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  • Question

  • Which of the following statement is correct?


  • Options
  • A. In an impulse turbine, the water impinges on the buckets with pressure energy.
  • B. In a reaction turbine, the water glides over the moving vanes with kinetic energy.
  • C. In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
  • D. In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes.

  • Correct Answer
  • In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure. 

    • Hydraulic Machines problems

    Search Results

    • 1. The gross or total head of the turbine is the __________ of the water levels at the head race and tail race.

    • Options
    • A. sum
    • B. difference
    • C. product
      • Discuss
    • 2. The overall efficiency for a Pelton wheel lies between

    • Options
    • A. 0.50 to 0.65
    • B. 0.65 to 0.75
    • C. 0.75 to 0.85
    • D. 0.85 to 0.90
      • Discuss
    • 3. In an axial flow reaction turbine, the water flows __________ to the axis of the wheel.

    • Options
    • A. parallel
    • B. perpendicular
      • Discuss
    • 4. 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
    • 5. A Francis turbine is an outward flow reaction turbine.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. Braking jet in an impulse turbine is used

    • Options
    • A. to break the jet of water
    • B. to bring the runner to rest in a short time
    • C. to change the direction of runner
    • D. none of these
      • Discuss
    • 7. A hydraulic accumulator is a device used to store __________ energy which may be supplied to a machine later on.

    • Options
    • A. strain
    • B. pressure
    • C. kinetic
      • Discuss
    • 8. A reciprocating pump is also called a __________ displacement pump.

    • Options
    • A. positive
    • B. negative
      • Discuss
    • 9. The unit speed of the turbine runner is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 10. If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have

    • Options
    • A. geometric similarity
    • B. kinematic similarity
    • C. dynamic similarity
    • D. none of these
      • Discuss

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