Pondicherry University 2010 B.Tech Electronics and Communications Engineering Material Science, s - Question Paper

part A - (10*2=20 marks)

ans all ques.
1. What is crystallographic axis?

2. describe the term space lattice.

3. What is dielectric loss?

4. describe electric polarization.

5. Distinguish ranging from hard and soft magnetic materials.

6. elaborate ferrimagnetic materials?

7. What is Meissener effect?

8. elaborate compound semiconductors? provide an example.

9. Mention the kinds of liquid crystals.

10. elaborate metallic glasses?

part B - (5*11=55 marks)

ans all ques.

11.(a) discuss the packaging factor for FCC and HCP structure.

(b) explain any 2 point defects that are responsible for crystal imperfections.

(or)

12. (a) Write notes on

i) Coordination number and
ii) Atomic radius.

(b) discuss edge dislocation and screw dislocation of crystal imperfection.


13. (a) Derive Clausius-Mossotti formula and discuss its use in predicting the dielectric constant of solids.

(b) Distinguish ranging from ferroelectrics and pyroelectric materials and provide an application every.

(or)

14. (a) discuss the experimental method to determine dielectric constant and loss using Scherring bridge.

(b) Briefly discuss the various kinds of dielectric polarizations.


15. (a) explain the hysteresis on the basis of domain theory of ferromagnetism.

(b) discuss the cause for the formation of domain structure in a ferromagnetic material.

(or)

16. discuss in detail the magnetic memories of the subsequent.

(a) Floppy disc.
(b) CD ROM
(c) Magnetic optical recording.

17. Derive an expression for carrier concentration in intrinsic semi conductor.

(or)

18. What is super conductivity? discuss various kinds of super conductor with examples.

19. define the properties and applications of metallic glasses.

(or)

20. explain the physical properties and applications of carbon nano tubes.

Earning:   Approval pending.