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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is
6.25 A
3.125 A
12.5 A
25 A
6.25 A
3.125 A
12.5 A
25 A
Answer
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Insulation resistance of high voltage circuit breakers is more than
500 mega ohms
10 mega ohms
100 mega ohms
1 mega ohms
500 mega ohms
10 mega ohms
100 mega ohms
1 mega ohms
Answer
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Distance relays are generally
impedance relays
split-phase relays
reactance relays
none of these
impedance relays
split-phase relays
reactance relays
none of these
Answer
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If the fault occurs near the impedance relay, the V/ I ratio will be
higher than that of if fault occurs away from the relay
Lower than that of if fault occurs away from the relay
None of these
constant for all distances
higher than that of if fault occurs away from the relay
Lower than that of if fault occurs away from the relay
None of these
constant for all distances
Answer
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Which of the following is used in liquid fuses ?
sulphur hexafluoride
carbon tetrachloride
transformer oil
distilled water
sulphur hexafluoride
carbon tetrachloride
transformer oil
distilled water
Answer
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An isolator is designed to open a circuit under
None of these
normal conditions
full load
no load
None of these
normal conditions
full load
no load
Answer
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