Exercise: Fermentation Reactors

Questions for: Fermentation Reactors

Pseudo-steady state in a continuous reactor refers to a reactor in which
A:
Pseudomonads are being cultured
B:
concentration oscillate around a mean value
C:
concentration increase with time
D:
concentration decrease with time
Answer: B
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The ideal tubular-flow fermenter without radial variations is called a
A:
plug flow fermenter
B:
continuous stirred tank fermenter (CSTF)
C:
column fermenter
D:
any intensity of dilution rate near the wash out points
Answer: A
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The concentration of biomass in a continuous stirred tank reactor is 20 g dry weight per litre. What would be the concentration of biomass in the effluent?
A:
Greater than 20 g dry weight per litre
B:
Approximately 20 g dry weight per litre
C:
Lesser than 20 g dry weight per litre
D:
More than 30 g dry weight per litre
Answer: B
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Production of organic acids in batch culture is generally growth associated phase followed by non-growth associated production. The probable reason for this is that
A:
organic acids uncouple catabolism from anabolism
B:
biomass yields increase as the fermentation proceeds
C:
organic acids are secondary metabolites
D:
high concentrations of organic acid promote the growth of the microbial population
Answer: A
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In plug flow tubular reactor the axial velocity profile on cross-section will be
A:
constant
B:
varying with time
C:
non-linear
D:
power function of time
Answer: A
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