Fermentation Kinetics problems
- 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
Correct Answer: Disengagement zone, air riser, downcomer
- 2. 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 Discuss
Correct Answer: compressed air
- 3. 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
Correct Answer: 1942
- 4. 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
Correct Answer: Cn= Cn0 exp[? (t - t0)]
- 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
Correct Answer: it is easier to clean and sterilize a reactor
- 6. 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
Correct Answer: STF can't be used for high viscosity medium
- 7. 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
Correct Answer: high dilution rates near the washout point
- 8. Tower fermentors are used for
Options- A. continuous penicillin production
- B. continuous beer production
- C. production of enzymes
- D. batch production of beer Discuss
Correct Answer: continuous beer production
- 9. 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
Correct Answer: distribute shear forces throughout the reactor and minimise bubble coalescence
- 10. The bubble column fermenter is usually limited to
Options- A. aerobic fermentations
- B. anaerobic fermentations
- C. Both (a) and (b)
- D. facultative fermentation Discuss
Correct Answer: aerobic fermentations
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