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An isolator is designed to open a circuit under

None of these
no load
normal conditions
full load

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A differential relay measures the vector difference between

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

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A fuse should have

low cost
high conductivity
low melting point
All of these

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An efficient and a well designed protective relaying should have

All of these
economy and simplicity
good selectivity and reliability
high speed and selectivity

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

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

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Minimum arcing voltage will be least in case of

tungsten
carbon
silver
graphite

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