Hydraulic Machines MCQs with answers Page - 13

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Q. A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero.

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

A

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Q. A Francis turbine is an outward flow reaction turbine.

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

A

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Q. The mechanical efficiency of an impulse turbine is

  • (A) ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
  • (B) ratio of the actual work available at the turbine to the energy imparted to the wheel
  • (C) ratio of the work done on the wheel to the energy of the jet
  • (D) none of the above

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Q. In a Francis turbine runner, the number of blades are generally between

  • (A) 2 to 4
  • (B) 4 to 8
  • (C) 8 to 16
  • (D) 16 to 24

A

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Q. The function of guide vanes in a reaction turbine is to

  • (A) allow the water to enter the runner without shock
  • (B) allow the water to flow over them, without forming eddies
  • (C) allow the required quantity of water to enter the turbine
  • (D) all of the above

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Q. If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

  • (A) no flow will take place
  • (B) cavitation will be formed
  • (C) efficiency will be low
  • (D) excessive power will be consumed

A

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Q. Manometric head is the actual head of water against which a centrifugal pump has to work

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

A

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Q. The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

  • (A) 40%
  • (B) 50%
  • (C) 60%
  • (D) 80%

A

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Q. Which of the following statement is correct?

  • (A) In an impulse turbine, the water impinges on the buckets with pressure energy.
  • (B) In a reaction turbine, the water glides over the moving vanes with kinetic energy.
  • (C) In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure
  • (D) In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes.

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