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Air blast circuit breaker is used for

short duty
repeated duty
over currents
intermittent duty

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The fuse wire, in DC circuit, is inserted in

negative circuit only
Both positive and negative circuit
positive circuit only
None of these

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Current chopping mainly occurs in

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

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For which of the following protection from negative sequence currents is provided ?

Transformers
Generators
Motors
Transmission line

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In a single bus-bar system there will be complete shut down when

fault occurs on the bus itself
fault occurs with respect to earthing
fault occurs on neutral line
two or more faults occur simultaneously

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

reactors
H.R. fuses
isolators
earth wires

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