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Power Systems

Power Systems
Which of the following materials is/are used as moderators?

All of these
 graphite
 heavy water
 beryllium

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Power Systems
Where air circuit breakers are used?

  Up to 33 kV.
  Up to 66 kV.
  Up to 11 kV.
  Up to 12 kV.

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Power Systems
Gas turbine power plants for maximum efficient may have

 Multistage compression.
 Reheating.
 Heat exchangers.
  All of above.

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Power Systems
The corona loss on a particular system at 60 Hz is 1 kW/km per phase. What is the corona loss at 50 Hz in kW/km per phase?

 0.93
 1.13
 0.882
 1

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Power Systems
Three generators rated 100 MVA, 11 kV have an impedance of 0.15 pu each. If in the same plant, these generators are being replaced by a single equivalent generator, the effective impedance of equivalent generator will be

 0.05 pu
 0.15 pu
 0.25 pu
 0.45 pu

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Power Systems
Generation of of one watt needs about ______________ fission per second

 3.1 × 106.
 3.1.
  3.1 × 1010.
 3.1 × 107.

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