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Which of the following CB's is generally used in railways applications ?
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
air break circuit breaker
Answer
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Related Question
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The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is
4
2
6
8
4
2
6
8
Answer
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The reflection co-efficient at the open circuited end of a transmission line
unity
infinity
zero
None of these
unity
infinity
zero
None of these
Answer
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Interruption of large currents by relay requires
high speed opening of contacts
wide separation of the opened contacts
all of these
arc suppressing blow out coils
high speed opening of contacts
wide separation of the opened contacts
all of these
arc suppressing blow out coils
Answer
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The operating time of a fuse is about
0.002 sec
1.5 sec
1 sec
0.8 sec
0.002 sec
1.5 sec
1 sec
0.8 sec
Answer
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A _______ is used to measure the stator % winding temperature of the generator.
resistance thermometer
thermocouple
pyrometer
thermometer
resistance thermometer
thermocouple
pyrometer
thermometer
Answer
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