Discussion
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- Question
The cellular productivity in a continuous stirred tank fermenter (CSTF) increases with an increase in the dilution rate and reaches a maximum value. If the dilution rate is increased beyond the maximum point, the productivity will
Options- A. decrease abruptly
- B. increase
- C. increase drastically
- D. be zero
- Correct Answer
- decrease abruptly
- 1. A chemostat has a liquid volume of 2 litres and is being fed at a rate of 4 litres per hour. Dilution rate for this reactor will be
Options- A. 2 litres
- B. 2 litres per hour
- C. 2 h-1
- D. 4 litres per hour Discuss
- 2. In a fluidized bed reactor, the function of the disengagement zone is to
Options- A. reduce loss of particles from the reactor
- B. reduce the velocity of the particles near the surface of the reactor
- C. reduce foaming problems
- D. all of the above Discuss
- 3. Fed batch reactors is used to produce vinegar because
Options- A. it can maintain low ethanol concentrations
- B. it can maintain low acetic acid concentrations
- C. acetic acid bacteria tend to ferment at high ethanol concentrations
- D. all of the above Discuss
- 4. A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.
Options- A. continuous
- B. batch
- C. fed-batch
- D. semi continuous Discuss
- 5. Which of the following would not be subjected to the "glucose effect"?
Options- A. Aspergillus fumigatus
- B. Saccharomyces cerevisiae
- C. Escherichia coli
- D. Aspergillus niger Discuss
- 6. Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is
Options- A. time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
- B. total amount in rector = rate of addition to reactor - rate of removal + rate of formation
- C. rate of total amount in rector = rate of addition to reactor - rate of removal + rate of formation
- D. none of the above Discuss
- 7. In batch culture, protogon is produced from peptone during the stationary phase with a yield of 0.4 protogon mg per g of peptone. If it is to be produced in a chemostat at a dilution rate of 0.5 h-1 from a medium containing 10 g.l-1 of peptone, then the rate of protogon synthesis would be
Options- A. 0 g.l-1h-1
- B. 0.5 g.l-1h-1
- C. 1 g.l-1h-1
- D. 2 g.l-1h-1 Discuss
- 8. 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
- 9. The main reason for production of antibiotics in fed batch reactors is
Options- A. the presence of precursors is often toxic to the cells
- B. higher yields when cells enter the stationary phase
- C. higher yields when cell growth slows
- D. all of the above Discuss
- 10. When a culture of fermenting yeast becomes metabolically uncoupled, ethanol
Options- A. becomes a secondary metabolite
- B. production becomes growth associated
- C. production becomes non-growth associated
- D. becomes a growth nutrient Discuss
Fermentation Reactors problems
Search Results
Correct Answer: 2 h-1
Correct Answer: all of the above
Correct Answer: it can maintain low ethanol concentrations
Correct Answer: continuous
Correct Answer: Escherichia coli
Correct Answer: time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
Correct Answer: 0 g.l-1h-1
Correct Answer: an aerated batch culture containing a initial high concentration of glucose
Correct Answer: all of the above
Correct Answer: production becomes non-growth associated
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