Download SGBAU B-Tech 5th Sem Chemical Engineering Thermodyamics Question Paper

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B.Tech. Fifth Semester (CHE. Tech. (Food, P & P, O & P and Petro.) (CBS)

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Time : Three Hours Max. Marks : 80

Notes:

1. Answer Three questions from Section "A" and three questions from Section "B".
2. Due credit will be given to neatness and adequate dimensions.

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3. Assume suitable data wherever necessary.
4. Diagram and Chemical equations should be given wherever necessary.
5. Illustrate your answer necessary with the help of neat sketches.
6. Use of pen Blue/Black ink/refill only for writing the answer book.

SECTION - A

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1. a) Define entropy, enthalpy and internal energy of a system. How much is the entropy change for a reversible process and irreversible process?
   b) Explain the types of thermodynamic systems and thermodynamic processes with suitable examples.
   OR
2. a) State and explain first law of thermodynamics and extensive and intensive properties of a system.
   b) What do you mean by thermodynamic equilibrium? In a certain process, 350 Joules of heat is absorbed by a system, while 95 Joules of external work is done on the system. What is the change in internal energy of the process?

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3. a) How is second law of thermodynamics stated by Clausius and Ludwig Boltzmann and how to evaluate performance of a heat engine?
   b) State and explain Maxwell relations. One mole of a gas (Cv =12.55J/ mol k)at 300°C is compressed adiabatically and reversibly to one fourth of its original volume. What will be the final temperature of gas. R = 8.314.
   OR
4. a) Explain the concept of free energy and residual entropy of a system with some example.
   b) Explain coefficient of thermal expansion and the relationship between Cp and Cv .3 moles of hydrogen gas is compressed isothermally and reversibly from 60 dm³ to 20 dm³ and 8.22 kJ of work is done on it. What will be the temperature of gas? R = 8.314

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5. a) Explain Gibbs Duhem equation and solubility law.
   b) What are excess thermodynamic properties.
   OR
6. a) Explain the term fugacity and chemical potential of a system.
   b) What are partial molar and apparent molar properties?

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SECTION - B

1. a) How to compare ideal and non-ideal systems? Also explain the construction of x-y diagram.
   b) How to construct an equilateral triangle diagram? Explain with suitable example.
   OR
2. a) What is phase rule? Explain the meaning of each term involved in phase rule.
   

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   b) Explain Rault's law and Henry's law with suitable example.
3. a) What do you understand by partition function and how is it related with thermodynamic functions?
   b) Derive Boltzmann distribution law and explain its application.
   OR
4. a) Discuss thermodynamic probability and its relation with entropy.
   

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   b) Explain the techniques to search thermodynamic data of a system.
5. a) Explain various representations of equilibrium constant and the significance of free energy change.
   b) 1.5 moles of H₂ and 5.2 moles of I₂ are mixed and allowed to attain equilibrium at 500°C. At equilibrium, the concentration of HI is found to be 10 mol. Calculate the equilibrium constant for the formation of HI.
   OR
6. a) Explain the effect of temperature on equilibrium constant.
   

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   b) 1.6 moles of PCl₅ (g) is placed in 4 dm³ closed vessel. When the temperature is raised to 500° K, it decomposes as: PCl₅(g) ⇌ PCl₃(g) + Cl₂(g). At equilibrium 1.2 moles of PCl₅ remains. Calculate the value of equilibrium constant for the decomposition of PCl₅.

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