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The device that detects the fault in a power system is

isolator
relay
None of these
circuit breaker

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A differential relay measures the vector difference between

two voltages
None of these
two currents
two or more similar electrical quantities

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The current rating of a fuse is 5A. The fusing current will be

more than 5A
5 A
2.5 A
1 A

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For the same power, the least size is of

air-blast circuit breaker
sf6 circuit breaker
oil circuit breaker
vaccum circuit breaker

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The main function of a fuse is to

protect the line
None of these
protect the appliance
open the circuit
prevent excessive currents

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

thermocouple
pyrometer
thermometer
resistance thermometer

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