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An isolator is designed to open a circuit under

full load
None of these
normal conditions
no load

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The information to the circuit breaker under fault conditions is provided by

All of these
H.R.'only
relay
rewirable fuse

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Air blast circuit breaker is used for

repeated duty
short duty
over currents
intermittent duty

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

earth wires
isolators
reactors
H.R. fuses

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Overheating of relay contacts or contact born out is due to

foreign matter on the contact surface
too low contact pressure
slow making and breaking of load circuit contacts
all of these

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For interrupting of high voltage and low current, the circuit breaker prefered is

vaccum circuit breaker
oil circuit breaker
air-blast circuit breaker
all are correct

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