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Home
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Biochemical Engineering
‣
Agitation and Aeration
Comments
Question
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
Correct Answer
Calderbank and Moo-Young theory
Agitation and Aeration problems
Search Results
1. 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
Scratch Pad
Discuss
Correct Answer: axial flow impeller
2. 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)
3. 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
4. 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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Discuss
Correct Answer: discourages bubble coalescence
5. 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)
6. 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
7. 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
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Discuss
Correct Answer: 10<
Re
i
<10
4
8. 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
9. 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
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Discuss
Correct Answer: a vertical pitch welded to a horizontal disk
10. The power consumption in a stirring vessel can be assessed by using a
Options
A. dynamometer
B. strain gauge attached to agitator shaft
C. watt meter attached to agitator motor
D. all of these
Show Answer
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Discuss
Correct Answer: all of these
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