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Answer :

The arc voltage produced in A.C. circuit breaker is always in phase with the arc current.

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Description : The arc voltage in a circuit breaker is :

Answer : The arc voltage in a circuit breaker is : in phase with the arc current

Description : The arc temperature in Oil Circuit Breaker may reach up to_______.  (A) 5,000° K (B) 8,000° K (C) 10,000° K (D) None of the above

Answer : The arc temperature in Oil Circuit Breaker may reach up to 5,000° K 

Answer : Arc in a circuit breaker is interrupted at zero current.

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Answer : Which of the following is used in a circuit breaker as the medium in which the arc forms? A) Insulating gas B) Insulating oil C) Vacuum D) All the above

Answer : The voltage appearing across the contacts after opening of the circuit breaker is called recovery voltage.