Circuit Breaker Objective Type Questions and answers

11.  Arc in a circuit breaker is interrupted at

   A. Zero current

   B. Maximum current

   C. Minimum voltage

   D. Maximum voltage

12.  The information to the circuit breaker under fault conditions is provided by

   A. Relay

   B. Rewirable fuse

   C. H.R.C. only

   D. All of the above

13.  In a circuit breaker the time duration from the instant of the fault to extinction of arc is known as

   A. Clearing time

   B. Operation time

   C. Lag time

   D. Lead time

14.  Breaking capacity of a circuit breaker is usually expressed in terms of

   A. Volts

   B. Amperes

   C. MVA

   D. MW

15.  Which of the following is not a part of the circuit breaker

   A. Operating mechanism

   B. Conservator

   C. Explosion pot

   D. Fixed and moving contacts

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