Circuit Breaker Objective Type Questions and answers


6.  Circuit breakers usually operates under


   A. Transient state of short circuit current

   B. Sub transient state of short circuit current

   C. Steady state of short circuit current

   D. After DC component has ceased


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A. Transient state of short circuit current

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7.  The voltage appearing across the contacts after opening of the circuit breaker is called..............voltage


   A. Recovery

   B. Surge

   C. Operating

   D. Arc


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A. Recovery

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8.  In a circuit breaker the basic problem is to


   A. Maintain the arc

   B. Extinguish the arc

   C. Transmit large power

   D. Emit the ionizing electrons


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B. Extinguish the arc

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9.  The arc voltage produced in ac circuit breaker is always


   A. In phase with arc current

   B. Legging the arc current by 90o

   C. Leading the arc current by 90o

   D. None of the above


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A. In phase with arc current

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10.  In railway applications............circuit breaker is used


   A. Sf6

   B. Bulk oil

   C. Minimum oil

   D. Air brake


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D. Air brake

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