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The arcing contacts in a circuit breaker are made of
porcelain
copper tungsten alloy
aluminium alloy
electrolytic copper
porcelain
copper tungsten alloy
aluminium alloy
electrolytic copper
Answer
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When a fault occur in a power system, the circuit breaker
None of these
is opened by remote control
opens automatically
is opened manually
None of these
is opened by remote control
opens automatically
is opened manually
Answer
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The time-current graph of a fuse
has inverse characteristic
None of these
is a circle
has a linear characteristic
has inverse characteristic
None of these
is a circle
has a linear characteristic
Answer
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protection of fuses is generally not used beyond
20 A
200 A
100 A
50 A
20 A
200 A
100 A
50 A
Answer
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The transient voltage that appears across the contacts at the instant of arc extinction is called
supply voltage
peak voltage
restriking voltage
recovery voltage
supply voltage
peak voltage
restriking voltage
recovery voltage
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The relay operating speed depends upon
All of these
the rate of flux built up
the spring tension
armature core air gap
All of these
the rate of flux built up
the spring tension
armature core air gap
Answer
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