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Air blast circuit breaker is used for
over currents
short duty
repeated duty
intermittent duty
over currents
short duty
repeated duty
intermittent duty
Answer
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Related Question
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Which of the following is the least expensive protection for over current is low voltage system ?
air break circuit breaker
isolator
oil circuit breaker
rewireable fuse
air break circuit breaker
isolator
oil circuit breaker
rewireable fuse
Answer
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Interruption of large currents by relay requires
all of these
arc suppressing blow out coils
wide separation of the opened contacts
high speed opening of contacts
all of these
arc suppressing blow out coils
wide separation of the opened contacts
high speed opening of contacts
Answer
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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is
35 kA
20 kA
80 kA
60 kA
35 kA
20 kA
80 kA
60 kA
Answer
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Insulation resistance of high voltage circuit breakers is more than
100 mega ohms
10 mega ohms
500 mega ohms
1 mega ohms
100 mega ohms
10 mega ohms
500 mega ohms
1 mega ohms
Answer
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Breaking capacity of a circuit breaker is usually expressed in terms of
amperes
MVA
volts
Mw
amperes
MVA
volts
Mw
Answer
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