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The rate of rise of restriking voltage depends on
both inductance and capacitance of the system
the type of circuit breaker
the capacitance of the system only
the inductance of the system only
both inductance and capacitance of the system
the type of circuit breaker
the capacitance of the system only
the inductance of the system only
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The rated secondary current of current transformer for relays is generally
5 A
10 A
30 A
20 A
5 A
10 A
30 A
20 A
Answer
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The fuse wire, in DC circuit, is inserted in
negative circuit only
positive circuit only
Both positive and negative circuit
None of these
negative circuit only
positive circuit only
Both positive and negative circuit
None of these
Answer
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protection of fuses is generally not used beyond
50 A
20 A
200 A
100 A
50 A
20 A
200 A
100 A
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Which of the following circuit breakers is prefered for EHT applications ?
bulk oil circuit breaker
Sf6 CB
air break circuit breaker
low oil circuit breaker
bulk oil circuit breaker
Sf6 CB
air break circuit breaker
low oil circuit breaker
Answer
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If the fault occurs near the impedance relay, the V/ I ratio will be
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
constant for all distances
Answer
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