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protection of fuses is generally not used beyond

100 A
200 A
20 A
50 A

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Distance relays are generally

reactance relays
impedance relays
split-phase relays
none of these

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In a single bus-bar system there will be complete shut down when

fault occurs on neutral line
fault occurs with respect to earthing
two or more faults occur simultaneously
fault occurs on the bus itself

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Air blast circuit breaker is used for

intermittent duty
short duty
over currents
repeated duty

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A circuit breaker must perform the duty of

being closed on to a fault
opening the faulty circuit and breaking the fault current
All of these
carrying fault current for a short time

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Relay can be designed to respond to changes in

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

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