Electrical Engineering MCQs

Page No. 210

Underground cables are laid at sufficient depth___________?


ato minimise temperature stresses


bto avoid being unearthed easily due to removal of soil


cto minimize the effect of shocks and vibrations due to gassing vehicles, etc


dfor all of the above reasons



The thickness of metallic shielding on cables is usually_______________?


a 0.04 mm


b0.2 to 0.4 mm


c3 to 5 mm


d40 to 60 mm


View Answer 0.04 mm

The breakdown voltage of a cable depends on_____________?


apresence of moisture


bworking temperature


c time of application of the voltage


dall of the above


View Answer all of the above

The advantage of oil filled cables is_________?


amore perfect impregnation


bsmaller overall size


cno ionisation, oxidation and formation of voids


dall of the above


View Answer all of the above

Copper as conductor for cables is used as________?


a annealed


b hardened and tempered


chard drawn


dalloy with chromium


View Answer annealed

Cables for 220 kV lines are invariably____________?


amica insulated


bpaper insulated


ccompressed oil or compressed gas insulated


d rubber insulated



If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be______________?


a2 cm


b10 cm


c50 cm


d 400 cm


View Answer 50 cm

The insulating material should have____________?


a low permittivity


bhigh resistivity


chigh dielectric strength


dall of the above


View Answer all of the above

The disadvantage with paper as insulating material is____________?


ait is hygroscopic


b it has high capacitance


c it is an organic material


dnone of the above


View Answer it is hygroscopic

Rubber is most commonly used insulation in cables


aYes


bNo


cNone of these


dnone of the above


View Answer Yes

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