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Discussion
Home
‣
Biochemical Engineering
‣
Agitation and Aeration
Comments
Question
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
Correct Answer
axial flow impeller
Agitation and Aeration problems
Search Results
1. 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
Scratch Pad
Discuss
Correct Answer: Both (a) and (b)
2. 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
Scratch Pad
Discuss
Correct Answer:
H
= (
Z
f
-
Z
l
)/
Z
f
3. 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
Scratch Pad
Discuss
Correct Answer: discourages bubble coalescence
4. 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
Scratch Pad
Discuss
Correct Answer: Both (b) and (c)
5. 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
Show Answer
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Discuss
Correct Answer: 1/10 to 1/12
6. Which of the following is not considered among the three best-known theories of interphase mass transfer?
Options
A. two-film theory
B. penetration theory
C. surface renewal theory
D. Calderbank and Moo-Young theory
Show Answer
Scratch Pad
Discuss
Correct Answer: Calderbank and Moo-Young theory
7. Henry's law relates
Options
A. the partial pressure of oxygen and the saturation concentration of oxygen in the liquid
B. the oxygen transfer rate and the bubble size
C. the oxygen transfer rate and the temperature
D. the oxygen transfer rate to the partial pressure of oxygen in the liquid
Show Answer
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Discuss
Correct Answer: the partial pressure of oxygen and the saturation concentration of oxygen in the liquid
8. Transient 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: 10<
Re
i
<10
4
9. A flooded impeller will lead to poor oxygen transfer rates because
Options
A. bubbles tend to coalesce under the impeller
B. bubbles tend to break down too rapidly under high shear conditions
C. bubbles tend to move too quickly through the bulk liquid
D. the cells clog up the surface of the bubble
Show Answer
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Discuss
Correct Answer: bubbles tend to coalesce under the impeller
10. Turbine impeller consists of flat impeller blades with
Options
A. a vertical pitch welded directly to the shaft
B. a angled pitch welded directly to the shaft
C. a vertical pitch welded to a horizontal disk
D. a angled pitch welded to a horizontal disk
Show Answer
Scratch Pad
Discuss
Correct Answer: a vertical pitch welded to a horizontal disk
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Agitation and Aeration
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