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Which of the following is used in liquid fuses ?
transformer oil
carbon tetrachloride
sulphur hexafluoride
distilled water
transformer oil
carbon tetrachloride
sulphur hexafluoride
distilled water
Answer
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Distance relays are generally
reactance relays
none of these
impedance relays
split-phase relays
reactance relays
none of these
impedance relays
split-phase relays
Answer
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A differential relay measures the vector difference between
two currents
two or more similar electrical quantities
None of these
two voltages
two currents
two or more similar electrical quantities
None of these
two voltages
Answer
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The current rating of a fuse is 5A. The fusing current will be
5 A
1 A
more than 5A
2.5 A
5 A
1 A
more than 5A
2.5 A
Answer
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The relay operating speed depends upon
armature core air gap
the spring tension
the rate of flux built up
All of these
armature core air gap
the spring tension
the rate of flux built up
All of these
Answer
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For the protection of power station buildings against direct strokes the requirements are
None of these
interception and conduction
interception, conduction, dissipation and reflection
interception, conduction and dissipation
interception
None of these
interception and conduction
interception, conduction, dissipation and reflection
interception, conduction and dissipation
interception
Answer
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