IFS Chemical Engineering 2006
Paper-I
Section A

1.Answer any four of the following (10 × 4 40)

a.Answer the following questions

i.How is friction factor defined and what are the parameters on which it is dependent

ii.What are the different types of conveyers available for bulk solid transportation

b.Distinguish between Adiabatic Saturation Temperature and Wet Bulb temperature. Explain why both these are same for air-water system

c.Discuss caking of crystals and its prevention

d.Distinguish between resistances in series and resistances in parallel through which heat is being conducted under steady-state condition. Explain using electrical analogy

e.Differentiate among nucleate boiling, pool boiling and subcooled boiling

2.Answer the following questions

a.How do you use stress-strain relationship to explain the rheological classification of fluids? Explain with examples

b.Derive the continuity equation. State the assumptions

c.Answer the following questions

i. List the advantages and disadvantages of plate and frame filter press

ii.State the two laws of crushing and write suitable mathematical relationships for the two laws

d.Answer the following questions

i.Explain the basis for the selection of mixing impellers

ii.Briefly explain the mechanism of fluidization

3.Answer the following questions

a.Answer the following questions

i. Bring out clearly the concept of film transfer coefficient and overall transfer coefficient in mass transfer

ii.Explain briefly the diffusivity of gases and liquids

b.Answer the following questions

i. Discuss the mass transfer resistances in a wetted column

ii.Write briefly on Shank system of leaching

c.With a neat drying rate curve, explain different zones of drying

d.What a1e the limitations of McCa1e-Thiele method? How are these overcome in Ponchon-

Savarit method

4.Answer the following questions

a.Answer the following questions

i. What is LMTD, and why and where is it used

ii.Obtain the relationship between individual and overall heat transfer coefficients

b.Answer the following questions

i. State and explain the Stefan-Boltzmann law of radiation

ii.Write a note on absorption of radiation by opaque solids

c.Answer the following questions

i. What is the influence of boiling point elevation on evaporator performance

ii.Briefly describe a vapour compression evaporator

d.Write the design procedure for a double pipe heat exchanger

Section B

5.Answer any four of the following (10 × 4 40)

a.Explain the principle, of reverse osmosis. What are its limitations and applications

b.List out the factors to be considered in the design of vessels

c.Name the different supports used for process vessels mentioning their advantages and disadvantages

d.Explain with sketches the working principles, installation and applications of thermocouples for temperature measurement

e.Explain the working of a PID control system. Draw a pneumatic control circuit for this system and explain the characteristics

6.Answer the following questions

a.Explain the principle of ultra filtration and list out its industrial applications

b.Discuss the industrial applications of ion exchange process

c.Explain any two methods for separating a binary liquid mixture stating the underlying principles

d.Explain the working of an instrument based on electro dialysis

7.Answer the following questions

a.Explain the design equations for calculating the thickness of cylindrical and spherical shells. How will you select a standard plate for fabricating a shell

b.Write down the stepwise procedure for the design of an elliptical head

c.Name the different stresses acting on a tall vessel which is to be installed in a seismic zone

d.Mention any five industrially important alloys of Nickel and Copper. Give their approximate composition and application

8.Answer the following questions

a.With a neat diagram, describe the radioactive vacuum gauge method for measuring pressrue in a process industry

b.Sketch the following function and obtain the Laplace transform

c.Answers the questions below

i. Explain in practical terms, how one tunes a feedback controller for an existing process in a chemical plant

ii.Define phase margin and gain margin, and show how you can compute them from

Bode Plot

d.Develop a transfer function between the pressure drop and the manometer reading h for a mercury manometer. List the assumptions made