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  • Question

  • Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in metres, and Hd = Delivery head in metres)


  • Options
  • A. wQHs
  • B. wQHd
  • C. wQ(Hs - Hd)
  • D. wQ(Hs + Hd)

  • Correct Answer
  • wQ(Hs + Hd) 

    • Hydraulic Machines problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. Slip of a reciprocating pump is defined as the

    • Options
    • A. ratio of actual discharge to the theoretical discharge
    • B. sum of actual discharge and the theoretical discharge
    • C. difference of theoretical discharge and the actual discharge
    • D. product of theoretical discharge and the actual discharge
      • Discuss
    • 7. A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is

    • Options
    • A. 0.25 kW
    • B. 0.75 kW
    • C. 1.75 kW
    • D. 3.75 kW
      • Discuss
    • 8. The speed of a turbine runner 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
    • 9. The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

    • Options
    • A. 40%
    • B. 50%
    • C. 60%
    • D. 80%
      • Discuss
    • 10. Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

    • Options
    • A. directly proportional to N
    • B. inversely proportional to N
    • C. directly proportional to N2
    • D. inversely proportional to N2
      • Discuss

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