Anna University www.annauniv.edu Model Question Paper : Chemical Engineering

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ANNA UNIVERSITY :: CHENNAI – 600 025
MODEL QUESTION PAPER
VI - SEMESTER
B.TECH. CHEMICAL ENGINEERING
CH338 – CHEMICAL ENGINEERING THERMODYNAMICS - II

http://www.annauniv.edu/academic/qp4.htm
http://www.annauniv.edu/academic/mqp5sem-ug/ch338.doc

Time: 3hrs Max Marks: 100

Answer all Questions
PART – A (10 x 2 = 20 Marks)

1.Define chemical potential. What is its physical significance?
2.What is the characteristic of an ideal solutions? State Lewis – Randall rule.
3.Give the condition of criteria for phase equilibrium.
4.Explain the maximum and minimum boiling azeotropes.
5.Name the activity coefficient – composition models of phase – equilibria. Explain Wilson equation.
6.What is the modified equation of Raoults’s Law?
7.State the standard Gibbs energy change of reaction.
8.How the equilibrium constant is related to gas phase compositions?
9.Define the coefficient of performance of a refrigerator.
10.Name the refrigeration cycles.

PART – B (5 x 16 = 80 Marks)

11.For the binary mixture of A and B, the activity coefficients are given by
ln?1 = A and ln?2 = A
The vapor pressure of A and B at 353 k are 119.96 kpa and 79.97 kpa respectively. Does an azeotrope exist at 353 k? If so, what is the azeotropic pressure and composition for A = 0.6.
12.a)Derive the Gibbs – Duhen equation for the calculation of solution properties from knowledge of the partial properties.
OR
12.b)Define exceed properties of mixtures and obtain the equation for activity coefficient.