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


bConvection


cConduction


dAll of the above


View Answer Conduction

A balanced 3-phase system consists of_______________?


azero sequence currents only


bpositive sequence currents only


cnegative and zero sequence currents


dzero, negative and positive sequence currents



A short-circuit is identified by_____________?


ano current flow


bheavy current flow


cvoltage drop


dvoltage rise


View Answer heavy current flow

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


aearth wires


bisolators


cH.R.C. fuses


dreactors


View Answer reactors

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


afault occurs on the bus itself


bfault occurs on neutral line


c two or more faults occur simultaneously


dfault occurs with respect to earthing



Overfluxing protection is recommended for_____________?


adistribution transformer


bgenerator transformer of the power plant


cauto-transformer of the power plant


dstation transformer of the power plant



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


aconstant for all distances


blower than that of if fault occurs away from the relay


chigher than that of if fault occurs away from the relay


d none of the above



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


atransposition of the power line


btransposition of the communication line


cboth (A) and (B)


dincreasing the distance between the conductors


View Answer both (A) and (B)

transmission line has reflection coefficient as one?


aOpen circuit


bShort-circuit


c Long


dNone of the above


View Answer Open circuit

The relay with inverse time characteristic will operate within____________?


a1.5 sec


b 5 to 10 sec


c5 to 20 sec


d20 to 30 sec


View Answer 5 to 10 sec

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