Exercise: Agitation And Aeration

Questions for: Agitation And Aeration

Larger propellers turn at the speed of
A:
20 to 150 rpm
B:
150 to 300 rpm
C:
400 to 800 rpm
D:
1150 rpm
Answer: C
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The advantage of axial flow impellers over radial flow impellers is that axial flow impellers
A:
provide better lift of solids
B:
provide high shear conditions
C:
provide low shear conditions
D:
are cheaper to build
Answer: A
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Reynolds (Rei) number for the impeller is given by (where Di, stirrer diameter; N, stirrer speed, Ī, density of fluid and Îŧ, viscosity of fluid)
A:
DiVĪ/Îŧ
B:
Di2NĪ/Îŧ
C:
Di2VĪ/Îŧ
D:
DiNĪ /Îŧ
Answer: B
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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?
A:
The growth rate is limited by the rate of mass transfer of the alkane into the fermentation medium
B:
The growth rate is limited by the intrinsic kinetic properties of the cells and not by mass transfer
C:
The growth rate is neither mass transfer nor kinetically limited
D:
No conclusion on the growth rate can be withdrawn
Answer: D
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If the stirrer speed is too slow, bubbles will accumulate and coalescese under the impeller. This phenomenon is known as a
A:
coalesced impeller
B:
flooded impeller
C:
river impeller
D:
dry impeller
Answer: B
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