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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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Insulation resistance of high voltage circuit breakers is more than

100 mega ohms
10 mega ohms
1 mega ohms
500 mega ohms

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When the circuit breaker operates under fault conditions, the greatest noise is produced in

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

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The time-current graph of a fuse

has inverse characteristic
None of these
has a linear characteristic
is a circle

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A fuse should have

low cost
high conductivity
low melting point
All of these

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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

300 A
100 A
200 A
more than 1000 A

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