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  • Question
  • The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.


  • Options
  • A. product
  • B. difference
  • C. sum

  • Correct Answer
  • sum 


  • Hydraulic Machines problems


    Search Results


    • 1. The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 2. When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.

    • Options
    • A. Agree
    • B. Disagree
    • Discuss
    • 3. The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is

    • Options
    • A. 24.8 r.p.m.
    • B. 48.2 r.p.m
    • C. 82.4 r.p.m.
    • D. 248 r.p.m
    • Discuss
    • 4. For centrifugal pump impeller, the maximum value of the vane exit angle is

    • Options
    • A. 10° to 15°
    • B. 15° to 20°
    • C. 20° to 25°
    • D. 25° to 30°
    • Discuss
    • 5. In the casing of a centrifugal pump, the kinetic energy of the water is converted into pressure energy before the water leaves the casing.

    • Options
    • A. True
    • B. False
    • Discuss
    • 6. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 7. The efficiency of a Pelton wheel working under constant head __________ with the increase in power.

    • Options
    • A. remains same
    • B. increases
    • C. decreases
    • Discuss
    • 8. 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
    • 9. 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
    • 10. 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


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