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The arcing contacts in a circuit breaker are made of
copper tungsten alloy
porcelain
electrolytic copper
aluminium alloy
copper tungsten alloy
porcelain
electrolytic copper
aluminium alloy
Answer
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Which of the following CB's is generally used in railways applications ?
air break circuit breaker
bulk oil circuit breaker
low oil circuit breaker
sf 6 circuit breaker
air break circuit breaker
bulk oil circuit breaker
low oil circuit breaker
sf 6 circuit breaker
Answer
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Circuit breakers usually operate under
steady state of short circuit current
sub-transient state of short circuit current
transient state of short circuit current
after dc component has ceased
steady state of short circuit current
sub-transient state of short circuit current
transient state of short circuit current
after dc component has ceased
Answer
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An isolator is designed to open a circuit under
full load
normal conditions
None of these
no load
full load
normal conditions
None of these
no load
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The material used for fuse must have
low melting point and any specific resistance
low melting point and high specific resistance
Low melting point and low specific resistance
high melting point and low specific resistance
low melting point and any specific resistance
low melting point and high specific resistance
Low melting point and low specific resistance
high melting point and low specific resistance
Answer
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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
100 A
200 A
more than 1000 A
300 A
100 A
200 A
more than 1000 A
300 A
Answer
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