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


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B. Symmetrical fault current

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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


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D. All of the above

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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


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A. Automatically

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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


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D. A resistance decreasing with voltage rise across the arc

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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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