Recent questions and answers in Circuit breaker

1 answer 34 views

The interrupting time of a circuit breaker is the period between the instant of  (A) initiation of short circuit and the arc extinction on an opening operation (B) energizing of the trip circuit and the arc extinction on an opening operation (C) initiation of short circuit and the parting of primary arc contacts (D) energizing of the trip circuit and the parting of primary arc contacts

answered May 25, 2018 in Circuit breaker
1 answer 10 views

Making current of a circuit breaker refers to: (1) Steady state rated current (2) Average value of transient short circuit current (3) R.M.S. value of the short circuit current at the the time of major peak (4) Equal to the fault current

answered May 22, 2018 in Circuit breaker
1 answer 17 views

Out of the followings, which one is correct in case of a circuit breaker? (1) Making capacity = 2.55 X braking capacity (2) Braking capacity = 2.55 X making capacity (3) Making capacity = 1.8 X braking capacity (4) Braking capacity = 1.8 X making capacity

answered May 22, 2018 in Circuit breaker
1 answer 16 views

The Use of high speed circuit breakers  A) Reduces the short circuit current B) Improves system stability C) Decreases system stability D) Increases the short circuit current

answered May 20, 2018 in Circuit breaker
1 answer 28 views

Resistance switching is employed in  A) All breakers B)Bulk oil breakers C) Minimum oil breakers D) Air blast circuit breakers

answered May 20, 2018 in Circuit breaker
1 answer 22 views

Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching.  A) Vacuum B) Air blast C) SF6 D) Oil

answered May 20, 2018 in Circuit breaker
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