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A fuse element is generally made of

steel
silver
brass
iron

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Current chopping mainly occurs in

oil circuit breaker
air-blast circuit breaker
sf 6 circuit breaker
vaccum circuit breaker

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For the same power, the least size is of

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

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The short circuit in any winding of the transformer is the result of

insulation failure
impulse voltage
loose connection
mechanical vibration

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

isolators
earth wires
H.R. fuses
reactors

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With which of the following, a circuit breaker must be equipped for remote operation ?

shunt trip
time-delay trip
inverse time trip
None of these

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