Circuit Breaker Objective Type Questions and answers

16.  The rating of a circuit breaker is generally determined on the basis of

   A. Line-to-line fault current

   B. Symmetrical fault current

   C. Single line to ground fault current

   D. Double line to ground fault current

17.  In circuit breakers, the advantages of using oil as quenching medium is

   A. Oil act as insulator

   B. Oil has high dielectric strength

   C. Absorption of arc energy

   D. All of the above

18.  In the event of a fault on connected circuit a circuit breaker will operate

   A. Automatically

   B. Manually

   C. Manually through control switch

   D. Depends on the design

19.  An arc in a circuit behaves like

   A. An inductive reactance

   B. A capacitive reactance

   C. Infinite resistance

   D. A resistance decreasing with voltage rise across the arc

20.  A circuit breaker under normal conditions should be inspected

   A. Every day

   B. Every week

   C. Every month

   D. Once in 6 months or 12 months

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