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Distance relays are generally

impedance relays
reactance relays
none of these
split-phase relays

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

infinity
zero
None of these
unity

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The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be

300 A
more than 1000 A
100 A
200 A

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For the protection of power station buildings against direct strokes the requirements are

None of these
interception, conduction and dissipation
interception
interception, conduction, dissipation and reflection
interception and conduction

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Series capacitors are used to

None of these
compensate for line capacitive reactance
compensate for line inductive reactance
improve line voltage

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

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

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