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Power Systems

Power Systems
Breaking current is a ------------------ value?

 average
 RMS
 any of the above
 maximum

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Power Systems
The characteristic impedance of a transmission on line is

  Independent of its length.
 Directly proportional to square root of its length.
 Directly proportional to its length.
 Inversely proportional to its length.

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Power Systems
Advantages of pumped storage plants is/are

All of these
 used as load frequency control
 operating time is minimum
 most economical as a peak load supply plant

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Power Systems
In hydro power stations what is an enlarged body of water just above the intake and used as a regulating reservoir called

 Reservoir.
 Penstock.
  Fore bay.
 Spillways.

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 -2 - j 1 A
 1 + j 4 A
 1 + j 2 A
 5 + j 7 A

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Power Systems
Which turbine is ideally suited to pumped storage plants

 Impeller.
 Pelton.
  Kaplan.
 Francis.

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