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- Question
In the batch-fed mode, substrate will be added
Options- A. only at the beginning of the fermentation process
- B. periodically throughout the fermentation process
- C. only at the end of the fermentation process
- D. substrate is never added
- Correct Answer
- only at the end of the fermentation process
- 1. Which of the following organisms will continue their metabolism at high substrate concentrations?
Options- A. Pseudomonas aeruginosa
- B. Saccharomyces cerevisiae
- C. Bacillus subtilis
- D. Escherichia coli Discuss
- 2. Pseudomonas aeruginosa has a maximum specific growth rate of 0.8 h-1 in a medium with glucose as a growth limiting substrate. To prevent wash out, the dilution rate must be set to
Options- A. greater than 0.8 h-1
- B. less than 0.8 h-1
- C. equal to 0.8 h-1
- D. 1.6 h-1 Discuss
- 3. When Escherichia coli grow in a well aerated medium, which of the following will occur?
Options- A. Fructose di-phosphate accumulation inside the cells leading to cell respiration
- B. Fructose di-phosphate accumulation inside the cells leading to fermentation
- C. Fructose di-phosphate will accumulate regardless of the medium composition
- D. Fructose di-phosphate will accumulate inside the cells leading to anaerobic respiration Discuss
- 4. The ideal tubular-flow fermenter without radial variations is called a
Options- A. plug flow fermenter
- B. continuous stirred tank fermenter (CSTF)
- C. column fermenter
- D. any intensity of dilution rate near the wash out points Discuss
- 5. In plug flow tubular reactor the axial velocity profile on cross-section will be
Options- A. constant
- B. varying with time
- C. non-linear
- D. power function of time Discuss
- 6. Pseudo-steady state in a continuous reactor refers to a reactor in which
Options- A. Pseudomonads are being cultured
- B. concentration oscillate around a mean value
- C. concentration increase with time
- D. concentration decrease with time Discuss
- 7. In a plug flow reactor, the highest concentration of substrates is exposed to the cells that
Options- A. are near the effluent or exit of the reactor
- B. are in the mid way along the reactor
- C. are located near entrance of feed
- D. are near the wall of the reactor Discuss
- 8. In fed batch bioreactor modelling, the rate of change in the bioreactor volume is assumed to be equal to
Options- A. flow rate
- B. initial volume
- C. volume of solids in the reactor
- D. none of these Discuss
- 9. Which of the following is not correct with regards to continuous cultures?
Options- A. The major industrial scale application of continuous cultures is in waste water treatment
- B. Mutation and contamination present a major risk to the operation of continuous cultures for the production of metabolites
- C. The continuous cultures is very useful for the production of pharmaceuticals
- D. Continuous cultures have an advantage that they do not need to shut down as regularly as batch culture reactor Discuss
- 10. Two continuous bioreactors containing the same organisms, fed with the same feed at the same dilution rate were compared. Reactor 1 started with an initial concentration of glucose of 10 g.l-1, while reactor 2 contained 0.1 g.l-1 of glucose at the start of the process then at steady state
Options- A. the concentration of glucose in reactor 1 would be greater than that in reactor 2
- B. the concentration of glucose in reactor 1 would be equal to reactor 2
- C. the concentration of glucose in reactor 1 would always be zero.
- D. the concentration of glucose in reactor 1 would be less than that in reactor 2 Discuss
Fermentation Reactors problems
Search Results
Correct Answer: Pseudomonas aeruginosa
Correct Answer: less than 0.8 h-1
Correct Answer: Fructose di-phosphate accumulation inside the cells leading to fermentation
Correct Answer: plug flow fermenter
Correct Answer: constant
Correct Answer: concentration oscillate around a mean value
Correct Answer: are located near entrance of feed
Correct Answer: flow rate
Correct Answer: The continuous cultures is very useful for the production of pharmaceuticals
Correct Answer: the concentration of glucose in reactor 1 would be equal to reactor 2
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