Hydraulic Machines MCQs with answers Page - 7

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A

Admin • 802.91K Points
Coach

Q. A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is

  • (A) 175.4 r.p.m.
  • (B) 215.5 r.p.m.
  • (C) 241.5 r.p.m.
  • (D) 275.4 r.p.m.

A

Admin • 802.91K Points
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Q. Which of the following trubine is preferred for 0 to 25 m head of water?

  • (A) Pelton wheel
  • (B) Kaplan turbine
  • (C) Francis turbine
  • (D) none of these

A

Admin • 802.91K Points
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Q. The overshot water wheels are those in which the wheel runs entirely by the

  • (A) weight
  • (B) impulse
  • (C) ---
  • (D) ---

A

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Q. In order to avoid cavitation in centrifugal pumps

  • (A) the suction pressure should be high
  • (B) the delivery pressure should be high
  • (C) the suction pressure should be low
  • (D) the delivery pressure should be low

A

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Q. Manometric head, in case of a centrifugal pump, is equal to

  • (A) Suction lift + Loss of head in suction pipe due to driction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe
  • (B) Workdone per kN of water - Losses within the impeller
  • (C) Energy per kN at outlet of impeller - Energy per kN at inlet of impeller
  • (D) all of the above

A

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Q. A hydraulic coupling belongs to the category of

  • (A) power absorbing machines
  • (B) power developing machines
  • (C) energy transfer machines
  • (D) energy generating machines

A

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Q. Overall efficiency of a centrifugal pump is the ratio of

  • (A) energy available at the impeller to the energy supplied to the pump by the prime mover
  • (B) actual workdone by the pump to the energy supplied to the pump by the prime mover
  • (C) energy supplied to the pump to the energy available at the impeller
  • (D) manometric head to the energy supplied by the impeller per kN of water

A

Admin • 802.91K Points
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Q. A hydraulic press is a device used

  • (A) to store pressure energy which may be supplied to a machine later on
  • (B) to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure
  • (C) to lift larger load by the application of a comparatively much smaller force
  • (D) all of the above

A

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Q. Power required to drive a centrifugal pump is

  • (A) directly
  • (B) inversely
  • (C) ---
  • (D) ---

A

Admin • 802.91K Points
Coach

Q. Slip of a reciprocating pump is defined as the

  • (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

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