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The time-current graph of a fuse
has inverse characteristic
has a linear characteristic
is a circle
None of these
has inverse characteristic
has a linear characteristic
is a circle
None of these
Answer
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Related Question
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Which of the following circuit breakers is prefered for EHT applications ?
bulk oil circuit breaker
Sf6 CB
air break circuit breaker
low oil circuit breaker
bulk oil circuit breaker
Sf6 CB
air break circuit breaker
low oil circuit breaker
Answer
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Insulation resistance of high voltage circuit breakers is more than
100 mega ohms
500 mega ohms
10 mega ohms
1 mega ohms
100 mega ohms
500 mega ohms
10 mega ohms
1 mega ohms
Answer
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The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to
insulate the contacts from switch body
lubricate the contacts
All of these
extinguish the arc
None of these
insulate the contacts from switch body
lubricate the contacts
All of these
extinguish the arc
None of these
Answer
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Back up protection is generally used for protection against
None of these
short-circuit faults only
both open and short-circuit faults
open-circuit faults only
None of these
short-circuit faults only
both open and short-circuit faults
open-circuit faults only
Answer
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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/√3 A
None of these
750 A
1500 A
1500/√3 A
None of these
750 A
1500 A
Answer
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