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(b) What are ferrites? Give two applications of Ferrites.

11. (a) What are the properties of 516 gas as a dielectric material? Give one example.

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What is the effect when it is mixed with N2?

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(b) Write a note on common insulating materials with their applications?
PART ^

Answer any 2 questions

12. What are the mechanisms of breakdown in solid dielectrics? (10)

13. Explain the method of processing of Transformer oil? (10)

14. (೩) Enumerate the magnetic materials used in electrical machines and relays? (6)

(b) What is meant by spontaneous magnetization? Give examples of materials

exhibiting this property. (4)

PART D
Answer any 2 questions

15. a )Explain the difference between Type I and Type 11 superconductors on the basis of
Messner effect ? (6)
b) What are the materials used for making thin film solar cells? Give applications

of thin film solar cells .
16. a) Explain photo voltaic conversion. What are the advantages of solar power?

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b) Compare and contrast photo thermal conversion and photo voltaic conversion. (4)

17. Explain various techniques used for materials study. (10)

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