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A differential relay measures the vector difference between
two currents
two voltages
two or more similar electrical quantities
None of these
two currents
two voltages
two or more similar electrical quantities
None of these
Answer
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The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be
100 A
300 A
more than 1000 A
200 A
100 A
300 A
more than 1000 A
200 A
Answer
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Air blast circuit breakers for 400 kV power system are designed to operate in
50 milli-second
0.1 sec
0.5 sec
100 micro-second
50 milli-second
0.1 sec
0.5 sec
100 micro-second
Answer
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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
electro-mechanical relays
thermal relays
electronic relays
None of these
Answer
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Arc in a circuit breaker behaves as
a resistance increasing with voltage rise across the arc
a capacitive reactance
an inductive reactance
a resistance decreasing with voltage rise across the arc
a resistance increasing with voltage rise across the arc
a capacitive reactance
an inductive reactance
a resistance decreasing with voltage rise across the arc
Answer
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Dc shunt relays are made of
many turns of thick wire
many turns of thin wire
few turns of thin wire
few turns of thick wire
many turns of thick wire
many turns of thin wire
few turns of thin wire
few turns of thick wire
Answer
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