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The operating time of a circuit breaker is

0.002 sec
0.001 sec
0.2 sec
0.05 sec

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An isolator is designed to open a circuit under

no load
normal conditions
None of these
full load

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The rating of a circuit breaker is generally determined on the basis of

symmetrical fault current
single line to ground fault current
double line to ground fault current
line to line fault current

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Which of the following is the least expensive protection for over current is low voltage system ?

oil circuit breaker
isolator
air break circuit breaker
rewireable fuse

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The advantage of HRC fuse is that it

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

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A circuit breaker is a

current controlling device
circuit interrupting device
None of these
current limiting device

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