07a10801 Introduction To Chemical Engineering

Set No. 1

Code No: 07A10801

I B.Tech Regular Examinations, May/Jun 2008 INTRODUCTION TO CHEMICAL ENGINEERING (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain the dimensional similarity. (b) Explain Bucking method of dimensional analysis. (c) Write the physical significance of Reynolds number, Froude number, Euler number, Nusselt number. [4+4+8] 2. (a) Define Yr and Yp . (b) Explain the dew point and molar humidity. (c) Obtain relation between Yr and Yp . When are both equal.

[6+5+5]

3. (a) State and explain one dimensional and three dimensional flow. (b) Explain the characteristics curves of centrifugal pump.

[8+8]

4. Write notes on multiple effect evaporation and methods of feeding with suitable diagram. [16] 5. (a) Explain the process of diffusion with help of molecular theory. (b) Describe about the rate of diffusion in solids, liquids and gases. (c) Define diffusivity and give units. What are the variables which effect diffusivity. [5+6+5] 6. Discuss in details the following: (a) Equilibrium distillation (b) Differential distillation.

[8+8]

7. (a) Write about the selection of dispersion phase for liquid-liquid extraction. (b) Describe rotating disk and centrifugal extractors.

[8+8]

8. (a) Define free moisture content. (b) Explain constant rate period and falling rate period. (c) What is penduler state?

[4+8+4] ⋆⋆⋆⋆⋆

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Set No. 2

Code No: 07A10801

I B.Tech Regular Examinations, May/Jun 2008 INTRODUCTION TO CHEMICAL ENGINEERING (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Differentiate between crushing and grinding. (b) Explain the applications of size enlargement. (c) Write short notes on electrodialysis.

[6+6+4]

2. (a) Describe the different types of flow diagram. (b) Differentiate between bypass, purge and recycle.

[10+6]

3. (a) Define fluid and classify the fluids with suitable examples. (b) Differentiate between single and multi stage pumps. (c) What is pump? Explain briefly reciprocating pumps.

[8+4+4]

4. (a) Define log mean temperature and log mean area. (b) Explain the significance of heat transfer coefficients. (c) Write the classification of heat transfer equipments.

[4+4+8]

5. (a) What are absorption and desorption processes? Explain with suitable examples. (b) Absorption and Desorption processes may be handle in two ways what are they? Explain. (c) Describe the essential features and operation of packed absorption column and mention the three main steps in its design. [4+4+8] 6. Compare the packed towers with tray towers and also discuss merits & demerits. [16] 7. (a) Draw a neat sketch of a triangular diagram and explain how the binodal curve and tie- line can be represented for the system. (b) What are the differences between a countercurrent and a crosscurrent cascade? (c) In a ternary extraction system, what are the solute, solvent, and carrier? [6+6+4] 8. (a) Explain divided fixed bed reactor with inter cooling between catalyst beds. (b) Differentiate between fluidized and semi fluidized beds. ⋆⋆⋆⋆⋆

1 of 1

[10+6]

Set No. 3

Code No: 07A10801

I B.Tech Regular Examinations, May/Jun 2008 INTRODUCTION TO CHEMICAL ENGINEERING (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Discuss briefly: (a) Flotation (b) Filtration.

[2×8=16]

2. Define material balance and enumerate the different steps to follow in material balance calculations. [16] 3. (a) What is fluid? Describe the nature of a fluid. (b) Distinguish between laminar and turbulent flow. Draw the velocity profiles in pipes for various types of flows. [8+8] 4. (a) Explain the mechanism of heat transfer by thermal radiation. (b) What is a perfectly black body and describe Fery’s black body? (c) State the following and explain: i. Stefan’s-Boltzmann law ii. Plank’s law.

[4+4+8]

5. (a) Obtain the expressions for height of absorption column in terms of overall gas phase mass transfer coefficient. (b) What is necessary condition for absorption to take place? Define active component. (c) Define Fick’s law of diffusion.

[8+4+4]

6. (a) What is reflux and reflux ratio (b) Write short notes on applications of distillation (c) Write short notes on azeotropes (d) Name minimum four types of packing materials.

[4+4+4+4]

7. Write short notes on: (a) Mixer settler (b) Pulse column (c) Triangular diagram (d) Bubble cap.

[4×4] 1 of 2

Set No. 3

Code No: 07A10801 8. (a) Explain in detail about adsorption.

(b) Differentiate between reactivation and regeneration. (c) Write short notes on Vander Waals adsorption. ⋆⋆⋆⋆⋆

2 of 2

[8+4+4]

Set No. 4

Code No: 07A10801

I B.Tech Regular Examinations, May/Jun 2008 INTRODUCTION TO CHEMICAL ENGINEERING (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Discuss briefly: (a) Flotation (b) Screening.

[2×8=16]

2. (a) Energy associated with mass be classified in a number of ways. What are these? (b) What are the different ways by which energy that is not associated with in the mass classified? (c) Define standard heat of reaction and discuss about heat of reaction at constant pressure and constant volume. [5+2+9] 3. (a) With the help of a neat figure discuss about the development of a boundary layer on a flat plate. (b) Write the expression for thickness of boundary layer if the boundary layer is laminar and turbulent, respectively. [12+4] 4. (a) Explain the mechanism of heat transfer by thermal radiation. (b) What is a perfectly black body and describe Fery’s black body? (c) State the following and explain: i. Stefan’s-Boltzmann law ii. Plank’s law.

[4+4+8]

5. (a) Mass transfer may occurs in different ways, name any five. (b) What are phenomena that must exists in a mass transfer opeartion. (c) There are many similarities and differences between various mass transfer operations mention them. [5+3+8] 6. (a) Derive Rayleigh’s equation and mention assumption involved in it. (b) Write short notes on selection of equipment for gas-liquid operations.

[8+8]

7. (a) Write short notes on: i. Cross current ii. Counter current. (b) Explain the terms “extract” and raffinate. 1 of 2

[10+6]

Set No. 4

Code No: 07A10801 8. (a) Explain tray drier with neat sketch.

(b) Differentiate between wet bulb and dry bulb temperature. ⋆⋆⋆⋆⋆

2 of 2

[10+6]