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Biochemical Engineering
‣
Fermentation Kinetics
See What Others Are Saying!
Question
The function of the disengagement zone in an airlift fermenter is to
Options
A. prevent CO
2
rich bubbles from entering the downcomer
B. reduce the velocity of the bubbles
C. reduce liquid loss as aerosols
D. all of the above
Correct Answer
all of the above
More questions
1. The number of baffles in a standard stirred tank bioreactor is
Options
A. 8
B. 6
C. 4
D. 2
Show Answer
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Discuss
Correct Answer: 4
2. Which of the following chemical is sometime added in the process of coagulation and flocculation?
Options
A. Aluminum sulphate
B. Aluminum oxide
C. Calcium chloride
D. None of these
Show Answer
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Discuss
Correct Answer: Aluminum sulphate
3. The high oxygen transfer efficiencies of airlift bioreactors is due to
Options
A. the large aspect ratio of the reactor, which leads to a high gas hold-up
B. the large aspect ratio of the reactor, which leads to a high oxygen solubility at the base of the reactor
C. the draft tube, which reduces bubble coalescence in the reactor
D. all of the above
Show Answer
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Discuss
Correct Answer: all of the above
4. The region of an airlift bioreactor in which the liquid travels in a downward direction is called the
Options
A. downcomer
B. disengagement zone
C. air riser
D. flotsam
Show Answer
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Discuss
Correct Answer: downcomer
5. Laminar flow range of mixing speed is obtained for
Options
A.
Re
i
<10
B. 10<
Re
i
<10
4
C.
Re
i
>10
4
D. None of these
Show Answer
Scratch Pad
Discuss
Correct Answer:
Re
i
<10
6. A liquid is flowing at 11,400 l.h
-1
along a pipeline having a diameter of 4 cm. If the liquid has a density of 1 g.ml
-1
and viscosity of 0.001kg.m
-1
.s
-1
, then the liquid would be in the
Options
A. laminar phase
B. transient phase
C. turbulent phase
D. any of the phase
Show Answer
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Discuss
Correct Answer: turbulent phase
7. Pluronic F68 protects mammalian cells from damage stems as it is a/an
Options
A. surface active agent which stabilizes foams
B. surface active agent which destabilizes foams
C. excellent source of vitamins
D. coagulant
Show Answer
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Correct Answer: surface active agent which stabilizes foams
8. An aerated bioreactor will increase oxygen transfer rates with the addition of detergents because it
Options
A. enhances bubble coalescence
B. causes bubbles to expand
C. discourages bubble coalescence
D. increases the surface tension of the liquid
Show Answer
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Correct Answer: discourages bubble coalescence
9. When substrate [S] = K
M
(Michaelis-Menten constant), the velocity of an enzyme catalyzed reaction is about
Options
A. 0.1 * V
max
B. 0.2 * V
max
C. 0.5 * V
max
D. 0.9 * V
max
Show Answer
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Discuss
Correct Answer: 0.5 * V
max
10. Commonly employed water insoluble supports for the covalent attachment of enzyme include
Options
A. acrylamide based polymers
B. polypeptides
C. dextran
D. all of these
Show Answer
Scratch Pad
Discuss
Correct Answer: all of these
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More in Biochemical Engineering:
Agitation and Aeration
Downstream Processing
Enzymes and Application
Enzymes and Kinetics
Fermentation Kinetics
Fermentation Reactors
Fluid Flow
Immobilized Enzyme
Sterilization
Water Treatment