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SF6 gas
None of these
is yellow in colour
is nontoxic
is lighter than air
has pungent small
None of these
is yellow in colour
is nontoxic
is lighter than air
has pungent small
Answer
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Related Question
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With which of the following, a circuit breaker must be equipped for remote operation ?
shunt trip
time-delay trip
inverse time trip
None of these
shunt trip
time-delay trip
inverse time trip
None of these
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
None of these
extinguish the arc
lubricate the contacts
insulate the contacts from switch body
All of these
None of these
extinguish the arc
lubricate the contacts
insulate the contacts from switch body
All of these
Answer
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The fault that imposes severest duty on the circuit breaker is
line to ground fault
two lines to ground fault
all three lines short-circuited
line to line fault
line to ground fault
two lines to ground fault
all three lines short-circuited
line to line fault
Answer
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The material used for fuse must have
low melting point and high specific resistance
Low melting point and low specific resistance
low melting point and any specific resistance
high melting point and low specific resistance
low melting point and high specific resistance
Low melting point and low specific resistance
low melting point and any specific resistance
high melting point and low specific resistance
Answer
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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is
20 kA
35 kA
60 kA
80 kA
20 kA
35 kA
60 kA
80 kA
Answer
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