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Power Systems

Power Systems
Merze price current scheme protection is used in

  both A and B.
  transformer.
  bus bars.
  alternator.

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Power Systems
In a 3-phase transmission line, each phase is supported by 3 insulated discs, maximum voltage of each disc is 20 kV. Find the operating voltage of the transmission line per phase if efficiency of string is 80.6%.

 52.84 kV
 48.36 kV
 83.76 kV
 20 kV

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Power Systems
What is the approximate efficiency of a normal thermal power station?

 45-55%
 20-25%
 60-70%
 30-40%

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Power Systems
In kaplan runner, the number of blades is generally of the order of

 1 - 2.
  16 - 24.
  3 - 6.
 12 - 16.

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Power Systems
For head and low discharge the water turbine used

 Francis turbine.
 propeller turbine.
  Pelton wheel.
 Kaplan wheel.

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Power Systems
Which of the following method is used for changing power factor from leading to lagging

 shunt capacitor
 series capacitor
 shunt reactor
 any of the above

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