Hydraulic Machines MCQs with answers Page - 10

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A

Admin • 802.91K Points
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Q. Mechanical 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 sump 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

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Q. The impeller of a centrifugal pump may have

  • (A) volute casing
  • (B) volute casing with guide blades
  • (C) vortex casing
  • (D) any one of these

A

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Q. In a mixed flow reaction turbine, the flow of water is partly radial and partly axial.

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

A

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Q. The efficiency of a centrifugal pump will be maximum when the blades are bent backward.

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

A

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Q. The specific speed of a hydraulic turbine depends upon

  • (A) speed and power developed
  • (B) discharge and power developed
  • (C) speed and head of water
  • (D) speed, power developed and head of water

A

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Q. The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.

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

A

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Q. A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is

  • (A) one-half
  • (B) one-third
  • (C) two-third
  • (D) three-fourth

A

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Q. Slip of a reciprocating pump is negative, when

  • (A) suction pipe is short and pump is running at low speeds
  • (B) delivery pipe is long and pump is running at high speeds
  • (C) suction pipe is short and delivery pipe is long and the pump is running at low speeds
  • (D) suction pipe is long and delivery pipe is short and the pump is running at high speeds

A

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Q. The overall efficiency for a Pelton wheel lies between

  • (A) 0.50 to 0.65
  • (B) 0.65 to 0.75
  • (C) 0.75 to 0.85
  • (D) 0.85 to 0.90

A

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Q. Which of the following statement is wrong?

  • (A) The reaction turbines are used for low head and high discharge.
  • (B) The angle of taper on draft tube is less than 8?
  • (C) An impulse turbine is generally fitted slightly above the tail race.
  • (D) A Francis turbine is an impulse turbine.

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