logo

CuriousTab

CuriousTab

Discussion


Home Mechanical Engineering Hydraulic Machines Comments

  • Question
  • 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

  • Correct Answer
  • 0.85 to 0.90 


  • Hydraulic Machines problems


    Search Results


    • 1. In an axial flow reaction turbine, the water flows __________ to the axis of the wheel.

    • Options
    • A. parallel
    • B. perpendicular
    • Discuss
    • 2. 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
    • 3. A Francis turbine is an outward flow reaction turbine.

    • Options
    • A. True
    • B. False
    • Discuss
    • 4. The head available at the inlet of the turbine is known as net or effective head.

    • Options
    • A. Correct
    • B. Incorrect
    • Discuss
    • 5. The Furneyron turbine is __________ reaction turbine.

    • Options
    • A. an axial flow
    • B. an inward flow
    • C. an outward flow
    • D. a mixed flow
    • Discuss
    • 6. 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
    • 7. 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.
    • Discuss
    • 8. 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
    • 9. 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
    • 10. A reciprocating pump is also called a __________ displacement pump.

    • Options
    • A. positive
    • B. negative
    • Discuss


    Comments

    There are no comments.

Enter a new Comment