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The power loss is an important factor for the design of

feeder
transmission line
generator
motor

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The rating of a circuit breaker is generally determined on the basis of

line to line fault current
double line to ground fault current
symmetrical fault current
single line to ground fault current

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Overheating of relay contacts or contact born out is due to

too low contact pressure
slow making and breaking of load circuit contacts
foreign matter on the contact surface
all of these

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To limit short-circuit current in a power system are used

H.R. fuses
reactors
isolators
earth wires

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A fuse should have

All of these
high conductivity
low melting point
low cost

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If the fault occurs near the impedance relay, the V/ I ratio will be

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

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