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protection of fuses is generally not used beyond

50 A
200 A
20 A
100 A

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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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If the length of the arc in a circuit breaker increases, its resistance

None of these
increases
remains same
decreases

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Interruption of large currents by relay requires

all of these
arc suppressing blow out coils
wide separation of the opened contacts
high speed opening of contacts

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The advantage of HRC fuse is that it

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

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The fuse wire, in D.C. circuits, is inserted in

none of the listed here
negative circuit only
positive circuit only
Both of the listed here

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