LEVEL 1

1. What is a plain break oil circuit breaker and what is its major drawback?
2. Write a note on water type circuit breaker.
3. What are the different type of air blast circuit breaker and explain them in brief.
4. What are the methods of arc extensions? Explain them in brief.
5. What is arc voltage?
6. What is restriking voltage?
7. What is recovery voltage?
8. What is current chopping?
9. What is resistance switching?
10. Explain the construction and working of SF6 Circuit breaker.
11. Types of SF6 Circuit breaker.

LEVEL 2

1. Explain the construction and working of Vaccum Circuit breaker.
2. How is transmission lines classified as? Explain them in brief.
3. What are the advantages and limitations of high transmission lines voltage?
4. What is kelvin’s law and what are its limitations?
5. Distinguish between A.C and D.C resistance of a conductor. Why the two differ?
6. Can you guess why feeders are subjected to more faults than any other power system equipments?
7. Attempt to analyse the distribution feeder post-fault data.8. Mention few widely used distribution feeder protection practices. Make a chart depicting the differences between transmission and distribution feeder protection practices.
8. Write down the role of distribution feeder fault analysis in deciding the rating of protection devices.
9. Mention varies types of feeder faults along with their causes.