III B.Tech I Semester Supplimentary Examinations, May/Jun 2009 METALLURGICAL THERMO DYNAMICS (Metallurgy & Material Technology) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Explain under what conditions can Fick’s first law be used to solve diffusion problem.
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(b) In a diffusion anneal, to what level should the initial temperature of 900o C be increased to double the depth of penetration? Do = 0.4m2 /sec and ε = 100 KJ/mol. [8+8] 2. (a) How the impurities can generate defects and increase diffusivity? Explain with reference to interstecial diffusion.
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(b) Calculate the average diffusion constant in the binary alloy of Au0.9 N i0.1 using Fick’s law. The activation energy for the diffusion of Au in Ni as well as in Au is 42 Kcal/mol while for Ni in Au it is 65 Kcal/mol. [8+8]
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3. (a) Calculate the equilibrium constant for the reaction N iO + H2 = N i + H2 Oat750o C from the following data: Ni + 1/2 O2 = NiO ∆Go = −58, 450 + 2355T cal H2 + 1/2O2 = H2 O ∆Go = −58900 + 13.1T cal
(b) Calculate the CO/CO2 ratio in equilibrium with Carbon at 727o C assuming that the total pressure to be 2 atm. 2C + O2 = 2CO ∆ Go 1000 = -95.3 kcal C + O2 = CO2 ∆ Go 1000 = -94.0 kcal [8+8]
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4. (a) Describe ‘Debye’s theory’ of specific heats of solids. Explain the concept of Debye’s temperature.
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(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. Explain the following: (a) Seebeck effect
(b) Thomson effect (c) Peltier effect.
[5+6+5]
6. (a) What are the properties of solution that can be studied with the help of Gibbs Duhem equation? Explain them in detail. (b) Write a short notes on Sievert’s law 1 of 2
[8+8]
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Code No: NR311804
7. (a) What is the significance of phase rule? Discuss its applications and limitations. (b) Explain the differences between a liquidus line and solidus line. Explain how the liquidus line is obtained for an eutectic system. [8+8] 8. (a) Distinguish between ordered crystals and disordered crystal. [8+8]
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(b) Explain about volume defecrts and line defects in a crystal.
NR311804 III B.Tech I Semester Supplimentary Examinations, May ...
1. (a) Explain under what conditions can Fick's first law be used to solve diffusion · problem. (b) In a diffusion anneal, to what level should the initial temperature ...
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III B.Tech I Semester Supplimentary Examinations, May/Jun 2009 · PETROCHEMICAL ENGINEERING · (Chemical Engineering) · Time: 3 hours · Max Marks: 80 · Answer any FIVE Questions · All Questions carry equal marks · ***** · 1. Explain Refining of Crude p
i. an Induction Motor of 40 HP, with 0.8 p.f. and efficiency 0.85 · ii. a synchronous motor of 25 HP, with 0.9 p.f. leading and efficiency 0.9 · iii. Lighting load of 10 ...
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4. (a) Use Warshall's algorithm to find the transitive closure of the relation [10+6] · R = {(1,2)(1,3)(1,4)(2,3)(2,4)(3,4)} · (b) Are the simple graphs with the following ...
