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Arc extinction in a High Voltage AC Circuit Breaker is achieved by:

AApplying DC reverse voltage
BIncreasing arc resistance to infinity instantly
CIncreasing dielectric strength of the medium between contacts
DShorting the contacts permanently

Explanation

AC arc extinction occurs at current zero crossing by rapidly deionizing the gap to build dielectric strength faster than restriking voltage.

Submitted by: mcqstutor Team More Electrical Engineering MCQs →

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