Exercise: Fermentation Reactors

Questions for: Fermentation Reactors

Low dissolved oxygen concentrations leads to
A:
low biomass yields
B:
high biomass yields
C:
no effect on biomass yields
D:
none of the above
Answer: A
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If biomass yields are constant, then the biomass productivity of a culture grown in continuous reactor will
A:
always decrease with dilution rate
B:
increase with dilution rate until washout
C:
remain constant irrespective of the dilution rate
D:
decrease with dilution rate until washout
Answer: B
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Which of the following is used to calculate mass of substrate in the reactor?
A:
Flow rate x substrate concentration in the reactor
B:
Volume of reactor x substrate concentration in reactor
C:
Flow rate x mass of reactor
D:
Volume of reactor x Flow rate
Answer: B
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A continuous reactor has a dilution rate of 0.5 h-1. Its residence time would be
A:
ln(2)/0.5
B:
ln(2) x 0.5
C:
0.5 h
D:
2 h
Answer: D
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In aerobic yeast fermentation for production of citric acid from alkanes using a fed-batch culture, why alkanes are slowly fed to the yeast?
A:
Citric acid is toxic to the cells
B:
Alkanes cause foaming
C:
Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
D:
Fast addition of alkanes will cause the cells to grow too quickly
Answer: C
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