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Directional relay are based on flow of

All of these
power
voltage wave
current

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With which of the following, a circuit breaker must be equipped for remote operation ?

inverse time trip
shunt trip
None of these
time-delay trip

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SF6 gas

is lighter than air
is yellow in colour
has pungent small
None of these
is nontoxic

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Air blast circuit breakers for 400 kV power system are designed to operate in

0.5 sec
50 milli-second
100 micro-second
0.1 sec

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Series capacitors are used to

improve line voltage
compensate for line capacitive reactance
None of these
compensate for line inductive reactance

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Arc in a circuit breaker is interrupted at

maximum current
maximum voltage
minimum voltage
zero current

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