Circuit Breakers – Exercise – 1

Circuit Breakers » Exercise – 1

1. A circuit breaker is :

(a) power factor correcting device
(b) a device to neutralize the effect of transients
(c) a waveform correcting device
(d) a current interrupting device

2. The fault clearing time of a circuit breaker is usually :

(a) few minutes
(b) few seconds
(c) one second
(d) few cycles of supply voltage

3. The medium employed for extinction of arc in air circuit breaker is :

(a) SF₆
(b) Oil
(c) Air
(d) Water

4. Which of the following circuit breakers is preferred for EHT application :

(a) Air blast circuit breakers
(b) Minimum oil circuit breakers
(c) Bulk oil circuit breakers
(d) SF₆ oil circuit breakers

5. For high voltage, ac circuit breakers, the rated short circuit current is passed for :

(a) 0.01 sec
(b) 0.1 sec
(c) 3 seconds
(d) 30 seconds

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