Question Paper Posted Date: 16 Sep 2009     Resource Type: Articles/Knowledge Sharing     Category: Educational Loans Author: K.Govindarajan Member Level: Silver     Rating: Points: 2

B.Tech. DEGREE EXAMINATION, NOVEMBER 2008 First/Second Semester (Common to all branches) MATERIAL SCIENCE Time: Three hours maximum: 75 marks Answer FIVE questions, choosing ONE from each Unit All questions carry equal marks. UNIT 1 1. Explain the following briefly (a) Miller indices (b) Bravai’s lattices (c) Unit cell (d) Atomic packing fraction. (3+4+4+4) Or 2. (a) Discuss in detail Bragg’s x-rays diffraction method with neat diagram. (b) What do you meant by co-coordinating number? (12+3) UNIT 2 3. Explain briefly following (a) Point defects (b) Line defects (c) Volume defects (d) Lattice vibration (3+4+4+4) Or 4. (a) Discuss in detail Einstein’s debye theory with neat diagram. (b) Define the term “Thermal Conductivity”. (12+3) UNIT 3 5. (a) Deduce Clausius Mosotti relation (b) Define “Dielectric loss”. (12+3) Or 6. (a) Explain briefly piezo electrics, ferroelectric and pyroelectric Materials with neat diagrams. (b) Write down their few applications (12+3) UNIT 4 7. (a) Explai the quantum theory of ferromagnetism and antiferromagnetism (b) Draw hysteresis curve and its parameters (10+5) Or 8. (a) Explain the following with examples, (1) Magnetic bubbles (2) Curie temperature (b) Explain different types of magnetic material with examples. (8+7) UNIT 5 9. (a) Define the “superconductors”. (b) Discuss in detail type 1 and type 2 superconductors. (c) What do you meant by compound semiconductor? (2+10+3) Or 10. (a) Explain the phenomenon of Hall effect with experimental setup. (b) Explain the properties of high temperature conductor with example.

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