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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

FOURTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2018

Max. Marks:100

10.

Course Code: EE206
Course Name: MATERIAL SCIENCE

PART A

Answer all questions.

. How the dielectrics are thermally classified? (5)

What are compound semi conductors ? specify examples with application (5)

Explain Townsend criteria for breakdown of gaseous dielectrics (5)
Derive Curie- Weiss law for magnetic materials. Explain ferromagnetism (5)
What is carbon nano tube? Give its application (5)
Define super conductivity. What are the applications of superconductive

materials in electrical engineering (5)
What are the classification of solar cells based on their technology? (5)
Write note on atomic absorption spectrography (5)

PART 8

Answer any 2 questions

Duration: 3 Hours

(a). What is meant by mobility, mean freepath, and relaxation time in conduction

Phenomenon?

(b).Why carbon is used as brush in electrical machines?

(6)

(4)

(a) Explain the difference in conduction properties of conductors, semiconductors

and insulators on the basis of energy band diagram?

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(6)