Chemical Engineering

Code No: 410859 IV B.Tech I-Semester Supplementary Examinations, May 2004

OR

BIO-CHEMICAL ENGINEERING (Chemical Engineering) Max. Marks: 70 Answer any Five questions All questions carry equal marks ---

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Time: 3 hours

Explain the structure of Algae and Protozoa and their industrial applications.

2.

Derive the rate expression for reversible two substrate reaction.

3.

An enzyme requires the presence of a bound cofactor for the enzyme to be in the catalytically active form. The cofactor binds very tightly to the enzyme. A critical group on the cofactor has a pk of pkc and the cofactor is only functional when in the deprotonated form. The first pk values of the enzyme active site on either side of the pH of maximum activity are pk1 and pk2. Derive appropriate velocity expressions for the conversion of a single substrate to products when the following conditions apply. (a) pkc  pk1  pk2 (b) pk1  pkc  pk2 (c) pkc = pk1

4.

Briefly discuss the producers for enzyme immobilization by polymer entrapment.

5.

Explain in detail biosynthesis of small molecules.

6.a) b)

Describe chemostat with a neat diagram. Derive the expression for dilution rate.

7.

Describe with a neat sketch an ideal fermentor for an aseptic process.

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1.

Draw a neat diagram of an air lift fermentor and explain its working.

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8.

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