Cable types - MCQs with Answers

Cable types - MCQs with Answers

Q1. How many cores are used in a cable for the transmission of voltages upto 66 kV?

a. Single core.
b. Two core.
c. Three core.
d. All of the above.

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Q2. Why is the single core cables not provided with armouring?

a. Avoids excessive loss in the armour.
b. Make the cable more flexible.
c. Make the cable non hygroscopic.
d. None of the above.

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Q3. Which among the following cables are generally suited for the voltages upto 11 kV?

a. Belted cables
b. Screened cables
c. Pressure cables
d. None of these.

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Q4. Which material is suitable for the manufacture of armour in a single core cable?

a. Magnetic material.
b. Non magnetic and non conducting material.
c. Non magnetic and conducting material.
d. Magnetic and non conducting material.

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Q5. Why the belted type cable constructions are not suitable for voltages exceeding 22 kV?

a. Development of both radial and tangential stress.
b. Formation of vacuous spaces and voids on loading and unloading owing to non homogeneity of dielectric in belted construction.
c. Local heating caused by power loss at the centre filling.
d. All of the above.

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Q6. The cable best suited for the transmission of voltages from 33 kV to 66 kV is_______________.

a. Belted cables
b. Screened cables
c. Pressure cables
d. None of these.

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Q7. What is/ are the advantages of using H-type cables?

a. The metallic screens assist in complete impregnation of the cable with the compound.
b. The metallic screens increase the heat dissipating power of the cable.
c. The lead sheaths in H type are thicker then S.L type cables.
d. All of these.

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Q8. What is the advantage(s) of screened type over the belted cables?

a. Reduced possibility of core to core faults.
b. Increased current carrying capacity.
c. No possibility of formation of voids within the dielectric.
d. All of the above.

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Q9. What is the gas pressure of SF₆ for a compressed gas insulated cable?

a. 10 – 20 mm Hg
b. 80 – 100 mm Hg
c. 3 – 5 kg / cm²
d. 40 – 50 kg / cm²

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Q10. Why are the ternary lead cables used near the railway tracks?

a. Because they have high tensile strength.
b. Have a low coefficient of thermal expansion.
c. Have low specific gravity.
d. Can withstand shocks and vibrations.

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Q11. Why solid type of conductors is not preferred for the voltages exceeding 66 kV?

a. A danger of breakdown of insulation.
b. Skin effect dominates the conductor.
c. There is corona loss between conductor and sheath material.
d. Insulation melts due to overheating.

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