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If the length of the arc in a circuit breaker increases, its resistance

decreases
remains same
None of these
increases

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The fusing factor is

always less than 1
always more than 1
always 1
None of these

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A fuse element is generally made of

brass
iron
silver
steel

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Interruption of large currents by relay requires

arc suppressing blow out coils
high speed opening of contacts
all of these
wide separation of the opened contacts

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

unity
zero
None of these
infinity

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Relay can be designed to respond to changes in

voltage and current
temperature
All of these
resistance, reactance and impedance

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