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Posted By: yamini Member Level: Gold Posted Date: 10 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Metallurgy & Material Technology II II MMT Metallurgical Thermodynamics aug/sep 2007 set III Question paper
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Code No: R05221803 Set No. 3
II B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007
METALLURGICAL THERMODYNAMICS
(Metallurgy & Material Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Define and explain the following:
(a) Di usion
(b) Solid state di usion
(c) Self di usion
(d) Hetero di usion. [4X4=16]
2. (a) Describe the mechanism of di usion from a limited source of dopants.
(b) Explain the factors that a ect the di usion rate in solid metal crystals. [8+8]
3. (a) Explain the condition of equillibrium of two-phase mixture of a pure substance
in terms of free energy.
(b) Explain the e ect of temperature on equillibrium constant.
(c) Distinguish between Gibb’s and Helmholtz free energies. What is their signif-
icance? [6+4+6]
4. (a) Describe ‘Debye’s theory’ of specific heats of solids. Explain the concept of
Debye’s temperature.
(b) Discuss the merits and defects of Debye’s model in comparision with Einstein’s
model in explaining specific heats of solids. [8+8]
5. (a) Why does thermal expansion occur in a material? What are the e ects of
potential energy and the temperature on the magnitude of thermal expansion
in important engineering metals?
(b) The coecients of expansion of a rock crystal in three orthogonal directions are
13× 10-7/0oC; 146× 10-7/0oC and 231× 10-7/0oC. Calculate its coecient
of cubical expansion. [9+7]
6. (a) State and explain Sievert’s law.
(b) Define activity of a substance. Indicate the relationship between activity and
mole fraction for an ideal solution. [6+10]
7. (a) Explain the concept of chemical potential and derive the expressions related
there in. Show that for any heterogeneous system of equillibrium, the chemical
potential of each component has identical values in all the phases.
(b) Disucss the graphical method of valuation of partial molal quantities from the
molal quantity. [9+7]
8. (a) Explain about the Galvanic cell its sign convention & representation.
(b) What are the reversible and irreversible cells, Explain about any one cell in
detail. [8+8]
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