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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
extinguish the arc
insulate the contacts from switch body
lubricate the contacts
All of these
None of these
extinguish the arc
insulate the contacts from switch body
lubricate the contacts
All of these
None of these
Answer
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Related Question
Switch Gear
SF 6 gas
Is nontoxic
is yellow in colour
is lighter than air
has pungent small
Is nontoxic
is yellow in colour
is lighter than air
has pungent small
Answer
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Switch Gear
A fuse is never inserted in
neutral wire
phase line
positive of dc circuit
negative of dc circuit
neutral wire
phase line
positive of dc circuit
negative of dc circuit
Answer
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Switch Gear
If the fault occurs near the impedance relay, the V/ I ratio will be
None of these
Lower than that of if fault occurs away from the relay
constant for all distances
higher than that of if fault occurs away from the relay
None of these
Lower than that of if fault occurs away from the relay
constant for all distances
higher than that of if fault occurs away from the relay
Answer
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Switch Gear
A differential relay measures the vector difference between
two or more similar electrical quantities
None of these
two currents
two voltages
two or more similar electrical quantities
None of these
two currents
two voltages
Answer
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Switch Gear
Air blast circuit breakers for 400 kV power system are designed to operate in
50 milli-second
0.1 sec
0.5 sec
100 micro-second
50 milli-second
0.1 sec
0.5 sec
100 micro-second
Answer
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