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Home ‣ Biochemical Engineering ‣ Fermentation Kinetics Comments
- Question
The contents in bubble column and air lift reactor are mixed through
Options- A. compressed air
- B. a mechanical internal moving part
- C. external pumping
- D. any of these
- Correct Answer
- compressed air
- 1. To describe components of an airlift bioreactor which of the follow-ings are generally included?
Options- A. Disengagement zone, air riser, downcomer
- B. Flotsam, jetsam, downzone
- C. Air comer, disentanglement zone, downsizer
- D. All of the above Discuss
- 2. The contents in stirred tank rector are mixed through
Options- A. compressed air
- B. a mechanical agitator
- C. external pumping
- D. any of these Discuss
- 3. During the lag phase
Options- A. cells just start growing
- B. cells synthesize new proteins and membrane components
- C. cells produce antibiotics to kill competing organisms
- D. cells simply grow slowly Discuss
- 4. The advantage of airlift bioreactors over stirred tank bioreactors of a similar size is
Options- A. higher oxygen transfer rates
- B. more uniform shear conditions
- C. both (a) and (b)
- D. less foaming Discuss
- 5. The diameter of the baffles in a standard stirred tank bioreactor ranges from
Options- A. 1/10th - 1/12th of the tank diameter
- B. 1/3rd - 1/4th of the tank diameter
- C. 1/15th - 1/20th of the tank diameter
- D. 1/20th - 1/25th of the tank diameter Discuss
- 6. A functional relationship between the specific growth rate and essential compounds concentration was proposed by Monod in
Options- A. 1958
- B. 1946
- C. 1942
- D. 1950 Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Fermentation Kinetics problems
Search Results
Correct Answer: Disengagement zone, air riser, downcomer
Correct Answer: a mechanical agitator
Correct Answer: cells synthesize new proteins and membrane components
Correct Answer: both (a) and (b)
Correct Answer: 1/10th - 1/12th of the tank diameter
Correct Answer: 1942
Correct Answer: Cn= Cn0 exp[? (t - t0)]
Correct Answer: it is easier to clean and sterilize a reactor
Correct Answer: STF can't be used for high viscosity medium
Correct Answer: high dilution rates near the washout point
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