GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- III (New) EXAMINATION — WINTER 2019
Subject Code: 3132105
Subject Name: Materials Thermodynamics
Date: 30/11/2019
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Time: 02:30 PM TO 05:00 PM
Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Marks | |
|---|---|
| Q.1 (a) Define system and give example. | 03 |
| (b) Classify system and explain with suitable example. | 04 |
| (c) Derive combined equation of 1st and 2nd law of thermodynamics in terms of internal energy, enthalpy and free energy. | 07 |
| Q.2 (a) Which equation rules the state of system? State it. | 03 |
| (b) Compare extensive and intensive properties. | 04 |
| (c) Apply Hess law and importance with suitable example. | 07 |
| OR | |
| (c) State 1st law of thermodynamics give its significance. Explain concept proposed by it. | 07 |
| Q.3 (a) Based on which law temperature measuring equipment are designed? State it. | 03 |
| (b) Prove that Cp>Cv. | 04 |
| (c) Interpret Kirchoff’s law and importance with suitable example. | 07 |
| OR | |
| Q.3 (a) Define Specific Heat (C). | 03 |
| (b) Define Cp and Cv. | 04 |
| (c) Derive relationship,Cp— Cv =R. | 07 |
| Q.4 (a) Identify enthalpy (H) and Heat (q). | 03 |
| (b) What is equilibrium? Explain different equilibrium. | 04 |
| (c) What is concept of free energy? Relate different type of free energy: | 07 |
| OR | |
| Q.4 (a) Interpret activity and fugacity. | 03 |
| (b) Examine possibility to pass on heat from lower temperature to higher temperature. Defend your answer. | 04 |
| (c) Contrast Raoult’s, Henry’s and Sievert’s law. | 07 |
| Q.5 (a) What is solution and ideal solution? | 03 |
| (b) Explain concept of entropy and 3rd law of thermodynamics. | 04 |
| (c) Demonstrate use of Ellingham diagram in metallurgy and discuss important characteristics. | 07 |
| OR | |
| Q.5 (a) Calculate free energy change at 500 K for following reaction: CuO (s) + H2 (g) = Cu (s) +H2O (g) ?H500= -87 kJ/mol and ?S500= 47 J/K/mol. | 03 |
| (b) Standard enthalpy change for CuS (s) + O2 (g) ? Cu (s) + SO2 (g) | 04 |
| CuS | CuO | Cu(l)|SO2(g) | |
| ?Hf kJ/mol | -53.1 -156.7 -10 296.8 |
| (c) Brass contains 70% Cu, 30% Zn with atomic weight 63.54 and 65.38 respectively. Calculate the composition of brass in atom %. Also calculate the atom fractions of Cu and Zn in above brass. | 07 |
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