Pondicherry University 2011 B.Tech ,il\ -material science - Question Paper

B.TECH DEGREE exam APRIL\MAY 2011
MATERIAL SCIENCE

part -A [MARKS-10*2=20]

1.Name 7 crystal systems.
2.Define coordination number.
3.What are dielectrics materials?
4.What is meant by local field in dielectrics?
5.State the properties of soft magnetic materials.
6.Name few magnetic storage devices?
7.What are compound semiconductors?
8.The superconducting transition temperature of lead is 7.26K.The initial field at 0K is 64*10 power three amp/m.Calculate the critical field at 5K.
9.What are the basic kinds of ordering in liquid crystals?
10.What is meant by nanophase materials?


SECTION-B-[MARKS 5*11=55]
ans ALL UNITS, CHOOSING 1 ques. FROM every UNIT

UNIT -1
11. a. compute the atomic radius and coordination number for FCC lattices.
b. Prove that the packing factor of HCP is 74%.
or
12. a. discuss point and line defects obtained in solid materials with suitable diagrams.
b. define the powder X-ray diffraction method of crystal structure analysis.

UNIT -2
13. discuss the various kinds of polarisation mechanisms involved in a dielectric material.
or
14.Explain in detail piezoelectic , ferroelectric and pyroelectic materials with their applications.


UNIT -3
15.Distinguish b/w diamagnetic,paramagnetic,ferromagnetic,anti-ferromagnetic and ferromagnetic materials.
or
16.Explain the hystersis on the basis of domain theory of ferromagnetism.

UNIT-4
17. a. provide the theory of hall effect.
b.Using hall effect,how will you determine the electrical coductivity of a semiconductor?
or
18.Explain the following:
a. Meissener effect
b.Transition temperature
c.Type one and kind two superconductors.

UNIT -5
19. provide a detailed account on metallic glasses .their method of production,properties and applications.
or
20. Write short notes on carbon nano tubes and their applications.

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Earning:   Approval pending.