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The fuse wire, in D.C. circuits, is inserted in
none of the listed here
positive circuit only
Both of the listed here
negative circuit only
none of the listed here
positive circuit only
Both of the listed here
negative circuit only
Answer
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The transient voltage that appears across the contacts at the instant of arc extinction is called
peak voltage
restriking voltage
supply voltage
recovery voltage
peak voltage
restriking voltage
supply voltage
recovery voltage
Answer
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Which of the following circuit breakers is prefered for EHT applications ?
low oil circuit breaker
bulk oil circuit breaker
Sf6 CB
air break circuit breaker
low oil circuit breaker
bulk oil circuit breaker
Sf6 CB
air break circuit breaker
Answer
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If the length of the arc in a circuit breaker increases, its resistance
remains same
decreases
None of these
increases
remains same
decreases
None of these
increases
Answer
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Directional relay are based on flow of
voltage wave
power
current
All of these
voltage wave
power
current
All of these
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SF6 gas
is lighter than air
is yellow in colour
is nontoxic
None of these
has pungent small
is lighter than air
is yellow in colour
is nontoxic
None of these
has pungent small
Answer
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