Cochin University Previous Year Question Papers
BE EE Electrical Material Science June 2011
EE 504 Electrical Material Science
(Answer all questions)
I. (a) Explain the energy levels of a molecule.
(b) Differentiate between hard and soft magnetic materials.
(c) Define dielectric strength.
(d) Explain the behavior of dielectrics in alternating fields.
(e) What are the materials used for solar cells? Discuss.
(f) Explain about the materials used for antireflection coatings.
(g) Explain the phenomenon of ferromagnetic resonance.
(h) Write short note on optical microscopy.
II. (a) Explain briefly on the effect of temperature on electrical conductivity of metals.
(b) Explain superconductivity.
III. Write short notes on:
(i) Fermi Dirac distribution
(ii) Thermionic emission
(i) Photoelectric emission
IV. Explain briefly about the polarization of dielectrics in static fields.
V. Explain about the important requirements of good insulating materials.
VI. Explain about the different materials for special application such as solar cells, fuel cells and batteiy.
VII. Explain about the sintered alloys for breaker contacts.
VIII. Write short notes on:
(i) magnetic resonance
(ii) nuclear magnetic resonance
(ii) electron spin resonance
IX. Discuss about:
(i) atomic absorption spectroscopy
(ii) electron microscopy
(iii) photoelectron spectroscopy