Hydraulic Machines MCQs with answers Page - 3

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Q. A Pelton wheel is

  • (A) tangential flow impulse turbine
  • (B) inward flow impulse turbine
  • (C) outward flow impulse turbine
  • (D) inward flow reaction turbine

A

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Q. Which of the following statement is correct?

  • (A) The centrifugal pump is suitable for large discharge and smaller heads
  • (B) The centrifugal pump required less floor area and simple foundation as compared to reciprocating pump
  • (C) The efficiency of centrifugal pump is less as compared to reciprocating pump.
  • (D) all of the above

A

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Q. The runaway speed of a hydraulic turbine is the speed

  • (A) at full load
  • (B) at which there will be no damage to the runner
  • (C) corresponding to maximum overload permissible
  • (D) at which the turbine will run freely without load

A

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Q. In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity.

  • (A) True
  • (B) False
  • (C) ---
  • (D) ---

A

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Q. The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is

  • (A) 24.8 r.p.m.
  • (B) 48.2 r.p.m.
  • (C) 82.4 r.p.m.
  • (D) 248 r.p.m.

A

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Q. In a reciprocating pump, air vessels are used to

  • (A) smoothen the flow
  • (B) reduce suction head
  • (C) increase delivery head
  • (D) reduce acceleration head

A

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Q. The capacity of a hydraulic accomulator is generally specified as the maximum amount of energy stored.

  • (A) True
  • (B) False
  • (C) ---
  • (D) ---

A

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Q. 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

  • (A) 0.25 kW
  • (B) 0.75 kW
  • (C) 1.75 kW
  • (D) 3.75 kW

A

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Q. In a reaction turbine, the pressure head of water, while flowing over the vanes, is converted into kinetic head before leaving the wheel.

  • (A) Agree
  • (B) Disagree
  • (C) ---
  • (D) ---

A

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Q. A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?

  • (A) Pelton wheel with one nozzle
  • (B) Pelton wheel with two or more nozzles
  • (C) Kaplan turbine
  • (D) Francis turbine

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