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The power loss is an important factor for the design of

generator
motor
transmission line
feeder

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The relay operating speed depends upon

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

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The advantage of HRC fuse is that it

does not deteriorate with age
All of these
has high speed of operation
is quite cheap

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Minimum arcing voltage will be least in case of

carbon
graphite
silver
tungsten

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The time-current graph of a fuse

has inverse characteristic
is a circle
None of these
has a linear characteristic

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Back up protection is generally used for protection against

open-circuit faults only
short-circuit faults only
None of these
both open and short-circuit faults

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