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The device that detects the fault in a power system is

isolator
circuit breaker
relay
None of these

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The time-current graph of a fuse

has inverse characteristic
None of these
has a linear characteristic
is a circle

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An isolator is designed to open a circuit under

normal conditions
full load
no load
None of these

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A _______ is used to measure the stator % winding temperature of the generator.

thermocouple
resistance thermometer
thermometer
pyrometer

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A circuit breaker must perform the duty of

carrying fault current for a short time
opening the faulty circuit and breaking the fault current
being closed on to a fault
All of these

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Most of the relays on service on electric power system are

electro-mechanical relays
thermal relays
electronic relays
None of these

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