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Which of the following circuit breakers is prefered for EHT applications ?

air break circuit breaker
Sf6 CB
low oil circuit breaker
bulk oil circuit breaker

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The fault that imposes severest duty on the circuit breaker is

line to ground fault
all three lines short-circuited
line to line fault
two lines to ground fault

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The making capacity of a circuit breaker is equal to

2.55 × symmetrical breaking capacity
√2 × symmetrical breaking capacity
√3 × symmetrical breaking capacity
None of these

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Which of the following CB's is generally used in railways applications ?

low oil circuit breaker
sf 6 circuit breaker
bulk oil circuit breaker
air break circuit breaker

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The advantage of HRC fuse is that it

has high speed of operation
does not deteriorate with age
is quite cheap
All of these

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