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The power loss is an important factor for the design of

generator
motor
feeder
transmission line

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The fuse wire, in D.C. circuits, is inserted in

positive circuit only
Both of the listed here
none of the listed here
negative circuit only

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The relay operating speed depends upon

armature core air gap
the rate of flux built up
the spring tension
All of these

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The information to the circuit breaker under fault conditions is provided by

All of these
H.R.'only
rewirable fuse
relay

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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
None of these
lubricate the contacts
extinguish the arc
All of these

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A circuit breaker must perform the duty of

carrying fault current for a short time
All of these
being closed on to a fault
opening the faulty circuit and breaking the fault current

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