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An isolator is designed to open a circuit under

None of these
no load
full load
normal conditions

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Outdoor switchgear is generally used for voltage beyond

66 kV
11 kV
33 kV
132 kV

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A fuse performs

circuit interruption function only
both detection and interruption functions
detection function only
None of these

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For the same power, the least size is of

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

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The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be

200 A
300 A
more than 1000 A
100 A

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The arcing contacts in a circuit breaker are made of

porcelain
copper tungsten alloy
aluminium alloy
electrolytic copper

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