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Biochemical Engineering - Agitation and Aeration

Exercise : Agitation and Aeration - Section 1
21.
The reason of using a flat disk in a Turbine is
to create high shear conditions
to break up bubbles more efficiently than the impeller blades
to ensure that the bulk of the energy consumption occurs at the blades
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Which of the following is not considered among the three best-known theories of interphase mass transfer?
two-film theory
penetration theory
surface renewal theory
Calderbank and Moo-Young theory
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Which of the following is most likely to cause an increase in the rate of oxygen transfer into a particular aerated fermentation system?
Addition of antifoams
Increase in temperature
Increase in stirrer speed
Both (a) and (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
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
0.793atml/mmol
0.207atml/mmol
1.26 atml/mmol
8.74 atml/mmol
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Gas hold up, characterizing the hydrodynamics in a fermenter, mainly depends on the
superficial gas velocity
power consumption
Both (a) and (b)
gas concentration
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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