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Directional relay are based on flow of

voltage wave
All of these
power
current

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Insulation resistance of high voltage circuit breakers is more than

100 mega ohms
1 mega ohms
500 mega ohms
10 mega ohms

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Breaking capacity of a circuit breaker is usually expressed in terms of

volts
amperes
MVA
Mw

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A short-circuit is identified by

voltage rise
no current flow
heavy current flow
voltage drop

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The arc voltage produced in AC circuit breaker is always

None of these
lagging the arc current by 90°
In phase with the arc current
leading the arc current by 90°

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SF6 gas

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

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