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The arc voltage produced in AC circuit breaker is always

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

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Arc in a circuit breaker behaves as

a resistance increasing with voltage rise across the arc
a capacitive reactance
an inductive reactance
a resistance decreasing with voltage rise across the arc

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An isolator is installed

to operate the relay of circuit breaker
generally on both sides of a circuit breaker
as a substitute for circuit breaker
always independent of the position of circuit breaker

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