Hydraulic Machines MCQs with answers Page - 9

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Q. In the above question, the unit speed of the wheel is

  • (A) 10 r.p.m.
  • (B) 20 r.p.m.
  • (C) 40 r.p.m.
  • (D) 80 r.p.m.

A

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Q. The specific speed of a centrifugal pump may be defined as the speed of an imaginary pump, identical with the given pump, which will discharge one litre of water, while it is being raised through a head of one metre.

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

A

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Q. In a centrifugal pump, the water enters the impeller

  • (A) axially
  • (B) radially
  • (C) ---
  • (D) ---

A

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Q. In the above question, the saving in case of a double acting reciprocating pump is

  • (A) 39.20%
  • (B) 48.80%
  • (C) 84.80%
  • (D) 88.40%

A

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Q. The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

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

A

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Q. The hydraulic efficiency of a reaction turbine, is the ratio of

  • (A) power produced by the turbine to the energy actually supplied by the turbine
  • (B) actual work available at the turbine to 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

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Q. Kinematic similarity is said to exist between the model and the prototype, if both of them

  • (A) have identical velocities
  • (B) are equal in size and shape
  • (C) are identical in shape, but differ only in size
  • (D) have identical forces

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Q. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is

  • (A) 39.20%
  • (B) 48.80%
  • (C) 84.80%
  • (D) 88.40%

A

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Q. The power produced by the reaction turbine is

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

A

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Q. Braking jet in an impulse turbine is used

  • (A) to break the jet of water
  • (B) to bring the runner to rest in a short time
  • (C) to change the direction of runner
  • (D) none of the above

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