Corona Interview Questions:

Following are the below Corona Interview Questions and Important Questions which is very useful for interviews and exams

1. Explain the phenomenon of corona. What are the factors affecting corona?

2. What is corona ? Explain briefly the factors which affect corona.

3. Explain the situation under which corona phenomenon starts in high voltage power transmission lines. Identify the factors that affect the corona alongwith reasoning.

4. Explain corona and discuss its effects on performance of transmission lines

5. Explain various factors which affect corona loss.

6. Explain the factors which determine the formation of corona on overhead lines. Derive an expression for the disruptive critical voltage between two smooth circular conductors assuming the breakdown strength of air to be 30 kV/cm (peak).

7. Deduce from first principles expressions for the disruptive critical voltage between two smooth circular wires. Find the ratio of critical voltages when the distance between the conductors is halved, other data remaining the same.

8. What is corona ? Show that the maximum critical disruptive voltage occurs when the radius of conductor is d/e where d is the distance between conductors.

9. Define with reference to corona the disruptive critical and visual critical voltages. Discuss the factors which affect these voltages.

10. State and explain the Peek’s empirical formula for calculation of corona power loss for a power transmission line.

11. Write and explain the expression for power loss due to corona. What factors affect the corona loss ?

12. Discuss advantages and disadvantages of corona. How can corona loss be minimized ?

13. Discuss the factors on which corona loss depends. Suggest different means of reducing corona loss.

14. How is corona affected by line voltage, atmospheric conditions and conductor size, shape and condition.

15. Explain the role of bundled conductors in reducing corona loss.

16. Explain ‘corona loss’ at extra high voltages and its disadvantages. How is disruptive critical voltage estimated ? What are the effects of ‘air density’, ‘temperature’ and ‘bundling’ of conductors on corona loss ?

17. Explain various methods of reducing corona loss.

18. Write short notes on the following:

• Phenomenon of corona.
• Corona.
• Factors affecting corona loss.
• Corona loss.
• Methods of reducing corona loss.