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Arc in a circuit breaker behaves as
a resistance decreasing with voltage rise across the arc
a resistance increasing with voltage rise across the arc
a capacitive reactance
an inductive reactance
a resistance decreasing with voltage rise across the arc
a resistance increasing with voltage rise across the arc
a capacitive reactance
an inductive reactance
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
All of these
lubricate the contacts
None of these
extinguish the arc
insulate the contacts from switch body
All of these
lubricate the contacts
None of these
extinguish the arc
Answer
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The relay operating speed depends upon
the spring tension
the rate of flux built up
armature core air gap
All of these
the spring tension
the rate of flux built up
armature core air gap
All of these
Answer
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Which of the following circuit breakers is prefered for EHT applications ?
bulk oil circuit breaker
low oil circuit breaker
Sf6 CB
air break circuit breaker
bulk oil circuit breaker
low oil circuit breaker
Sf6 CB
air break circuit breaker
Answer
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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is
20 kA
80 kA
35 kA
60 kA
20 kA
80 kA
35 kA
60 kA
Answer
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Circuit breakers usually operate under
transient state of short circuit current
sub-transient state of short circuit current
steady state of short circuit current
after dc component has ceased
transient state of short circuit current
sub-transient state of short circuit current
steady state of short circuit current
after dc component has ceased
Answer
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