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- Question
The bubble column fermenter is usually limited to
Options- A. aerobic fermentations
- B. anaerobic fermentations
- C. Both (a) and (b)
- D. facultative fermentation
- Correct Answer
- aerobic fermentations
- 1. The main function(s) of a draft tube in an air lift fermenter is/are to
Options- A. increase the solubility of oxygen
- B. distribute shear forces throughout the reactor and minimise bubble coalescence
- C. concentrate shear forces around the sparger
- D. concentrate shear forces near the disengagement zone Discuss
- 2. Tower fermentors are used for
Options- A. continuous penicillin production
- B. continuous beer production
- C. production of enzymes
- D. batch production of beer Discuss
- 3. Turbidostat is recommended when continuous fermentation needs to be carried out at
Options- A. high dilution rates near the washout point
- B. low dilution rates near the washout point
- C. moderate dilution rates near the washout point
- D. any intensity of dilution rates near the washout point Discuss
- 4. Which of the following is incorrect?
Options- A. The mechanical agitation and aeration are effective for suspension of cells
- B. The mechanical agitation and aeration are effective for mixing the medium
- C. STF can't be used for high viscosity medium
- D. The mechanical agitation and aeration are effective for oxygenation Discuss
- 5. An internal draft tube is preferrred to an external draft tube because
Options- A. it is easier to clean and sterilize a reactor
- B. it is cheaper to build a reactor with an internal draft tube
- C. Both (a) and (b)
- D. none of the above Discuss
- 6. The specific growth rate is affected by
Options- A. sabstrate concentration
- B. product concentration
- C. oxygen supply
- D. all of these Discuss
- 7. In a batch reactor specific growth rate
Options- A. remains constant throughout the process
- B. increases exponentially
- C. changes during the fermentation
- D. is highest during the stationary phase Discuss
- 8. The production of an amylase from starch by Aspergillus niger is often performed in a fed batch fermenter. This is due to the reason that
Options- A. fed-batch reactor can be used to minimize starch concentrations and prevent a. niger from fermenting
- B. fed-batch reactor can be used to minimize starch concentrations and thus reduce the viscosity of the medium
- C. continuous reactor can be used to minimize starch concentrations and their inhibitory effects
- D. all of the above Discuss
- 9. Saccharomyces cerevisiae when grown in high glucose concentration medium, the cells activity depends on which of the following?
Options- A. High concentration of dissolved oxygen
- B. Low concentration of dissolved oxygen
- C. No effect of dissolved oxygen
- D. High concentration of dissolved oxygen and sodium salts Discuss
- 10. In a fluidized bed reactor mixing is achieved by
Options- A. gravity flow of fluid
- B. upward movement of the incoming feed
- C. diffusion
- D. both (a) and (b) Discuss
Fermentation Kinetics problems
Search Results
Correct Answer: distribute shear forces throughout the reactor and minimise bubble coalescence
Correct Answer: continuous beer production
Correct Answer: high dilution rates near the washout point
Correct Answer: STF can't be used for high viscosity medium
Correct Answer: it is easier to clean and sterilize a reactor
Correct Answer: all of these
Correct Answer: changes during the fermentation
Correct Answer: fed-batch reactor can be used to minimize starch concentrations and thus reduce the viscosity of the medium
Correct Answer: No effect of dissolved oxygen
Correct Answer: both (a) and (b)
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