Hydraulic Machines MCQs with answers Page - 22

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Q. The flow ratio in case of Francis turbine varies from ?

  • (A) 0.15 to 0.3
  • (B) 0.4 to 0.5
  • (C) 0.6 to 0.9
  • (D) 1 to 1.5

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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

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Q. Which of the following is not a reaction turbine ?

  • (A) Furneyron turbine
  • (B) Jonval turbine
  • (C) Thomson's turbine
  • (D) Pelton wheel

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Q. In an outward flow reaction turbine ?

  • (A) the water flows parallel to the axis of the wheel
  • (B) the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
  • (C) the water enters the wheel at the outer periphery and then flows towards the centre of the wheel
  • (D) the flow of water is partly radial and partly axial

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Q. The jet ratio is defined as the ratio of the ?

  • (A) diameter of jet to the diameter of Pelton wheel
  • (B) velocity of jet to the velocity of Pelton wheel
  • (C) diameter of Pelton wheel to the diameter of jet
  • (D) velocity of Pelton wheel to the velocity of jet

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. 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 ......... of the jet velocity ?

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

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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 %

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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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Q. The overall 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 the energy imparted to the wheel
  • (C) work done on the wheel to the energy (or head of water) actually supplied to the turbine
  • (D) none of the above

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