Electrical Engineering MCQs

Page No. 154

By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?


aRadiation

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bConvection

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cConduction

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dAll of the above

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View Answer Conduction

A balanced 3-phase system consists of_______________?


azero sequence currents only

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bpositive sequence currents only

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cnegative and zero sequence currents

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dzero, negative and positive sequence currents

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A short-circuit is identified by_____________?


ano current flow

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bheavy current flow

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cvoltage drop

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dvoltage rise

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View Answer heavy current flow

To limit short-circuit current in a power system are used______________?


aearth wires

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bisolators

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cH.R.C. fuses

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dreactors

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View Answer reactors

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


afault occurs on the bus itself

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bfault occurs on neutral line

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c two or more faults occur simultaneously

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dfault occurs with respect to earthing

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Overfluxing protection is recommended for_____________?


adistribution transformer

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bgenerator transformer of the power plant

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cauto-transformer of the power plant

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dstation transformer of the power plant

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If the fault occurs near the impedance relay, the VII ratio will be____________?


aconstant for all distances

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blower than that of if fault occurs away from the relay

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chigher than that of if fault occurs away from the relay

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d none of the above

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The inductive interference between power and communication line can be minimized by__________?


atransposition of the power line

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btransposition of the communication line

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cboth (A) and (B)

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dincreasing the distance between the conductors

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View Answer both (A) and (B)

transmission line has reflection coefficient as one?


aOpen circuit

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bShort-circuit

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c Long

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dNone of the above

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View Answer Open circuit

The relay with inverse time characteristic will operate within____________?


a1.5 sec

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b 5 to 10 sec

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c5 to 20 sec

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d20 to 30 sec

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View Answer 5 to 10 sec

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