Electrical Engineering MCQs

Page No. 210

Underground cables are laid at sufficient depth___________?


ato minimise temperature stresses

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bto avoid being unearthed easily due to removal of soil

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

✓


dfor all of the above reasons

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The thickness of metallic shielding on cables is usually_______________?


a 0.04 mm

✓


b0.2 to 0.4 mm

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c3 to 5 mm

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d40 to 60 mm

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View Answer 0.04 mm

The breakdown voltage of a cable depends on_____________?


apresence of moisture

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bworking temperature

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c time of application of the voltage

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dall of the above

✓


View Answer all of the above

The advantage of oil filled cables is_________?


amore perfect impregnation

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bsmaller overall size

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cno ionisation, oxidation and formation of voids

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dall of the above

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View Answer all of the above

Copper as conductor for cables is used as________?


a annealed

✓


b hardened and tempered

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chard drawn

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dalloy with chromium

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View Answer annealed

Cables for 220 kV lines are invariably____________?


amica insulated

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bpaper insulated

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ccompressed oil or compressed gas insulated

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d rubber insulated

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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

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b10 cm

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c50 cm

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d 400 cm

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View Answer 50 cm

The insulating material should have____________?


a low permittivity

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bhigh resistivity

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chigh dielectric strength

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dall of the above

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View Answer all of the above

The disadvantage with paper as insulating material is____________?


ait is hygroscopic

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b it has high capacitance

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c it is an organic material

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dnone of the above

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View Answer it is hygroscopic

Rubber is most commonly used insulation in cables


aYes

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bNo

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cNone of these

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dnone of the above

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View Answer Yes

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