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The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be
200 A
100 A
300 A
more than 1000 A
200 A
100 A
300 A
more than 1000 A
Answer
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Air blast circuit breakers for 400 kV power system are designed to operate in
0.1 sec
50 milli-second
0.5 sec
100 micro-second
0.1 sec
50 milli-second
0.5 sec
100 micro-second
Answer
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For the protection of power station buildings against direct strokes the requirements are
interception and conduction
interception
interception, conduction, dissipation and reflection
None of these
interception, conduction and dissipation
interception and conduction
interception
interception, conduction, dissipation and reflection
None of these
interception, conduction and dissipation
Answer
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Insulation resistance of high voltage circuit breakers is more than
1 mega ohms
500 mega ohms
100 mega ohms
10 mega ohms
1 mega ohms
500 mega ohms
100 mega ohms
10 mega ohms
Answer
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The time of closing the cycle, in modern circuit breakers is
0.003 sec
0.10 sec
0.01 sec
0.001 sec
0.003 sec
0.10 sec
0.01 sec
0.001 sec
Answer
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HRC fuses provide best protection against
overload
short circuits
reverse current
open circuits
overload
short circuits
reverse current
open circuits
Answer
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