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In Railway applications ______ circuit breaker is used.
SFe
minimum oil
bulk oil
air break
SFe
minimum oil
bulk oil
air break
Answer
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The voltage appearing across the contacts after opening of the circuit breaker is called
surge voltage
operating voltage
recovery voltage
arc voltage
surge voltage
operating voltage
recovery voltage
arc voltage
Answer
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If the length of the arc in a circuit breaker increases, its resistance
None of these
remains same
increases
decreases
None of these
remains same
increases
decreases
Answer
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An isolator is designed to open a circuit under
no load
full load
None of these
normal conditions
no load
full load
None of these
normal conditions
Answer
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To reduce short circuit fault currents......... are used.
capacitors
resistors
reactors
None of these
capacitors
resistors
reactors
None of these
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Insulation resistance of high voltage circuit breakers is more than
10 mega ohms
500 mega ohms
100 mega ohms
1 mega ohms
10 mega ohms
500 mega ohms
100 mega ohms
1 mega ohms
Answer
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