Hydraulic Machines MCQs with answers Page - 8

Here, you will find a collection of MCQ questions on Hydraulic Machines. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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A

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Q. The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

  • (A) slow speed pump with radial flow at outlet
  • (B) medium speed pump with radial flow at outlet
  • (C) high speed pump with radia flow at outlet
  • (D) high speed pump with axial flow at outlet

A

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Q. Power required to drive a centrifugal pump is directly proportional to

  • (A) diameter
  • (B) square of diameter
  • (C) cube of diameter
  • (D) fourth power of diameter

A

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Q. The cavitation in a hydraulic machine is mainly due to

  • (A) low velocity
  • (B) high velocity
  • (C) low pressure
  • (D) high pressure

A

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Q. The overall efficiency of a reaction turbine is the ratio of

  • (A) power produced by the turbine to the energy actually suppied by the turbine
  • (B) actual work available at the turbine to the energy imparted to the wheel
  • (C) workdone on the wheel to the energy (or head of water) actually supplied to the turbine
  • (D) none of the above

A

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Q. A Francis turbine is used when the available head of water is

  • (A) 0 to 25 m
  • (B) 25 m to 250 m
  • (C) above 250 m
  • (D) none of these

A

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Q. The cavitation in reaction turbines is avoided, to a great extent by

  • (A) installing the turbine below the tail race level
  • (B) using stainless steel runner of the turbine
  • (C) providing highly polished blades to the runner
  • (D) all of the above

A

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Q. A hydraulic intensifier is a device used to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure.

  • (A) Right
  • (B) Wrong
  • (C) ---
  • (D) ---

A

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Q. In a reaction turbine, the water enters the wheel under pressure and flows over the vanes.

  • (A) Correct
  • (B) Incorrect
  • (C) ---
  • (D) ---

A

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Q. The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship, will be maximum when the relative velocity of the jet and ship is equal to twice the velocity of the ship.

  • (A) Yes
  • (B) No
  • (C) ---
  • (D) ---

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