Fermentation Kinetics problems
- 1. The increased air flow rate in bubble column fermenter can cause excessive foaming and high retention of air bubbles in the column which
Options- A. decreases the productivity of the fermenter
- B. increases the productivity of the fermenter
- C. modestly increases the productivity of the fermenter
- D. does not affect on the productivity Discuss
Correct Answer: decreases the productivity of the fermenter
- 2. The maximum specific growth rate of an organism depends on
Options- A. medium composition
- B. temperature
- C. pH
- D. All of these Discuss
Correct Answer: All of these
- 3. A higher Ks 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 Discuss
Correct Answer: greater affinities to substrate
- 4. 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 Discuss
Correct Answer: all of the above
- 5. 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 Discuss
Correct Answer: no further increase in the cell population after a maximum value
- 6. 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 Discuss
Correct Answer: Both (a) and (b)
- 7. 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 Discuss
Correct Answer: Continuous packed bed reactor
- 8. The number of baffles in a standard stirred tank bioreactor is
Options- A. 8
- B. 6
- C. 4
- D. 2 Discuss
Correct Answer: 4
- 9. 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 Discuss
Correct Answer: log of number of cells versus time
- 10. The contents in jet loop reactor are mixed through
Options- A. compressed air
- B. a mechanical agitator
- C. external pumping
- D. any of these Discuss
Correct Answer: external pumping
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