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Power Systems

Power Systems
In Francis turbine runner, the number blades is usually of the order of

 12 - 14.
 6 - 8.
 3 - 6.
  16 - 24.

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Power Systems
For variable heads of near about but less than 30 meters, which type of turbine is used in hydro power station?

None of these
 Kaplan
 Pelton
 Francis

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Power Systems
The annual depreciation of hydro power plant is about

 10 - 15 %.
 20 - 25 %.
 15 - 20 %.
  0.5 - 1.5 %.

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Power Systems
A 200 MVA alternator operated at no load at frequency of 50 Hz, it has inertia constant of 5 MWsec/MVA and governing system has a time delay of 0.6 sec. If the load of 50 MW is suddenly applied then find the frequency deviation during this time?

 0.76 Hz
 -0.85 Hz
 0.85 Hz
 -0.76 Hz

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Power Systems
For harnessing low variable water heads, the suitable hydraulic turbine with high percentage of reaction and runner adjust vanes is

  Francis.
  Pelton.
  Impeller.
  Kaplan.

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Power Systems
Which of the following rotor is used in thermal power plants?

 either of these
 squirrel cage rotor
 salient pole rotor
 cylindrical rotor

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