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MCQs 1: Rubber is most commonly used insulation in cables

Yes No
Answer Explanation

MCQs 2: The disadvantage with paper as insulating material is____________?

it is hygroscopic it has high capacitance it is an organic material none of the above
Answer Explanation

MCQs 3: The insulating material should have____________?

low permittivity high resistivity high dielectric strength all of the above
Answer Explanation

MCQs 4: If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be______________?

2 cm 10 cm 50 cm 400 cm
Answer Explanation

MCQs 5: Cables for 220 kV lines are invariably____________?

mica insulated paper insulated compressed oil or compressed gas insulated rubber insulated none of the above
Answer Explanation

MCQs 6: Copper as conductor for cables is used as________?

annealed hardened and tempered hard drawn alloy with chromium
Answer Explanation

MCQs 7: The advantage of oil filled cables is_________?

more perfect impregnation smaller overall size no ionisation, oxidation and formation of voids all of the above
Answer Explanation

MCQs 8: The breakdown voltage of a cable depends on_____________?

presence of moisture working temperature time of application of the voltage all of the above
Answer Explanation

MCQs 9: The thickness of metallic shielding on cables is usually_______________?

0.04 mm 0.2 to 0.4 mm 3 to 5 mm 40 to 60 mm
Answer Explanation

MCQs 10: Underground cables are laid at sufficient depth___________?

to minimise temperature stresses to avoid being unearthed easily due to removal of soil to minimize the effect of shocks and vibrations due to gassing vehicles, etc for all of the above reasons
Answer Explanation

MCQs 11: The electrostatic stress in underground cables is_________?

same at the conductor and the sheath minimum at the conductor and maximum at the sheath maximum at the conductor and minimum at the sheath zero at the conductor as well as on the sheath none of the above
Answer Explanation

MCQs 12: A cable carrying alternating current has__________?

hysteresis losses only hysteresis and leakage losses only hysteresis, leakage and copper losses only hysteresis, leakage, copper and friction losses
Answer Explanation

MCQs 13: Capacitance grading of cable implies__________?

use of dielectrics of different permeabilities grading according to capacitance of cables per km length cables using single dielectric in different concentrations capacitance required to be introduced at different lengths to counter the effect of inductance none of the above
Answer Explanation

MCQs 14: The advantage of cables over overhead transmission lines is___________?

easy maintenance low cost can be used in congested areas can be used in high voltage circuits
Answer Explanation

MCQs 15: Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ____________?

Polyvinyle chloride Vulcanised rubber Impregnated paper Compressed SFe gas none of the above
Answer Explanation

MCQs 16: The insulation of the cable decreases with__________?

the increase in length of the insulation the decrease in the length of the insulation either A. or (b) none of the above
Answer Explanation

MCQs 17: In a cable the voltage stress is maximum at____________?

sheath insulator surface of the conductor core of the conductor
Answer Explanation

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