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The operating time of a fuse is about

1 sec
0.8 sec
0.002 sec
1.5 sec

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Directional relay are based on flow of

voltage wave
All of these
power
current

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The current rating of a fuse is 5A. The fusing current will be

5 A
2.5 A
more than 5A
1 A

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A differential relay measures the vector difference between

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

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An isolator is designed to open a circuit under

normal conditions
no load
None of these
full load

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The relay operating coil is supplied through

power transformer
None of these
fuse
current transformer

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