The current zero interruption, in oil and air blast circuit breakers, is achieved by____________?
Correct answer: C. both (A) and (B)
- A. lengthening of the gap
- B. cooling and blast effect
- C. both (A) and (B)
- D. deionizing the oil with forced air
- E. none of the above
Explanation
After the arc current reaches its natural zero, circuit breakers prevent restriking by increasing the gap and removing heat and ionization through cooling or blast action. Both listed mechanisms assist arc extinction.
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