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Hydraulic Machines problems

  • 1. Multi-stage centrifugal pumps are used to

  • Options
  • A. give high discharge
  • B. produce high heads
  • C. pump viscous fluids
  • D. all of these
    • Discuss
  • 2. The breast water wheels are those in which the wheel runs partly by the weight of water and partly by the impulse of water.

  • Options
  • A. True
  • B. False
    • Discuss
  • 3. The ratio of actual work available at the turbine to the energy imparted to the wheel is known as __________ efficiency.

  • Options
  • A. hydraulic
  • B. mechanical
  • C. overall
    • Discuss
  • 4. A hydraulic coupling belongs to the category of

  • Options
  • A. power absorbing machines
  • B. power developing machines
  • C. energy transfer machines
  • D. energy generating machines
    • Discuss
  • 5. The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle ? with the jet is

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 6. In a reaction turbine, the pressure head of water, while flowing over the vanes, is converted into kinetic head before leaving the wheel.

  • Options
  • A. Agree
  • B. Disagree
    • Discuss
  • 7. A Francis turbine is used when the available head of water is

  • Options
  • A. 0 to 25 m
  • B. 25 m to 250 m
  • C. above 250 m
  • D. none of these
    • Discuss
  • 8. A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 9. Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)

  • Options
  • A. Q = ?.D.Vf
  • B. Q = ?.b.Vf
  • C. Q = ?.D.b.Vf
  • D. Q = D.b.Vf
    • Discuss
  • 10. The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as

  • Options
  • A. manometric efficiency
  • B. mechanical efficiency
  • C. overall efficiency
  • D. volumetric efficiency
    • Discuss

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