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Air blast circuit breaker is used for

over currents
repeated duty
short duty
intermittent duty

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The time of closing the cycle, in modern circuit breakers is

0.01 sec
0.10 sec
0.003 sec
0.001 sec

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Minimum arcing voltage will be least in case of

carbon
graphite
silver
tungsten

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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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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is

35 kA
20 kA
60 kA
80 kA

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The advantage of HRC fuse is that it

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

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