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Reg No.:_ Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FOURTH SEMESTER B.TECH DEGREE EXAMINATION(S), DECEMBER 2019
Course Code: EE206
Course Name: MATERIAL SCIENCE

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries 5 marks Mark
1 Explain how the conductivity of conducting materials vary with temperature and (5)
composition
2 What do you mean by ferroelectricity? Name any two ferroelectric materials. (5)
3 What are the factors influencing ageing of insulators? (5)
4 Differentiate between soft and hard magnetic materials. (5)
5 What are the materials used for the solar sell? (5)
6 Why solar selective coating is used in solar system? (5)
7 What do you mean by optical microscopy? Explain with diagram. (5)
8 How the nanomaterials are classified? (5)
PART ‏تا‎
‎Answer any two questions, each carries 10 marks
9 ஐ Explain the behaviour of dielectrics in alternating field. (7)
b) Name any three alloys of copper and explain its composition. (3)
10 a) Explain physical and chemical properties of SF6. (6)
b) What are the polymeric organic materials used in electrical apparatus? (4)
11 a) Why 56 gas is mixing with nitrogen for industrial applications? (4)
b) What are the materials used for solders and contacts? (6)
PART ட
Answer any two questions, each carries 10 marks
12 a) Explain the mechanism of breakdown in gases dielectrics (7)
b) Why transformer oil testing is so important? (3)
13 a) Explain the classification of magnetic material based on magnetic diploes. (6)
b) What is ferrites? Explain its properties (4)
14 a) Derive the Townsends current growth equation for primary ionization. (5)
b) Write five applications of iron alloys. (5)

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