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Hydraulic Machines problems

  • 1. The function of guide vanes in a reaction turbine is to

  • Options
  • A. allow the water to enter the runner without shock
  • B. allow the water to flow over them, without forming eddies
  • C. allow the required quantity of water to enter the turbine
  • D. all of the above
    • Discuss
  • 2. The number of buckets on the periphery of a Pelton wheel is given by

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 3. The undershot water wheels are those in which

  • Options
  • A. the wheel runs entirely by the weight of water
  • B. the wheel runs entirely by the impulse of water
  • C. the wheel runs partly by the weight of water and partly by the impulse of water
  • D. none of the above
    • Discuss
  • 4. A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?

  • Options
  • A. Pelton wheel with one nozzle
  • B. Pelton wheel with two or more nozzles
  • C. Kaplan turbine
  • D. Francis turbine
    • Discuss
  • 5. If the ratio of corresponding velocities at corresponding points are equal, then the model and the prototype are said to have dynamic similarity.

  • Options
  • A. Correct
  • B. Incorrect
    • Discuss
  • 6. The jet ratio is defined as the ratio of the

  • Options
  • A. diameter of jet to the diameter of Pelton wheel
  • B. velocity of jet to the velocity of Pelton wheel
  • C. diameter of Pelton wheel to the diameter of jet
  • D. velocity of Pelton wheel to the velocity of jet
    • Discuss
  • 7. In an impulse turbine, the pressure of water both at entering and leaving the vanes, is atmospheric.

  • Options
  • A. Agree
  • B. Disagree
    • Discuss
  • 8. The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 9. In an outward flow reaction turbine

  • Options
  • A. the water flows parallel to the axis of the wheel
  • B. the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
  • C. the water enters the wheel at the outer periphery and then flows towards the centre of the wheel
  • D. the flow of water is partly radial and partly axial
    • Discuss
  • 10. A jet of water enters and leaves a fixed curved vane tangentially. The force of the jet along normal to the vane is (where ? and ? = Inlet and outlet angles of the jet respectively)

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss

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