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The rated secondary current of current transformer for relays is generally

20 A
10 A
5 A
30 A

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A differential relay measures the vector difference between

two or more similar electrical quantities
None of these
two voltages
two currents

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The information to the circuit breaker under fault conditions is provided by

All of these
rewirable fuse
relay
H.R.'only

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The main function of a fuse is to

open the circuit
None of these
protect the line
prevent excessive currents
protect the appliance

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

None of these
zero
unity
infinity

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

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

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