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The power loss is an important factor for the design of

feeder
generator
transmission line
motor

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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

All of these
extinguish the arc
None of these
lubricate the contacts
insulate the contacts from switch body

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

isolators
H.R. fuses
earth wires
reactors

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In a single bus-bar system there will be complete shut down when

fault occurs on neutral line
fault occurs with respect to earthing
fault occurs on the bus itself
two or more faults occur simultaneously

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A differential relay measures the vector difference between

two voltages
None of these
two or more similar electrical quantities
two currents

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