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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 II Question paper
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Code No: R05221803 Set No. 2
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. (a) Explain the engineering importance of di usion. State and Explain Fick’s first
and second law.
(b) Explain the phenomenon of di usion in all states of matter.
(c) Distinguish between thermal energy; kinetic energy and activation energy.
[5+5+6]
2. Distinguish between the following.
(a) Steady state and unsteady state of di usion.
(b) Di usivity and permeability. [8+8]
3. (a) Discuss the derivation and uses of the oxygen nomographic scale in Richard-
sons diagram.
(b) Discuss in detail about the properties of a single standard free energy change/temperature
line. [8+8]
4. (a) Define and explain the terms C
p and C
v and derive the thermodynamic rela-
tionship betweent them.
(b) Explain why Dulag-pesit law is not applicable at low temperatures.
(c) Define and explain the term molar heat. What are units in which it is ex-
pressed. [8+4+4]
5. (a) What are the di erences between lattice thermal conductivity e ects and
thermo electric e ects of solids.
(b) The volume of a cubical block of metal changes by 0.15%. When its tempera-
ture is raised by 30oC compute the coecient of linear expansion of the metal.
[8+8]
6. (a) What do you mean by ‘activity’ of a component? How it can explain the
behavior of a solution? Also explain about ‘activity coecient’ with suitable
example.
(b) Derive gibb’s-Duhem equation N1dG1 + N2dG2=0 from first principles. [9+7]
7. (a) What is the significance of phase rule? Discuss its applications and limitations.
(b) Explain the di erences between a liquidus line and solidus line. Explain how
the liquidus line is obtained for an eutectic system. [8+8]
8. (a) Di erentiate between electrochemical cells & electrolytic cells.
(b) Explain in detail about the concentration cells. [8+8]
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