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series reactors should have

high impedance
low resistance
high resistance
low impedance

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The relay operating coil is supplied through

current transformer
None of these
fuse
power transformer

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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is

12.5 A
3.125 A
6.25 A
25 A

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A fuse in a motor circuit provides protection against

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

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The arcing contacts in a circuit breaker are made of

porcelain
aluminium alloy
copper tungsten alloy
electrolytic copper

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

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

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