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A circuit breaker must perform the duty of
being closed on to a fault
opening the faulty circuit and breaking the fault current
All of these
carrying fault current for a short time
being closed on to a fault
opening the faulty circuit and breaking the fault current
All of these
carrying fault current for a short time
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The information to the circuit breaker under fault conditions is provided by
rewirable fuse
H.R.'only
All of these
relay
rewirable fuse
H.R.'only
All of these
relay
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protection of fuses is generally not used beyond
50 A
100 A
20 A
200 A
50 A
100 A
20 A
200 A
Answer
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When a fault occur in a power system, the circuit breaker
None of these
is opened by remote control
opens automatically
is opened manually
None of these
is opened by remote control
opens automatically
is opened manually
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Breaking capacity of a circuit breaker is usually expressed in terms of
MVA
Mw
volts
amperes
MVA
Mw
volts
amperes
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Arc in a circuit breaker is interrupted at
maximum voltage
minimum voltage
zero current
maximum current
maximum voltage
minimum voltage
zero current
maximum current
Answer
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