GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Subject Name: Chemical Engineering Thermodynamics - I
Time: 10:30 AM TO 01:00 PM Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- IV (New) EXAMINATION - WINTER 2019
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Subject Code: 2140502 Date: 13/12/2019Subject Name: Chemical Engineering Thermodynamics - I
Time: 10:30 AM TO 01:00 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) State and explain the Zeroth Law of thermodynamics. | 03 |
| (b) Discuss briefly: (1) State and path functions (2) Closed and open systems. | 04 |
| (c) Derive equation for first law of thermodynamics for a steady state flow process. | 07 |
| Q.2 (a) Explain the principle of corresponding states. | 03 |
| (b) Explain in brief : Clausius Inequality. | 04 |
| (c) Show that for a van der Waals gas, | 07 |
| OR | |
| (c) Explain PVT behavior for a pure liquid with neat diagram. | 07 |
| Q.3 (a) State whether the following properties are extensive or intensive: (1) temperature, (2)pressure, (3) potential energy,(4) volume, (5) specific volume (6) heat capacity. | 03 |
| (b) Starting from basic principles, obtain various forms of Virial equation. Explain physical significance of Virial coefficients. | 04 |
| (c) 15 kg of water is kept at temperature of 35° C on one side of partitioned insulated vessel-while on the other side 30 kg of water at 75° C is kept. When the partition is removed, the two masses are mixed and uniform conditions are attained. Find (a) The overall entropy change of 45 kg of water. If 10% of total heat is lost to the atmosphere which is at 30° C. (b) The total change in entropy as a result of this process. Data: Average heat capacity of water =1 kCal/kg K. | 07 |
| OR | |
| Q.3 (a) Using Maxwell’s equation prove that : dH=CpdT + V(1 — β T) dP where β = Volume expansivity. | 03 |
| (b) Distinguish between steady state and equilibrium state. | 04 |
| (c) Show that the maximum fluid velocity attainable for flow through a pipe of uniform cross-section is equal to the sonic velocity. | 07 |
| Q.4 (a) State the third law of thermodynamics. | 03 |
| (b) Explain relation between sonic velocity, nozzle and Mach no. | 04 |
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| (c) The standard heat of reaction at 298 K for the following reaction is -164.987 kJ. CO2 (g) +4 H2 (g) → 2H20 (g) + CH4(g) Calculate standard heat of reaction at 773 K. Cp = α+βT+γT2, --- Content provided by FirstRanker.com --- Value of constants α, β and γ are given below (J/mol K). | |
| α β γ | |
| CO2 | 26.75 42.26x10-3 -14.25x10-6 |
| H2 | 26.88 4.35x10-3 -0.33x10-6 |
| H20 | 29.16 14.49x 10-3 -2.02 x 10-6 |
| CH4 | 13.41 77.03x10-3 -18.74 x 10-6 |
| OR | |
| Q.4 (a) Write a short note on Ejector | 03 |
| (b) Explain residual properties in brief. | 04 |
| (c) Discuss about thermodynamic diagrams. | 07 |
| Q.5 (a) Write a short note on throttling process or Joule — Thomson expansion | 03 |
| (b) Why work required in multistage compression with inter cooling is less than that in single stage compression for same compression ratio? | 04 |
| (c) Explain vapour compression refrigerant cycle with neat flow diagram and T-S diagram. | 07 |
| OR | |
| Q.5 (a) Explain working principle of Linde liquefaction process in brief. | 03 |
| (b) Discuss properties of a suitable refrigerant. | 04 |
| (c) A vapour compression refrigeration system with ammonia as the working fluid is to operate between 266 K and 300 K. Determine following: (a) COP, given that the enthalpy of saturated vapour at 266 K = 656 kl/kg and enthalpy of superheated vapour leaving the compressor = 724 kl/kg, enthalpy of saturated liquid at 300 K'= 144 kl/kg (b) COP of an ideal Carnot refrigerator. | 07 |
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