Circuit Breakers MCQ

  1. Which one of the following statements is NOT true for small oil volume circuit breaker? 

(A) It requires less quantity of oil 

(C) Duration of arc is 1 to 2 cycles. 

(B) It occupies less space 

(D) Its maintenance is more 


  1. Which one of the following statements is NOT true for air blast circuit breaker? 

(A) The size of arc chamber is big 

(B) Its arcing time less

(C) Possibility of fire is less 

(D) It needs air compressor plant 


  1. Which one of the following is NOT true for axial air blast circuit breaker? 

(A) It needs air compressor plant 

(B) An isolator is used in series with the contacts 

(C) It is used above 110 kV 

(D) Its capability to extinguish arc is relatively more than that of oil 


14.Which one of the following is NOT true for SF circuit breaker ? 

(A) Its arcing time is less 

(B) Dielectric strength of SF gas is 2 to 3 times than that of air 

(C) Its maintenance is less 

(D) It produces explosive gases 


15.Which one of the following statements is true for SF circuit breaker? 

(A) Its arcing time is more compared to air. 

(B) Dielectric strength of SF is 5 to 6 times than that of air 

(C) Its maintenance is more 

(D) These can be used in coal mines.

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