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  • Question

  • 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

  • Correct Answer
  • No 

    • Hydraulic Machines problems

    Search Results

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

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.

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

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

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