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An isolator is installed
generally on both sides of a circuit breaker
always independent of the position of circuit breaker
to operate the relay of circuit breaker
as a substitute for circuit breaker
generally on both sides of a circuit breaker
always independent of the position of circuit breaker
to operate the relay of circuit breaker
as a substitute for circuit breaker
Answer
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A differential relay measures the vector difference between
two or more similar electrical quantities
two voltages
two currents
None of these
two or more similar electrical quantities
two voltages
two currents
None of these
Answer
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The making capacity of a circuit breaker is equal to
√3 × symmetrical breaking capacity
√2 × symmetrical breaking capacity
None of these
2.55 × symmetrical breaking capacity
√3 × symmetrical breaking capacity
√2 × symmetrical breaking capacity
None of these
2.55 × symmetrical breaking capacity
Answer
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Wave trap is used to trap waves of
power frequencies
None of these
higher frequencies entering generator or transformer units
either of the above
power frequencies
None of these
higher frequencies entering generator or transformer units
either of the above
Answer
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A short-circuit is identified by
voltage drop
no current flow
voltage rise
heavy current flow
voltage drop
no current flow
voltage rise
heavy current flow
Answer
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The operating time of a circuit breaker is
0.001 sec
0.002 sec
0.2 sec
0.05 sec
0.001 sec
0.002 sec
0.2 sec
0.05 sec
Answer
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