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HRC fuses provide best protection against

reverse current
short circuits
overload
open circuits

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In a circuit breaker the time duration from the instant of the fault to extinction of arc is known as

clearing time
operation time
lag time
lead time

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For the same power, the least size is of

vaccum circuit breaker
air-blast circuit breaker
sf6 circuit breaker
oil circuit breaker

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Outdoor switchgear is generally used for voltage beyond

33 kV
66 kV
11 kV
132 kV

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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 device that detects the fault in a power system is

circuit breaker
relay
None of these
isolator

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