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Home Mechanical Engineering Hydraulic Machines Comments

  • Question
  • The cavitation in a hydraulic machine is mainly due to


  • Options
  • A. low velocity
  • B. high velocity
  • C. low pressure
  • D. high pressure

  • Correct Answer
  • low pressure 


  • Hydraulic Machines problems


    Search Results


    • 1. The flow ratio in case of Francis turbine varies from

    • Options
    • A. 0.15 to 0.3
    • B. 0.4 to 0.5
    • C. 0.6 to 0.9
    • D. 1 to 1.5
    • Discuss
    • 2. The Thomson's turbine is __________ reaction turbine.

    • Options
    • A. an axial flow
    • B. an inward flow
    • C. an outward flow
    • D. a mixed flow
    • Discuss
    • 3. The efficiency of a hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger)

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 4. The discharge through a turbine is

    • Options
    • A. directly proportional to H1/2
    • B. inversely proportional to H1/2
    • C. directly proportional to H3/2
    • D. inversely proportional to H3/2
    • Discuss
    • 5. Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?

    • Options
    • A. Pelton wheel
    • B. Francis turbine
    • C. Kaplan turbine
    • D. none of these
    • Discuss
    • 6. The Furneyron turbine is __________ reaction turbine.

    • Options
    • A. an axial flow
    • B. an inward flow
    • C. an outward flow
    • D. a mixed flow
    • Discuss
    • 7. The head available at the inlet of the turbine is known as net or effective head.

    • Options
    • A. Correct
    • B. Incorrect
    • Discuss
    • 8. A Francis turbine is an outward flow reaction turbine.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?

    • Options
    • A. Hydraulic ram
    • B. Hydraulic intensifier
    • C. Hydraulic torque converter
    • D. Hydraulic accumulator
    • Discuss
    • 10. In an axial flow reaction turbine, the water flows __________ to the axis of the wheel.

    • Options
    • A. parallel
    • B. perpendicular
    • Discuss


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