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series reactors should have

low impedance
high impedance
low resistance
high resistance

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Directional relay are based on flow of

voltage wave
current
power
All of these

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

more than 5A
5 A
1 A
2.5 A

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Relay can be designed to respond to changes in

All of these
voltage and current
temperature
resistance, reactance and impedance

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A fuse is never inserted in

positive of dc circuit
phase line
negative of dc circuit
neutral wire

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The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is

2
8
4
6

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