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The rating of a circuit breaker is generally determined on the basis of
symmetrical fault current
single line to ground fault current
double line to ground fault current
line to line fault current
symmetrical fault current
single line to ground fault current
double line to ground fault current
line to line fault current
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The main function of a fuse is to
protect the appliance
prevent excessive currents
protect the line
None of these
open the circuit
protect the appliance
prevent excessive currents
protect the line
None of these
open the circuit
Answer
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With which of the following, a circuit breaker must be equipped for remote operation ?
None of these
inverse time trip
time-delay trip
shunt trip
None of these
inverse time trip
time-delay trip
shunt trip
Answer
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Arc in a circuit breaker is interrupted at
maximum voltage
maximum current
minimum voltage
zero current
maximum voltage
maximum current
minimum voltage
zero current
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A circuit breaker is rated as 1500 A, 1000 MVA, 33 kv, 3-second , 3- phase oil circuit breaker. The rated normal current is
1500 A
None of these
1500/√3 A
750 A
1500 A
None of these
1500/√3 A
750 A
Answer
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Which of the following is used in liquid fuses ?
sulphur hexafluoride
transformer oil
carbon tetrachloride
distilled water
sulphur hexafluoride
transformer oil
carbon tetrachloride
distilled water
Answer
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