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Biochemical Engineering
‣
Agitation and Aeration
Comments
Question
The range of width for the baffle in the fermenter is __________ times of vessel diameter
Options
A. 1/10 to 1/12
B. 1/8 to 1/10
C. 1/5 to 1/8
D. none of these
Correct Answer
1/10 to 1/12
Agitation and Aeration problems
Search Results
1. Why vortexing is undesirable in the agitation of biological systems?
Options
A. The collision between the cells, impeller and air bubbles will lead to cell damage
B. Poor mixing despite the use of high stirrer speeds
C. Mixing will not be in the turbulent region
D. All of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: All of the above
2. 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
3. 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
Show Answer
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Discuss
Correct Answer: all of the above
4. 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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Discuss
Correct Answer: imposed forced to intertial force
5. 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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Discuss
Correct Answer: 1 : 1
6. Which of the following(s) is/are non-mechanically agitated reactors?
Options
A. Stirrer tank reactor
B. Bubble column
C. Air lift reactor
D. Both (b) and (c)
Show Answer
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Discuss
Correct Answer: Both (b) and (c)
7. 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
8. The average fractional gas hold up (H) can be given as (where
Z
f
and
Z
l
are the level of aerated and clear liquid respectively)
Options
A.
H
= (
Z
f
-
Z
l
)/
Z
f
B.
H
=
Z
f
/
Z
l
C.
H
=
Z
f
/
Z
f
Z
l
D.
H
=(
Z
f
+
Z
l
)/
Z
f
Show Answer
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Discuss
Correct Answer:
H
= (
Z
f
-
Z
l
)/
Z
f
9. Vortexing in stirred tank reactors can be prevented by
Options
A. installing baffles in the reactor
B. shifting the impeller to an off-centre position
C. Both (a) and (b)
D. using axial flow impellers
Show Answer
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Discuss
Correct Answer: Both (a) and (b)
10. A typical ceiling fan would be best described as a(n)
Options
A. radial flow impeller
B. axial flow impeller
C. intermig impeller
D. Rushton turbine
Show Answer
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Discuss
Correct Answer: axial flow impeller
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Agitation and Aeration
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