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problem 1: What are the various dielectric materials according to their physical nature?

problem 2: Describe about surge voltages their distribution and control?

problem 3: Describe in brief the different numerical methods available for estimation of electrical field distribution in dielectric media?

problem 4: Discuss in brief about charge simulation method for solving field problems and estimation potential distribution.

problem 5: Describe the relative benefits and drawbacks of different numerical methods for solution of field problems?

problem 6:

a) Obtain the number of collision/second and the average time between two collisions, if the average velocity of the gas in the gap is 500m/s and mean free path is 107 m.

b) Derive the expression for collision cross-section in terms of mean free path.

problem 7: Describe in detail about thermal breakdown method in commercial liquids.

problem 8:

a) Describe short term and long term breakdown mechanisms which occur in a composite solid dielectrics.

b) Describe in brief about various solid dielectrics used in practice.

problem 9: prepare brief notes on:

a) Photo-ionization.
b) Secondary ionization.

problem 10: Define Townsend's first and second ionization coefficients. Describe the Townsend's criterion for a spark breakdown.

problem 11: Describe about Paschan’s Law of break down in gases?

Electrical & Electronics, Engineering

• Category:- Electrical & Electronics
• Reference No.:- M93655

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