Discussion
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- Question
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
- Correct Answer
- distribute shear forces throughout the reactor and minimise bubble coalescence
- 1. Tower fermentors are used for
Options- A. continuous penicillin production
- B. continuous beer production
- C. production of enzymes
- D. batch production of beer Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. If the specific growth rate, ?. is constant with time during the exponential growth period, the equation correlating bacterial number density Cn), cell number concentration with respect to time can be expressed as
Options- A. Cn= Cn0 exp[? (t - t0)]
- B. Cn0 = Cn exp[? (t - t0)]
- C. Cn/Cn0 =(1/?)exp(t-t0)
- D. Cn0 / Cn = (1/?)exp(t-t0) Discuss
- 6. The bubble column fermenter is usually limited to
Options- A. aerobic fermentations
- B. anaerobic fermentations
- C. Both (a) and (b)
- D. facultative fermentation Discuss
- 7. The specific growth rate is affected by
Options- A. sabstrate concentration
- B. product concentration
- C. oxygen supply
- D. all of these Discuss
- 8. 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
- 9. 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
- 10. 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
Fermentation Kinetics problems
Search Results
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: Cn= Cn0 exp[? (t - t0)]
Correct Answer: aerobic fermentations
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
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