Electrical Engineering MCQs

Page No. 319

A circuit is disconnected by isolators when____________?


aline is energized


b there is no current in the line


cline is on full load


dcircuit breaker is not open



By which of the following a bus-bar is rated?


a Current only


bCurrent and voltage


cCurrent, voltage and frequency


d Current, voltage, frequency and short time current



In aluminium conductors, steel core is provided to____________?


acompensate for skin effect


bneutralise proximity effect


creduce line inductance


d increase the tensile strength



By which of the following methods string efficiency can be improved?


aUsing a guard ring


bGrading the insulator


cUsing long cross arm


dAny of the above


View Answer Any of the above

Owing to skin effect:


acurrent flows through the half cross-section of the conductor


bportion of the conductor near the surface carries more current and core of the conductor carries less current


cportion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent


dany of the above



Which of the following bus-bar schemes has the lowest cost?


aRing bus-bar scheme


bSingle bus-bar scheme


cBreaker and a half scheme


dMain and transfer scheme


View Answer Single bus-bar scheme

In AC.S.R. conductors, the insulation between aluminium and steel conductors is_________?


a insulin


bbitumen


cvarnish


dno insulation is required



A conductor, due to sag between two supports, takes the form of____________?


asemi-circle


btriangle


cellipse


dcatenary


View Answer catenary

Transmission voltage of 11 kV is normally used for distances up to_____km?


a20—25 km


b40—50 km


c60—70 km


d80—100 km


View Answer 20—25 km

Which of the following characteristics should the line supports for transmission lines possess?


aLow cost


bHigh mechanical strength


cLonger life


dAll of the above


View Answer All of the above

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