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Most of the relays on service on electric power system are
None of these
electronic relays
electro-mechanical relays
thermal relays
None of these
electronic relays
electro-mechanical relays
thermal relays
Answer
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For interrupting of high voltage and low current, the circuit breaker prefered is
oil circuit breaker
vaccum circuit breaker
air-blast circuit breaker
all are correct
oil circuit breaker
vaccum circuit breaker
air-blast circuit breaker
all are correct
Answer
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To reduce short circuit fault currents......... are used.
resistors
capacitors
None of these
reactors
resistors
capacitors
None of these
reactors
Answer
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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is
25 A
12.5 A
3.125 A
6.25 A
25 A
12.5 A
3.125 A
6.25 A
Answer
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The fault that imposes severest duty on the circuit breaker is
line to ground fault
two lines to ground fault
all three lines short-circuited
line to line fault
line to ground fault
two lines to ground fault
all three lines short-circuited
line to line fault
Answer
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SF 6 gas
is yellow in colour
has pungent small
Is nontoxic
is lighter than air
is yellow in colour
has pungent small
Is nontoxic
is lighter than air
Answer
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