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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
extinguish the arc
None of these
All of these
lubricate the contacts
insulate the contacts from switch body
extinguish the arc
None of these
All of these
lubricate the contacts
Answer
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Related Question
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The making capacity of a circuit breaker is equal to
√2 × symmetrical breaking capacity
None of these
√3 × symmetrical breaking capacity
2.55 × symmetrical breaking capacity
√2 × symmetrical breaking capacity
None of these
√3 × symmetrical breaking capacity
2.55 × symmetrical breaking capacity
Answer
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Circuit breakers usually operate under
after dc component has ceased
steady state of short circuit current
sub-transient state of short circuit current
transient state of short circuit current
after dc component has ceased
steady state of short circuit current
sub-transient state of short circuit current
transient state of short circuit current
Answer
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The rate of rise of restriking voltage depends on
the inductance of the system only
the type of circuit breaker
both inductance and capacitance of the system
the capacitance of the system only
the inductance of the system only
the type of circuit breaker
both inductance and capacitance of the system
the capacitance of the system only
Answer
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Series capacitors are used to
improve line voltage
None of these
compensate for line capacitive reactance
compensate for line inductive reactance
improve line voltage
None of these
compensate for line capacitive reactance
compensate for line inductive reactance
Answer
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The advantage of HRC fuse is that it
is quite cheap
All of these
has high speed of operation
does not deteriorate with age
is quite cheap
All of these
has high speed of operation
does not deteriorate with age
Answer
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