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Biochemical Engineering
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Fermentation Kinetics
Comments
Question
In wastewater treatment, which bioreactor is generally used?
Options
A. Plug flow reactor
B. Trickle bed reactor
C. Tower fermentor
D. CSTR
Correct Answer
Trickle bed reactor
Fermentation Kinetics problems
Search Results
1. The height to diameter ratio (H/D) for the tank fermenters is
Options
A. <3
B. >3
C. <1.5
D. >1.5
Show Answer
Scratch Pad
Discuss
Correct Answer: <3
2. The application of just in time (JIT) manufacturing techniques in biotechnology is important because
Options
A. raw materials used in biotechnology are biodegradable
B. the products of biotechnology are biodegradable
C. it is a very competitive business (d) all of the above
D. all of the above
Show Answer
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Discuss
Correct Answer: all of the above
3. The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of
Options
A. higher oxygen transfer rates
B. a small sparge ring
C. better heat transfer efficiencies
D. all of these
Show Answer
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Discuss
Correct Answer: better heat transfer efficiencies
4. Which of the following statements would be appropriate while comparing bubble column and air lift fermenter of the same size?
Options
A. The average bubble size is smaller in an airlift bioreactor
B. Oxygen transfer rate is higher in an airlift bioreactor
C. The surface area for gas exchange is higher in an airlift bioreactor
D. All of the above
Show Answer
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Discuss
Correct Answer: All of the above
5. Stirred tank fermenter (STF) can be employed for
Options
A. aerobic fermentation of a wide range of cells including microbial, animal and plant cells
B. anaerobic fermentation of a wide range of cells including microbial, animal and plant cells
C. Both (a) and (b)
D. anaerobic fermentation of plant cells only
Show Answer
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Discuss
Correct Answer: Both (a) and (b)
6. A culture in a closed vessel to which no additional medium is added and from which no waste products are removed is called a __________ culture.
Options
A. continuous
B. batch
C. fed-batch
D. semi continuous
Show Answer
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Discuss
Correct Answer: batch
7. During the log phase cell numbers increase exponentially
Options
A. because cells produce enzymes
B. because cells do not have cell membranes
C. because cells are autocatalysts
D. because the rate of cell division increases exponentially
Show Answer
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Discuss
Correct Answer: because cells are autocatalysts
8. The diameter of the baffles in a standard stirred tank bioreactor ranges from
Options
A. 1/10
th
- 1/12
th
of the tank diameter
B. 1/3
rd
- 1/4
th
of the tank diameter
C. 1/15
th
- 1/20
th
of the tank diameter
D. 1/20
th
- 1/25
th
of the tank diameter
Show Answer
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Discuss
Correct Answer: 1/10
th
- 1/12
th
of the tank diameter
9. The advantage of airlift bioreactors over stirred tank bioreactors of a similar size is
Options
A. higher oxygen transfer rates
B. more uniform shear conditions
C. both (a) and (b)
D. less foaming
Show Answer
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Discuss
Correct Answer: both (a) and (b)
10. During the lag phase
Options
A. cells just start growing
B. cells synthesize new proteins and membrane components
C. cells produce antibiotics to kill competing organisms
D. cells simply grow slowly
Show Answer
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Discuss
Correct Answer: cells synthesize new proteins and membrane components
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