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Arc in a circuit breaker is interrupted at

zero current
minimum voltage
maximum voltage
maximum current

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To reduce short circuit fault currents......... are used.

None of these
resistors
reactors
capacitors

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The short circuit in any winding of the transformer is the result of

insulation failure
impulse voltage
loose connection
mechanical vibration

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series reactors should have

high resistance
low impedance
low resistance
high impedance

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The reflection co-efficient at the open circuited end of a transmission line

None of these
infinity
unity
zero

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