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Arc in a circuit breaker is interrupted at

minimum voltage
maximum voltage
zero current
maximum current

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

resistors
None of these
reactors
capacitors

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

loose connection
insulation failure
impulse voltage
mechanical vibration

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series reactors should have

low impedance
high impedance
high resistance
low resistance

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

zero
None of these
unity
infinity

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