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The relay operating coil is supplied through

current transformer
power transformer
None of these
fuse

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A circuit breaker is rated as 1500 A, 1000 MVA, 33 kv, 3-second , 3- phase oil circuit breaker. The rated normal current is

1500/√3 A
750 A
None of these
1500 A

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

operation time
clearing time
lag time
lead time

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To reduce short circuit fault currents......... are used.

None of these
resistors
reactors
capacitors

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A fuse in a motor circuit provides protection against

short-circuit and overload
overload
open circuit, short-circuit and overload
None of these

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

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

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