IFS - Indian Forest Service Chemical Engineering Previous Year Paper (2002)
PAPER - I : SECTION A
1. Answer any four of the following: (10 × 4 = 40)
(a) What is the physical significance of Bernoulli’s equation? How can this equation be modified to account for friction losses?
(b) What are the laws of size reduction? Explain them, mentioning the ranges of their. applicability.
(c) Discuss the procedure for evaluating mass transfer coefficient using Wetted Wall Column.
(d) Discuss briefly the diffusion and capillary mechanisms involved in moisture movement in drying of solids.
(e) “By using the analogy suggested by Osborne Reynolds, develop a relation between heat transfer coefficient and friction factor.”
2. (a) Considering fluid flow through a circular pipe, derive the Hagen-Poiseuille equation.
(b) Explain the principle of Pitot tube.
(c) List three industrial filters, specially indicating their applications.
(d) Discuss the degree of mixing and determination of power of mixing. (10 × 4 = 40)
3. (a) Explain “Point efficiency”. Murphree tray efficiency and overall tray efficiency.
(b) Explain how to calculate minimum liquid—gas ratio for absorber.
(c) Explain how you would determine number of stages for double solvent extraction.
(d) Discuss Mier’s super saturation theory. (10 × 4 = 40)
4. (a) What are the effects of various operating conditions on overall heat transfer coefficient in an evaporator unit?
(b) What do you understand by geometric shape factor in thermal radiation 7 Determine the geometric shape factor for a very small disc of area dA and large parallel di4c of area A located above the smaller one.
(c) Differentiate between equivalent diameters for heat transfer and pressure drop for flow of a fluid through the annulus of a double pipe heat exchanger.
(d) With a neat sketch, describe briefly the scheme used for solar water heating. (10 × 4 = 40)
5. Answer any four of the following: (10 × 4 = 40)
(a) Discuss absorption and extraction type separation.
(b) Write the design procedure for flat heads.
(c) Explain cathodic protection to prevent corrosion.
(d) How do you find the frequency response of a PI controller? Explain.
(e) With a neat sketch, describe a suitable device for controlling the process outlet temperature of a heat exchanger that uses steam as the heating medium.
6. (a) Explain the theory of electrical separations.
(b) Discuss the electro-dialysis and its applications.
(c) Explain the parallel leaf-type ultra filtration module.
(d) Discuss on very low pressure distillation conducted industrially for heat-sensitive substances. (10 × 4 = 40)
7. (a) Discuss the criteria for shell failure based on theory of elasticity.
(b) Distinguish between External bolting chair and Centered anchor-bolt chair.
(c) Name the various types of heads used for closing ends of cylindrical shells, indicating their applications.
(d) Write the stepwise procedure for determining the standard plate thickness for fabricating a cylindrical shell operating at internal pressure. (10 × 4 = 40)
8. (a) Explain how strain gauge is used in pressure measurement.
(b) Discuss the working of an optical pyrometer.
(c) Derive the transfer function of an RC circuit. Show that the time constant of an RC circuit is the product of R and C.
(d) Explain the graphical rules for Bode plots. (10 × 4 = 40)
PAPER - II : SECTION A
1. Answer any four of the following:
(a) What is proximate analysis of Coal? How do you classify Coals? Give examples. (10)
(b) Discuss the Second Law of Thermodynamics and its applications. (10)
(c) What are the ideal reactors? Emphasize the basic assumptions. Write the performance equations for each of these reactors (No need for derivation). (10)
(d) Discuss the concepts of Effective Diffusivity, Effective thermal conductivity and Effectiveness factor. (10)
(e) Discuss the concepts of fugacity, activity and chemical potential. (10)
2. A natural gas having a composition of CH4: 80% (by vol), C2H6 : 8.0, C3H8 : 4.5, C4H10: 2.0, C5H12:1.0, CO2 :2.5 and N2: 2.0 is burnt with excess air in a burner. The burner gases contain (on dry-basis) CO2 : 10.3, N2 : 85.9 and O2 : 3.8. Calculate the per cent excess air supplied and also the composition of the burner gases on wet basis. (40)
3. Calculate the equilibrium constant for the vapour-phase dehydration of ethanol to ethylene at 350°C.
The reaction is :
Values of the constants in the heat capacity equation: (40)
4. What is the importance of pore-diffusion in gas-solid (porous catalyst) reactions? Derive an expression for the effectiveness factor for I order kinetics and single cylindrical pore. (40)
5. Answer any four of the following:
(a) What are the various raw materials! Feed stocks used to produce hydrogen in the manufacture of ammonia? (10)
(b) What are the various routes to produce VCM? Discuss their relevance to India. (10)
(c) How the industrial solid wastes are disposed? (10)
(d) What is the Environment (Protection) Act 1986? Discuss the provisions under it. (10)
(e) What are the various factors taken into consideration in laying out of a chemical plant? (10)
6. (a) What are the by-products/co-products of sugar manufacture and their uses? (10)
(b) Sugar plant is an example of total energy recovery concept. Elaborate. (10)
(c) Describe with a neat flow-sheet a modern sugar production plant. (20)
7. (a) What are the major industrial liquid pollutants (in the effluents) ? (10)
(b) List the techniques used for removal of dissolved organic solids. (10)
(c) Discuss the principle and operation of a Tricklebed filter (with a neat sketch) in liquid effluent treatment. (20)
8. (a) What is Project Scheduling? (10)
(b) What is the difference between PERT and CPM? (10)
(c) Draw up a typical PERT/CPM Charts for setting up a medium scale chemical plant. (20)