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To limit short-circuit current in a power system are used

H.R. fuses
earth wires
isolators
reactors

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Circuit breakers usually operate under

steady state of short circuit current
after dc component has ceased
sub-transient state of short circuit current
transient state of short circuit current

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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is

6.25 A
12.5 A
3.125 A
25 A

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The fault that imposes severest duty on the circuit breaker is

line to line fault
line to ground fault
two lines to ground fault
all three lines short-circuited

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Relay can be designed to respond to changes in

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

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The single phasing relays are used for the protection of

three phase motors
two single phase motors running in parallel
single phase motors only
two phase motors only

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