IFS Chemical Engineering 2000
Paper-I
Section A
1. Answer any four of the following: (10 × 4 40)
a. Develop an expression for predicting the minimum fluidisation velocity.
b. Explain about the penetration theory of mass transfer.
c. With a neat sketch, explain the working principle of a spray drier.
d. Discuss the merits and demerits of different feed conditions in a multiple effect evaporator.
e. Briefly explain about the effectiveness NTU method for the design of double pipe and shell, and tube heat exchangers.
2. Briefly explain the working principles of the following equipments: (10 × 4 40)
a. Ball mill
b. Plate-and-frame filter press
c. Pneumatic conveyor
d. Rotary pump.
3. Answer the following:
a. Write on equilibrium and differential distillation
b. What do you understand by bound moisture and unbound moisture of a solid material
c. Briefly explain about the design of cooling towers
d. Define the following:
I. Absorption factor
II. Theoretical number of plates
III. Optimum reflux
IV. Plait point
4. Answer the following:
a. Develop an equation for the radiative heat transfer between two concentric cylinders with diameters d1 and d2 and emissivities e1 and e2 radiating heat at temperatures T1 and T2 K respectively
b. Draw a neat sketch of the floating head heat exchanger with one pass on shell side and two passes on tube side and explain the function of its various components

Section B
1. Answer the following:
a. Explain clearly about
I. dialysis
II. osmosis
III. reverse osmosis
b. With neatsketches, explain the working principles of batch dialysis and continuous dialysis and types of equipments used for this purpose
2. Answer any four of the following: (10 × 4 40)
a. Explain clearly about ion-exchange separation process.
b. What are the materials generally used in process vessel construction? Briefly explain about the basic characteristics of
I. carbon steels
II. high alloy steels.
c. Mention about various types of supports for
I. vertical vessels
II. horizontal vessels.
With neat sketches, explain about saddle support and skirt support.
d. Enlist the different types of pyrometers. Describe the working principle of any one type of pyrometer.
e. Explain the importance of frequency response study in control system. Define corner frequency and mention its importance.
3. Calculate the cylindrical shell thickness, the conical roof thickness and the thickness of bottom plates for carbon steel (structural) conical roof storage tank to store 250, 000 litres of liquid of density 940 kg/m3. Slope of the roof-one in five. Superimposed load on the roof 125 kg/m2. Permissible stress in steel 1450 kg/cm2. Specific gravity of steel 7.7. Modulus of elasticity 2 × 106 kg/cm2 Assume diameter of the tank equal to its height. Draw a free-hand sketch of the tank indicating the essential fittings on it
4. Answer the following:
a. How do you measure liquid level if
I. the liquid is corrosive
II. the liquid contains suspended solid particles? Suggest the instruments to be used in these two cases. Briefly describe their principles of functioning
b. Write about the following:
I. Control valve characteristics
II. Block diagram
III. PID controllers