Cochin University Previous Year Question Papers BE EE Electrical Material Science July 2009

Cochin University Previous Year Question Papers

BE EE Electrical Material Science July 2009

 V Semester

 

EE 504 Electrical Material Science 

(2006 Scheme)

PART-A

(Answer ALL questions’)

(All questions carry EQUAL marks)

 

I. a) Write a short note on magnetodynamics.

b) Distinguish between‘doping’and‘alloying.

c) Explain superconductivity and its practical applications.

In case of metals the conductivity decreases with temperature whereas in case of semi conductors it might decrease and increase as well. Explain qualitatively.

d) Discuss briefly the piezoelectric materials.

e) List out few materials used for solar cells and battery.

f) Discuss some alloys used for breaker contacts.

g) Explain magnetic resonance

h) Explain optical microscopy

PART-B

II   a) Explain the factors affecting the resistivity of Electrical materials.

b) Describe Fermi-Dirac distribution.

OR

III  a) Explain the principle of photoelectric emission.

b) Explain ferromagnetism. Give names of different ferromagnetic materials along with their application.

 

IV a) Explain electronic, ionic and dipolar polarization. How do they depend on frequency?

b) Explain the breakdown in gaseous, liquid and solid dielectrics.

OR

V  a) Explain important requirements of good insulating materials. Give examples with application.

(b)Mention properties of following insulating materials.

Glass

Rubber

Asbestos

Bakelite

VI. Explain different types r.f solar selective castings.

OR

7. Discuss various crossings for enhanced solar thermal energy collection.

(i) electron spin resonance

(ii) electron microscopy OR

(i) magnetic resoas & cc1

(ii) ferriage recouaace

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