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  • Question

  • When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.


  • Options
  • A. Agree
  • B. Disagree

  • Correct Answer
  • Disagree 

    • Hydraulic Machines problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. A composite shaft consisting of two stepped portions having spring constants k1 and k2 is held between two rigid supports at the ends. Its equivalent spring constant is

    • Options
    • A.
    • B.
    • C.
    • D. k1+k2
      • Discuss
    • 5. A thick cylindrical shell having ro and ri as outer and inner radii, is subjected to an internal pressure (p). The maximum tangential stress at the inner surface of the shell is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. 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
    • 7. The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.

    • Options
    • A. product
    • B. difference
    • C. sum
      • Discuss
    • 8. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.

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

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

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