High Voltage Engineering-Previous Questions

 JNTUH R18 
BTECH EEE III-I SEM
HIGH VOLTAGE ENGINEERING
PREVIOUS QUESTIONS

1. What is Ionization process? Explain different ionization process in detail.
 2. Explain the streamer theory of breakdown in gases. 
3. What is thermal breakdown in solid dielectrics, and how is it practically more significant than other mechanics? 
4. Explain different theories of breakdown in commercial liquids. 
5. Give the concept of Townsend’s criteria of breakdown in gases. 
6. Define Townsend’s first and second Ionization coefficients. Explain the procedure of Townsend’s criterion for breakdown in detail. 
7. What is meant by Intrinsic strength? Explain intrinsic breakdown mechanism in solid dielectrics.
 8. What are commercial liquid dielectrics? How they differ from pure liquid dielectrics?
 9. Explain how the temperature affects the breakdown strength of solid dielectrics 
10. Explain the various mechanisms of breakdown phenomenon in commercial liquids. 
11. Explain how treeing and tracking leads to breakdown in solid insulating materials.
 12. Explain different methods for generation of high frequency AC voltages. 
13. What is meant by potential divider? How it is used for impulse voltage measurements. 
14. Discuss about Uniform and Non uniform fields. 15. Define Composite Dielectric. 
16. What are the differences between pure and commercial liquids? 
17. Derive the expressions for voltage ripple and regulation in a voltage multiplier circuit. 
18. Explain about tripping and control of impulse generators.
 19. What is paschen’s law? Explain how the temperature affects the breakdown strength of solid dielectrics?.
 20. State and explain Paschen‟s law. How do you account for the minimum voltage for breakdown under a given „p*d‟ condition? . 
21. Explain thermal breakdown in solid dielectrics and its significance. 
22. Explain streamer theory breakdown in gases. 
23. Describe the current growth phenomenon in a gas subjected to uniform electric fields.