Factors affecting the corona & corona loss - MCQs with Answers

Factors affecting the corona & corona loss - MCQs with Answers

Q1. Higher the frequency, _____________.

a. Lower the corona loss.
b. Higher is the corona loss.
c. Does not effect.
d. Depends on the physical conditions.

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Q2. Which harmonics are generated during the corona, which leads to the increase in corona losses?

a. Third harmonics.
b. Fifth harmonics.
c. Seventh harmonics.
d. None of these.

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Q3. What is the use of bundled conductors?

a. Reduces surface electric stress of conductor.
b. Increases the line reactance.
c. Decreases the line capacitance.
d. None of these.

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Q4. On which factor is the corona loss dependent on?

a. Material of the conductor.
b. Diameter of the conductor.
c. Height of the conductor.
d. None of these.

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Q5. In which climate does the chances of occurrence of corona is maximum

a. Dry
b. Hot summer.
c. Winter.
d. Humid.

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Q6. Corona loss can be reduced by using

1. Solid conductor.
2. Hollow conductor.
3. Bundle conductor.

a. 1 only
b. 1 and 2 only.
c. 1, 2 and 3 only.
d. 2 and 3 only.

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Q7. What is the effect on corona, if the spacing between the conductors is increased?

a. Corona increases.
b. Corona is absent.
c. Corona decreases.
d. None of these.

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Q8. Why are the hollow conductors used?

a. Reduce the weight of copper.
b. Improve stability.
c. Reduce corona
d. Increase power transmission capacity.

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Q9. Which of these given statements is wrong in consideration with bundled conductors?

a. Control of voltage gradient.
b. Reduction in corona loss.
c. Reduction in the radio interference.
d. Increase in interference with communication lines.

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Q10. Why are bundled conductors employed?

a. Appearance of the transmission line is improved.
b. Mechanical stability of the line is improved.
c. Improves current carrying capacity.
d. Improves the corona performance of the line.

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Q11. The effect of dirt on the surface of the conductor is to _____________ irregularity and thereby ________________ the break down voltage.

a. Decreases, reduces.
b. Increases, increases.
c. Increases, reduces.
d. Decreases, increases.

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Q13. Find the spacing between the conductors a 132 kV 3 phase line with 1.956 cm diameter conductors is built so that corona takes place, if the line voltage exceeds 210 kV (rms). With g_o = 30 kV/cm.

a. 1.213 m
b. 2.315 m.
c. 3.451 m.
d. 4.256 m.

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