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POWER SYSTEMS

Power Systems
A buchholz relay is used for

 protection of a transformer against all internal faults
 protection of a transformer against all external faults
 both 1 and 2
 nether 1 nor 2

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Power Systems
What is the preferred type of circuit breaker(CB) to be installed in extra high voltage AC system?

 Air blast CB
 Sulphur hexafluoride CB
 Bulk oil type CB
 Vacuum CB

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Power Systems
Which of the following relays are used in protection of medium transmission lines?

 any of the above
 Impedance relays
 Admittance relays
 Mho relays

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Power Systems
Offset mho relay is used for the protection of equipment when

 failure of prime mover of the generator
 either 1 or 2
None of these
 loss of excitation of the generator

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Power Systems
In case of failure of prime mover of the generator, which type of relay is used?

 impedance relay
 reverse power relay
 offset mho relay
 distance relays

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