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Biochemical Engineering
‣
Agitation and Aeration
Comments
Question
The average concentration of oxygen in the boundary layers surrounding the bubbles (
C
o
*
) in a reactor is normally determined by
Options
A. ultra-small dissolved oxygen probes
B. laser based photographic systems
C. measuring the steady state concentration of oxygen in the bulk liquid prior to inoculation of the reactor
D. measuring the steady state concentration of oxygen in the bulk liquid after inoculation of the reactor
Correct Answer
measuring the steady state concentration of oxygen in the bulk liquid prior to inoculation of the reactor
Agitation and Aeration problems
Search Results
1. Which of the following impellers will provide radial flow?
Options
A. Paddles
B. Flat blade turbines
C. Disk flat blade turbines
D. All of the above
Show Answer
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Discuss
Correct Answer: All of the above
2. Power number is expressed as
Options
A.
P
0
/
N
2
D
i
3
?
B.
P
0
/
N
3
D
i
5
?
C.
P
0
/
N
3
D
i
3
?
D.
P
0
/
N
2
D
i
2
?
Show Answer
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Discuss
Correct Answer:
P
0
/
N
3
D
i
5
?
3. The oxygen transfer rate in a bioreactor will increase if
Options
A. oil is added
B. antifoam is added
C. detergent like molecules are added
D. increase in the reactor temperature
Show Answer
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Correct Answer: detergent like molecules are added
4. At 25°C, the saturation concentration of oxygen in water is 1.26 mmol/l and the partial pressure of oxygen is 1 atm. The Henry's law constant will be
Options
A. 0.793atml/mmol
B. 0.207atml/mmol
C. 1.26 atml/mmol
D. 8.74 atml/mmol
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Correct Answer: 0.793atml/mmol
5. Which of the following will have the highest surface area available for oxygen transfer?
Options
A. A shake flask
B. A standing test tube
C. A non-sparged stirred tank reactor agitated at 400 rpm
D. A sparged stirred tank reactor agitated at 400 rpm
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Correct Answer: A sparged stirred tank reactor agitated at 400 rpm
6. Which of the following best explains the reasons for using axial flow impellers in crystallization and precipitation reactions?
Options
A. Crystal and precipitates are not too small, so as to ensure easy separation of the solids from the mother liquor
B. Crystals and precipitates are thoroughly broken down, so as to ensure easy separation of the solids from the mother liquor
C. Both (a) and (b)
D. Axial flow impellers provide low shear, energy efficient mixing conditions
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Correct Answer: Crystal and precipitates are not too small, so as to ensure easy separation of the solids from the mother liquor
7. What is the ratio of depth of liquid in vessel to the diameter of tank (
H:D
t
)?
Options
A. 1 : 1
B. 2 : 1
C. 4 : 1
D. none of these
Show Answer
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Correct Answer: 1 : 1
8. Power number is ratio of
Options
A. imposed forced to intertial force
B. bouyant force to inertial force
C. gravitation force to inertial force
D. imposed force to gravitational force
Show Answer
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Correct Answer: imposed forced to intertial force
9. Power consumption by agitation is
Options
A. a function of physical properties
B. a function of operating conditions
C. a function of vessel and impeller geometry
D. all of the above
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Correct Answer: all of the above
10. The reason of using a flat disk in a Turbine is
Options
A. to create high shear conditions
B. to break up bubbles more efficiently than the impeller blades
C. to ensure that the bulk of the energy consumption occurs at the blades
D. all of the above
Show Answer
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Discuss
Correct Answer: to ensure that the bulk of the energy consumption occurs at the blades
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