Electrical Engineering MCQs

Page No. 319

A circuit is disconnected by isolators when____________?


aline is energized

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b there is no current in the line

✓


cline is on full load

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dcircuit breaker is not open

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


a Current only

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bCurrent and voltage

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cCurrent, voltage and frequency

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d Current, voltage, frequency and short time current

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In aluminium conductors, steel core is provided to____________?


acompensate for skin effect

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bneutralise proximity effect

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creduce line inductance

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d increase the tensile strength

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


aUsing a guard ring

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bGrading the insulator

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cUsing long cross arm

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dAny of the above

✓


View Answer Any of the above

Owing to skin effect:


acurrent flows through the half cross-section of the conductor

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

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

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dany of the above

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


aRing bus-bar scheme

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bSingle bus-bar scheme

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cBreaker and a half scheme

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dMain and transfer scheme

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View Answer Single bus-bar scheme

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


a insulin

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bbitumen

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cvarnish

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dno insulation is required

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


asemi-circle

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btriangle

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cellipse

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dcatenary

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View Answer catenary

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


a20—25 km

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b40—50 km

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c60—70 km

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d80—100 km

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View Answer 20—25 km

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


aLow cost

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bHigh mechanical strength

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cLonger life

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dAll of the above

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View Answer All of the above

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