Oil Circuit Breaker Objective Type Questions and answers


31.  Main purpose of oil in oil circuit breaker is to


   A. Provide insulation

   B. Provide cooling of contacts

   C. Quenching arc

   D. All of the above


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C. Quenching arc

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32.  In a minimum oil circuit breaker the oil use used


   A. To act as a circuit breaking medium only

   B. For circuit breaking and providing insulation

   C. For providing insulation only

   D. For none of the above purposes


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A. To act as a circuit breaking medium only

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33.  Arc interruption in an oil circuit breaker takes place when


   A. Contacts apart

   B. Voltage goes through zero

   C. Current goes through zero

   D. None of the above


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C. Current goes through zero

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34.  The minimum oil circuit breaker has less volume of oil because


   A. The oil between the breaker contacts has greater strength

   B. There is insulation between the breaker contacts

   C. Solid insulation is provided for insulating the contacts from the earth

   D. Any of the above


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C. Solid insulation is provided for insulating the contacts from the earth

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35.  To limit current shopping in vacuum circuit breaker is the contact material employed should have the properties of


   A. Low conductivity and high vapour pressure

   B. Low conductivity and low vapour pressure

   C. High conductivity and high vapour pressure

   D. High conductivity and low vapour pressure


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A. Low conductivity and high vapour pressure

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