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POWER SYSTEMS

Power Systems
Which of the following is/are the stator faults?

All of these
 Inter phase faults
 failure of excitation
 over current

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Power Systems
Mho relays are used for the protection of which of the following lines?

 long transmission lines only
 medium transmission lines only
None of these
 short transmission lines only

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Power Systems
A thermal protection relay provides protection against what?

 any of the above
 Temperature
 Short circuit
 Over load

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Power Systems
Characteristics of arc quenching medium is/are

 High thermal conductivity
 High dielectric strength
All of these
 Non flammable

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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?

 29 kHz
 29 MHz
 2.9 kHz
 290 kHz

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