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Home ‣ Biochemical Engineering ‣ Fermentation Reactors See What Others Are Saying!
- Question
The fastest route of NADH reoxidation is
Options- A. aerobic respiration
- B. anaerobic respiration
- C. fermentation
- D. decomposition
- Correct Answer
- fermentation
- 1. Concentration polarization can be reduced further by
Options- A. pre filtering the solution
- B. reducing the flow rate per unit membrane surface area
- C. back washing periodically
- D. all of the above Discuss
- 2. The lowest biomass yield in a culture of Escherichia coli will be in
Options- A. an aerated batch culture containing a initial high concentration of glucose
- B. an aerated batch reactor containing an initial low concentration of glucose
- C. an aerated fed-batch reactor having a low glucose concentration
- D. an aerated continuous reactor having a low glucose concentration Discuss
- 3. Selectivity can be expressed as
Options- A. ratio of the distribution coefficients in different solute
- B. mass fraction of the solute in the extract phase at equilibrium
- C. mass fraction of the solute in the raffinate phase
- D. ratio of the mass fraction of the solute in the extract phase to the raffinate phase Discuss
- 4. During the enzymatic reaction of an immobilized enzyme, the rate of substrate transfer is
Options- A. equal to that of substrate consumption
- B. more than that of substrate consumption
- C. lesser than that of substrate consumption
- D. is nothing to do with the substrate consumption Discuss
- 5. A microorganism which is subjected to the Crabtree effect is most likely to
Options- A. ferment in the presence of low concentrations of sugar and dissolved oxygen
- B. respire in the presence of low sugar and high dissolved oxygen concentrations
- C. ferment in the presence of high concentrations of sugar and dissolved oxygen
- D. respire in the presence of high sugar and low dissolved oxygen concentrations Discuss
- 6. If Damkohler number, NDa >>1, the reaction rate is much greater than the mass transfer rate and the overall reaction is controlled by the rate of mass transfer. In this case, the enzyme reaction can be described as (where Csb and Cs are the substrate concentration in bulk of solution and at the immobilized enzyme surface respectively. ks mass transfer coefficient, and a is the surface area of an immobilized enzyme particles)
Options- A. rp = ksa(Csb-Cs)
- B. rp = ksaCsb
- C. rp = ksaCs
- D. rp = ksa(Csb+Cs) Discuss
- 7. Which have the maximum resistance while transferring carbon dioxide from the bulk liquid to an air bubble?
Options- A. Moving through the gas liquid interface
- B. Moving through the bubble boundary layer
- C. Moving across the cell membrane
- D. Moving through the bulk liquid Discuss
- 8. Which of the following will have the highest surface area available for oxygen transfer?
Options- A. A shake flask
- B. A standing test tube
- C. A non-sparged stirred tank reactor agitated at 400 rpm
- D. A sparged stirred tank reactor agitated at 400 rpm Discuss
- 9. Mixing in an anaerobic sludge blanket reactor is due to
Options- A. rapid change in water temperatures throughout the reactor
- B. release of gases by the microbial populations
- C. swimming of microbes
- D. none of the above Discuss
- 10. Permanent hardness of water is caused by the presence of
Options- A. bicarbonates of calcium and magnesium
- B. carbonates of sodium and potassium
- C. chlorides and sulfates of calcium and magnesium
- D. phosphates of sodium and potassium Discuss
More questions
Correct Answer: all of the above
Correct Answer: an aerated batch culture containing a initial high concentration of glucose
Correct Answer: ratio of the distribution coefficients in different solute
Correct Answer: equal to that of substrate consumption
Correct Answer: ferment in the presence of high concentrations of sugar and dissolved oxygen
Correct Answer: rp = ksaCsb
Correct Answer: Moving through the bubble boundary layer
Correct Answer: A sparged stirred tank reactor agitated at 400 rpm
Correct Answer: release of gases by the microbial populations
Correct Answer: chlorides and sulfates of calcium and magnesium
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