5HC - Chemical Engineering Thermodynamics - October 1998
Part A (20 x 2 = 40 Marks) Answer All Questions
Part B (5 x 12 = 60 Marks)
Or
(b) Derive Vander Waals equation of state
(c) Derive an expression for the efficiency of Carnot cycle and show it is independent of the working fluid
(b) A triple stage compressor takes air at the rate of 5 kg/min at 150 kPa and 298 K and delivers at a pressure of 6000 kPa. If the index of compression is 1.3, what is the minimum driving power required if the mechanical efficiency is 80%.
Or
(c) 1 kmol of methane is stored in a container of 0.12 m3 volume. What is the pressure using
(i) Ideal gas law (ii) Redlich-Kwong equation (iii) Vander Waals equation.
Given Z = 0.83, Pc = 46 bar, Tc = 190 K
(d) A Carnot refrigerator is used to maintain a space at 0oC while the outside temperature is 25oC. Find the C.O.P., mass of refrigerant required and power required if the capacity is one ton.
Or
(b) (i) Write a brief note on prediction of activity coefficients for binary system
(ii) Prove: (¶ CP/¶ P)T = -T(¶ 2V/¶ T2)P
(b) X-Y form azeotrope at 25oC containing 80% 'X'. Find Van Laar consatants. The vapor pressure of 'X' and 'Y' at 25oC is 700 and 710 mm Hg. Total pressure is 760 mm Hg. What is the composition of a vapor in equilibrium with liquid conatining 30% 'X'.
Or
(c) How will you use the correlatory methods to check whether the vapor liquid equilibrium data, say, for a binary system determined experimentally are accurate? (8)
(d) Write a short note on Wilson equation (4)
(b) For a reaction A Û 2B, the equilibrium constant at 500oC is 0.3. The standard heat of reaction is 500 kCal/kmol. Calculate, making suitable assumptions, the equilibrium constant at 200oC.
Or
(c) What are the criteria of phase equilibrium
(d) What are homogeneous and heterogeneous chemical reactions? Explain them with suitable examples.
Last Modified on: 04-Feb-2022
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