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Circuit Breakers – 1 – 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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

(a) SF6
(b) Oil

(c) Air
(d) Water

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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