Cochin University of Science and Techology (CUST) 2011-6th Sem B.Tech Electrical and Electronics Engineering BTech ,il - EE 602 ELECTRICAL MATERIAL SCIENCES (2002 Scheme) - Question Paper
BTS (C) - VI -11 - 012-H
B. Tech Degree VI Semester Examination April 2011
EE 602 ELECTRICAL MATERIAL SCIENCES
(2002 Scheme)
(i) Amorphous semiconductor
(ii) Organic semiconductor
(iii) Fabrication of pnp junctions
(iv) Solder material (20)
OR
II. (a) Discuss the properties and specifications of wire and cable materials. (15)
(b) Discuss the variation of conductivity with temperature. (5)
III. (a) Explain Claussiac - Mosotti relation. (10) (b) Explain the main features of ferro electricity. (10)
OR
IV. (a) Briefly explain dipolar relaxation. (10) (b) Derive an expression for electronic polarization in monoatomic gases. (10)
V. (a) Explain the classification of insulating materials on temperature basis. Give one
example for each class. (10)
(b) What are the factors influencing the dielectric strength of capacitor materials? (10)
OR
VI. Explain the mechanism of Dielectric break down in (i) solids (ii) liquids. (20)
VII. (a) Explain the Langevins theories ofdia and paramagnetism. (15) (b) Explain Corie - Weiss law. (5)
OR
VIII. (a) Write a short note on Hard and Soft magnetic materials. (10) (b) Write a brief technical note on ferromagnetism. (10)
IX. (a) What is super conductivity? What are its applications? (10) (b) Explain photo thermal conversions. (10)
OR
X. (a) Explain different types of fuses used and discuss about the properties of materials
used as fusing elements. (10)
(b) Explain photo voltaic conversions. (10)
***
|
Attachment: |
| Earning: Approval pending. |
