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Directional relay are based on flow of

power
All of these
current
voltage wave

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The operating time of a circuit breaker is

0.05 sec
0.2 sec
0.001 sec
0.002 sec

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When a fault occur in a power system, the circuit breaker

None of these
is opened manually
is opened by remote control
opens automatically

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Wave trap is used to trap waves of

None of these
power frequencies
either of the above
higher frequencies entering generator or transformer units

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If the length of the arc in a circuit breaker increases, its resistance

None of these
increases
decreases
remains same

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SF 6 gas

is yellow in colour
has pungent small
Is nontoxic
is lighter than air

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