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If the fault occurs near the impedance relay, the V/ I ratio will be
constant for all distances
None of these
higher than that of if fault occurs away from the relay
Lower than that of if fault occurs away from the relay
constant for all distances
None of these
higher than that of if fault occurs away from the relay
Lower than that of if fault occurs away from the relay
Answer
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Resistance grounding is used for voltage between
None of these
3.3 kV to 11 kv
33 kV to 66 kV
11 kv to 33 kv
None of these
3.3 kV to 11 kv
33 kV to 66 kV
11 kv to 33 kv
Answer
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To limit short-circuit current in a power system are used
isolators
reactors
H.R. fuses
earth wires
isolators
reactors
H.R. fuses
earth wires
Answer
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An isolator is designed to open a circuit under
no load
normal conditions
None of these
full load
no load
normal conditions
None of these
full load
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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Most of the relays on service on electric power system are
electro-mechanical relays
None of these
thermal relays
electronic relays
electro-mechanical relays
None of these
thermal relays
electronic relays
Answer
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