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Power Systems

Power Systems
In nuclear power plants which material is/are used as coolant?

All of these
 graphite
 beryllium
 liquid sodium

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Power Systems
The insulator thickness on the conductor, in cables depends upon

 reactive power
 power factor
 current
 voltage

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Power Systems
Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching?

 SF6 CB.
 Oil CB.
 Air blast CB.
  Vacuum CB.

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Power Systems
a 50 Hz, 3-phase synchronous generator has inductance per phase of 15 mH. The capacitance of the generator and circuit breaker is 0.002 µF. What is its natural frequency?

 290 kHz
 29 kHz
 2.9 kHz
 29 MHz

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Power Systems
Deaerative heating is done to

 remove dissolved.
  remove dissolved gases in water.
 heat the feed water.
 heat the steam.

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Power Systems
The characteristic impedance of a transmission line is

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

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