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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. The viscosity of water at STP is approximately
Options- A. 0.005 kg.m-1.s-1
- B. 0.001 kg.m-1.s-1
- C. 0.003 kg.m-2.s-1
- D. 0.1 g.cm-1.s-1 Discuss
- 2. The collection efficiency by diffusion increases with
Options- A. decreasing particle size
- B. decreasing air velocity
- C. both (a) and (b)
- D. increasing particle size Discuss
- 3. Which of the following activity is possible by transferases?
Options- A. Transfer of methyl groups
- B. Transfer of glycosyl group
- C. Both (a) and (b)
- D. None of these Discuss
- 4. Bacterial growth curve is obtained by plotting
Options- A. number of cells versus time
- B. number fo spores versus time
- C. log of number of cells versus time
- D. log of number of cells survived versus time Discuss
- 5. The fastest route of NADH reoxidation is
Options- A. aerobic respiration
- B. anaerobic respiration
- C. fermentation
- D. decomposition Discuss
- 6. The contents in jet loop reactor are mixed through
Options- A. compressed air
- B. a mechanical agitator
- C. external pumping
- D. any of these Discuss
- 7. The number of baffles in a standard stirred tank bioreactor is
Options- A. 8
- B. 6
- C. 4
- D. 2 Discuss
- 8. Which of the following chemical is sometime added in the process of coagulation and flocculation?
Options- A. Aluminum sulphate
- B. Aluminum oxide
- C. Calcium chloride
- D. None of these Discuss
- 9. The high oxygen transfer efficiencies of airlift bioreactors is due to
Options- A. the large aspect ratio of the reactor, which leads to a high gas hold-up
- B. the large aspect ratio of the reactor, which leads to a high oxygen solubility at the base of the reactor
- C. the draft tube, which reduces bubble coalescence in the reactor
- D. all of the above Discuss
- 10. The region of an airlift bioreactor in which the liquid travels in a downward direction is called the
Options- A. downcomer
- B. disengagement zone
- C. air riser
- D. flotsam Discuss
More questions
Correct Answer: 0.001 kg.m-1.s-1
Correct Answer: both (a) and (b)
Correct Answer: Both (a) and (b)
Correct Answer: log of number of cells versus time
Correct Answer: fermentation
Correct Answer: external pumping
Correct Answer: 4
Correct Answer: Aluminum sulphate
Correct Answer: all of the above
Correct Answer: downcomer
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