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Biochemical Engineering
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Fermentation Kinetics
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Question
Heat transfer rates (per unit volume) will be lowest in
Options
A. Stirred tank bioreactor with biomass recycle
B. Continuous air lift bioreactor
C. Continuous packed bed reactor
D. Continuous fluidized bed bioreactor
Correct Answer
Continuous packed bed reactor
Fermentation Kinetics problems
Search Results
1. Which of the following is correct for the prediction of time requirement in a batch fermenter?
Options
A. Carrying out experiments
B. Mathematical modelling of the fermentation process
C. Both (a) and (b)
D. It is impossible to predict the time required for fermentation
Show Answer
Scratch Pad
Discuss
Correct Answer: Both (a) and (b)
2. Stationary phase is described as
Options
A. no further increase in the cell population after a maximum value
B. deceleration of growth and division rate after the growth rate reaches a maximum
C. acceleration of growth and division rate after the growth rate reaches a maximum
D. deceleration of growth and division rate after the growth rate reaches a minimum
Show Answer
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Discuss
Correct Answer: no further increase in the cell population after a maximum value
3. The high oxygen transfer efficiencies of airlift bioreactors is due to
Options
A. the large aspect ratio of the reactor, which leads to a high gas hold-up
B. the large aspect ratio of the reactor, which leads to a high oxygen solubility at the base of the reactor
C. the draft tube, which reduces bubble coalescence in the reactor
D. all of the above
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Discuss
Correct Answer: all of the above
4. A higher
K
s
value of Monod's equation means
Options
A. greater affinities to substrate
B. lower affinities to substrate
C. unaffected with the substrate bonding
D. lower dissociation constant value
Show Answer
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Discuss
Correct Answer: greater affinities to substrate
5. The maximum specific growth rate of an organism depends on
Options
A. medium composition
B. temperature
C. pH
D. All of these
Show Answer
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Discuss
Correct Answer: All of these
6. The number of baffles in a standard stirred tank bioreactor is
Options
A. 8
B. 6
C. 4
D. 2
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Discuss
Correct Answer: 4
7. Bacterial growth curve is obtained by plotting
Options
A. number of cells versus time
B. number fo spores versus time
C. log of number of cells versus time
D. log of number of cells survived versus time
Show Answer
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Correct Answer: log of number of cells versus time
8. The contents in jet loop reactor are mixed through
Options
A. compressed air
B. a mechanical agitator
C. external pumping
D. any of these
Show Answer
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Discuss
Correct Answer: external pumping
9. Why a T-flask used in small-scale cell culture is incubated in a horizontal position?
Options
A. To save space
B. To increase the surface area of the liquid-air interface
C. Both (a) and (b)
D. To increase the rate of oxygen transfer into the liquid
Show Answer
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Discuss
Correct Answer: Both (a) and (b)
10. Wash out in steady state fermentation occurs when
Options
A. dilution rate is less than maximum specific growth rate
B. dilution rate is higher than the maximum specific growth rate
C. cell concentration reaches the maximum
D. specific growth rate is maximum
Show Answer
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Discuss
Correct Answer: dilution rate is higher than the maximum specific growth rate
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