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  • Question

  • 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°

  • Correct Answer
  • 20° to 25° 

    • Hydraulic Machines problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. The maximum bending moment for the beam shown in the below figure, lies at a distance of __________ from the end B.

    • Options
    • A. l/2
    • B. l/3
    • C.
    • D.
      • Discuss
    • 5. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be

    • Options
    • A. 400 MPa
    • B. 500 MPa
    • C. 900 MPa
    • D. 1400 MPa
      • Discuss
    • 6. 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
    • 7. When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 8. 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
    • 9. 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
    • 10. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.

    • Options
    • A. Yes
    • B. No
      • Discuss

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