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cables MCQs

Practise focused cables questions with marked answers for exam preparation and subject revision.

cables Mcqs
1. In case of three core flexible cable the colour of the neutral is_________?
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A. none of the above

B. brown

C. black

D. blue
2. In single core cables armouring is not done to________?
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A. either of the above

B. avoid excessive sheath losses

C. none of the above

D. make it flexible

3. Polyethylene has very poor dielectric and ageing properties
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A. Yes

B. No
4. The insulating material should have____________?
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A. low permittivity

B. all of the above

C. high resistivity

D. high dielectric strength

5. If the length of a cable is doubled, its capacitance____________?
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A. becomes one-half

B. becomes one-fourth

C. becomes double

D. remains unchanged

6. It is difficult to maintain oil filled cables____________?
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A. No

B. Yes
7. In cables the charging current__________?
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A. leads the voltage by 90

B. leads the voltage by 180

C. lags the voltage by 180

D. lags the voltage by 90

8. The disadvantage with paper as insulating material is____________?
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A. it has high capacitance

B. it is an organic material

C. it is hygroscopic

D. none of the above

9. The relative permittivity of rubber is____________?
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A. between 5 and 6

B. between 12 and 14

C. between 8 and 10

D. between 2 and 3
10. Rubber is most commonly used insulation in cables
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A. Yes

B. No

11. The breakdown voltage of a cable depends on_____________?
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A. working temperature

B. all of the above

C. presence of moisture

D. time of application of the voltage

12. Cables, generally used beyond 66 kV are___________?
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A. oil filled

B. belted

C. armoured

D. S.L. type

13. The insulating material for cables should____________?
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A. have all above properties

B. be non-inflammable

C. be acid proof

D. be non-hygroscopic

14. Empire tape is__________?
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A. impregnated paper

B. vulcanised rubber

C. none of the above

D. varnished cambric
15. Which of the following insulation is used in cables ?
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A. Rubber

B. Any of the above

C. Paper

D. Varnished cambric

16. cables are used for 132 kV lines____________?
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A. Super tension

B. High tension

C. Extra super voltage

D. Extra high tension

17. Underground cables are laid at sufficient depth___________?
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A. for all of the above reasons

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

C. to minimise temperature stresses

D. to avoid being unearthed easily due to removal of soil

18. If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?
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A. 15 kV/mm

B. 30 kV/mm

C. 10 kV/mm

D. 5 kV/mm

19. Copper as conductor for cables is used as________?
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A. hard drawn

B. hardened and tempered

C. alloy with chromium

D. annealed
20. The electrostatic stress in underground cables is_________?
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A. none of the above

B. same at the conductor and the sheath

C. maximum at the conductor and minimum at the sheath

D. zero at the conductor as well as on the sheath

E. minimum at the conductor and maximum at the sheath