Cochin University Previous Year Question Papers
BE EE Electrical Material Science Nov 2010
EE 504 Electrical Material Science
(Answer ALL questions)
I. (a) Explain free electron theory.
(b) Explain super conductivity and its practical applications.
(c) Write short note on the freq’uency dependence of dielectric constant and loss tangent.
(d) Explain dipolar relaxation.
(e) List out some materials used for solar cells and battery.
(f) What are the materials used for coatings for enhanced solar thermal energy collection?
(g) Write short note on ferromagnetic resonance.
(h) Discuss optical microscopy.
II. (a) Explain Fermi-Dirac distribution.
(b) Explain the variation of conductivity with temperature.
III. (a) Describe briefly a method of producing pure semiconductors and a method of growing junctions.
(b) Write a short note on magnetostriction.
IV. (a) Distinguish between electronic, ionic and orientation polarisation. How do they depend on frequency?
(b) Discuss briefly the pie zo electric materials.
V. (a) Explain the break down mechanism in gases, liquids and solids.
(b) What are the factors influencing the dielectric strength of a material? Discuss.
VI. Write short note on :
(i) Cold mirror coatings
(ii) Heat mirror coatings
(iii) Anti reflection coatings.
VII. Discuss the various coatings for enhanced solar thermal energy collection.
VIII. Write short note on :
(i) Electron microscopy
(ii) Nuclear magnetic resonance.
IX. Discuss :
(i) Electron spin resonance
(iii) Photo electron spectroscopy.