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Breaking capacity of a circuit breaker is usually expressed in terms of
MVA
amperes
volts
Mw
MVA
amperes
volts
Mw
Answer
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Circuit breakers usually operate under
steady state of short circuit current
sub-transient state of short circuit current
transient state of short circuit current
after dc component has ceased
steady state of short circuit current
sub-transient state of short circuit current
transient state of short circuit current
after dc component has ceased
Answer
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The fuse wire, in DC circuit, is inserted in
Both positive and negative circuit
negative circuit only
None of these
positive circuit only
Both positive and negative circuit
negative circuit only
None of these
positive circuit only
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For the same power, the least size is of
oil circuit breaker
vaccum circuit breaker
air-blast circuit breaker
sf6 circuit breaker
oil circuit breaker
vaccum circuit breaker
air-blast circuit breaker
sf6 circuit breaker
Answer
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Resistance grounding is used for voltage between
None of these
11 kv to 33 kv
3.3 kV to 11 kv
33 kV to 66 kV
None of these
11 kv to 33 kv
3.3 kV to 11 kv
33 kV to 66 kV
Answer
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The relay operating speed depends upon
the rate of flux built up
the spring tension
armature core air gap
All of these
the rate of flux built up
the spring tension
armature core air gap
All of these
Answer
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