    • B. medium speed with radial flow at outlet
    • C. high speed with radial flow at outlet
    • D. high speed with axial flow at outlet
    • Discuss
    • 2. The maximum number of jets, generally, employed in an impulse turbine without jet interference are

    • Options
    • A. two
    • B. four
    • C. six
    • D. eight
    • Discuss
    • 3. The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)

    • Options
    • A. L.A.N
    • B. 2 L.A.N
    • C.
    • D.
    • Discuss
    • 4. The efficiency of a Pelton wheel working under constant head __________ with the increase in power.

    • Options
    • A. remains same
    • B. increases
    • C. decreases
    • Discuss
    • 5. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. The discharge of a centrifugal pump working under constant head __________ with the speed.

    • Options
    • A. increases
    • B. decreases
    • Discuss


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