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Distance relays are generally

reactance relays
none of these
split-phase relays
impedance relays

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For interrupting of high voltage and low current, the circuit breaker prefered is

oil circuit breaker
all are correct
vaccum circuit breaker
air-blast circuit breaker

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The relay operating coil is supplied through

None of these
fuse
power transformer
current transformer

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The reflection co-efficient at the open circuited end of a transmission line

zero
unity
None of these
infinity

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Resistance grounding is used for voltage between

3.3 kV to 11 kv
None of these
33 kV to 66 kV
11 kv to 33 kv

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Which of the following CB's is generally used in railways applications ?

air break circuit breaker
low oil circuit breaker
sf 6 circuit breaker
bulk oil circuit breaker

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