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Biochemical Engineering - Agitation and Aeration

Exercise : Agitation and Aeration - Section 2
26.
During fermentation, the saturation concentration of oxygen was reduced from 7 ppm. to 1 ppm. Which one of the following conclusions can be drawn?
Microbial growth is oxygen limited since the oxygen concentration is lesser than the saturation concentration
Microbial growth is not oxygen limited since the oxygen concentration is lesser than the saturation concentration
Experimental error leads to the reduction
No conclusion can be drawn
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
If the stirrer speed is too slow, bubbles will accumulate and coalescese under the impeller. This phenomenon is known as a
coalesced impeller
flooded impeller
river impeller
dry impeller
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
The maximum solubility of the alkane in the medium is 5 ppm. If the actual dissolved concentration of the alkane in the medium is 1 ppm. what conclusion may be drawn?
The growth rate is limited by the rate of mass transfer of the alkane into the fermentation medium
The growth rate is limited by the intrinsic kinetic properties of the cells and not by mass transfer
The growth rate is neither mass transfer nor kinetically limited
No conclusion on the growth rate can be withdrawn
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
Reynolds (Rei) number for the impeller is given by (where Di, stirrer diameter; N, stirrer speed, ρ, density of fluid and μ, viscosity of fluid)
DiVρ/μ
Di2Nρ/μ
Di2Vρ/μ
DiNρ /μ
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
The advantage of axial flow impellers over radial flow impellers is that axial flow impellers
provide better lift of solids
provide high shear conditions
provide low shear conditions
are cheaper to build
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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