Exercise: Agitation And Aeration

Questions for: Agitation And Aeration

During fermentation, the saturation concentration of oxygen was reduced from 7 ppm. to 1 ppm. Which one of the following conclusions can be drawn?
A:
Microbial growth is oxygen limited since the oxygen concentration is lesser than the saturation concentration
B:
Microbial growth is not oxygen limited since the oxygen concentration is lesser than the saturation concentration
C:
Experimental error leads to the reduction
D:
No conclusion can be drawn
Answer: D
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The addition of antifoams to an aerated bioreactor will decrease oxygen transfer rates because antifoams
A:
increase the tendency of bubbles to coalesce
B:
tend to accumulate in the gas liquid interface
C:
reduce the surface tension of the liquid
D:
All of the above answers
Answer: D
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The dynamic technique is based on the
A:
oxygen material balance in an aerated batch fermenter during the growth of microorganisms
B:
change of the oxygen concentration
C:
oxidation of the sodium sulfite to sodium sulfate
D:
oxygen material balance in a fermenter
Answer: A
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Industrial paddle agitators turn at the speed of
A:
20 and 150 rpm
B:
150 and 300 rpm
C:
400 and 800 rpm
D:
1150 rpm
Answer: A
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The oxygen absorption rate can be determined by
A:
sodium sulfite oxidation method
B:
dynamic gassing out technique
C:
direct measurement
D:
all of these
Answer: D
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