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‣
Biochemical Engineering
‣
Agitation and Aeration
Comments
Question
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
Correct Answer
10<
Re
i
<10
4
Agitation and Aeration problems
Search Results
1. 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
2. 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
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Discuss
Correct Answer: Calderbank and Moo-Young theory
3. 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
4. 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)
5. 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
6. 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
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Correct Answer: bubbles tend to coalesce under the impeller
7. 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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Correct Answer: a vertical pitch welded to a horizontal disk
8. 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
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Correct Answer: all of these
9. The rate limiting step in the movement of oxygen from the gas phase in a bubble to the cell is the movement of oxygen molecules through
Options
A. gas-liquid interface
B. bubble boundary layer
C. bulk liquid
D. gas phase
Show Answer
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Correct Answer: bubble boundary layer
10. Swirling and vortex formation can be prevented by
Options
A. using baffles
B. using diffusion ring with turbines
C. both (a) and (b)
D. none of these
Show Answer
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Discuss
Correct Answer: both (a) and (b)
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