Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 7th Sem 2170407 Biochemical Engineering I Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2170407 Date:25/01/2021
Subject Name:Biochemical Engineering-I
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) How are cells classified?
03
(b) What is central dogma of life? Explain in brief.
04
(c) Derive the equation for batch reaction time required to reduce the
07
substrate concentration from s0 to sf in an enzymatic process.
Q.2 (a) What do you mean by recycle stream, bypass stream and purge stream?
03
(b) A continuous process is set up for treatment of wastewater. Each day,
04
105 kg cellulose and 103 kg bacteria enter in the feed stream, while 104
kg cellulose and 1.5 x 104 kg bacteria leave in the effluent. The rate of
cellulose digestion by the bacteria is 7 x 104 kg d-1. The rate of bacterial
growth is 2 x 104 kg d-l; the rate of cell death by lysis is 5 x 102 kg d-1.
Write balances for
Cellulose and bacteria in the system.
(c) Explain different modes of sterilization of liquids.
07
Q.3 (a) What do you mean by state properties?
03
(b) Draw a neat diagram of stirred tank reactor with proper annotations.
04
(c) Classify the fluids according to their rheological behaviour. Also show
07
their flow curve.
Q.4 (a) Compare packed bed, fluidized bed and trickel bed reactors.
03
(b) What is Reynold's number? Give its equation and significance.
04
(c) Explain various factors affecting broth viscosity.
07
Q.5 (a) Explain the terms bubble formation, gas dispersion and coalescence
03
(b) Explain Michaelis Menten Kinetics.
04
(c) Explain role of diffusion in a bioprocess.
07
Q.6 (a) What is total reaction rate, volumetric reaction rate and specific reaction
03
rate?
(b) Compare Lineweaver-Burk plot, Eadie-Hofstee plot, Langmuir plot and
04
Direct liner plot.
(c) Explain film theory in detail.
07
Q.7 (a) How the Cell Senses Its Extracellular Environment?
03
(b) What do you mean by overall yield, instantaneous yield, theoretical and
04
observed yield?
(c) Draw and explain Typical batch growth curve and state values of in
07
different phases.
1
Q.8 (a) What is max and ks? Give relation between them.
03
(b) What is kLa? What are ways to measure it?
04
(c) Explain principle and working of Cone-and-Plate Viscometer.
07
*************
2
This post was last modified on 04 March 2021