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Home ‣ Biochemical Engineering ‣ Fermentation Reactors See What Others Are Saying!
- Question
A Bacillus sp. produces an antibiotic only during the stationary phase when grown in a batch culture. If grown in a 5 litre continuous culture, the steady state productivity of the antibiotic
Options- A. will increase until the culture washes out
- B. will decrease after washout
- C. will be zero
- D. will be infinite
- Correct Answer
- will be zero
- 1. The SI unit for viscosity is
Options- A. kg.m-1.s-1
- B. kg.m-2.s-2
- C. kg.m-3.s-1
- D. kg.m-1.s-2 Discuss
- 2. The support material for immobilization of cells of Bacillus subtilis is
Options- A. ion exchange resins
- B. gelatin
- C. Anthracite
- D. agarose and carbodiimide Discuss
- 3. If biomass yields are constant, then the biomass productivity of a culture grown in continuous reactor will
Options- A. always decrease with dilution rate
- B. increase with dilution rate until washout
- C. remain constant irrespective of the dilution rate
- D. decrease with dilution rate until washout Discuss
- 4. Pluronic F68 is added to cell culture media as
Options- A. a nutrient
- B. a shear protectorant
- C. to increase oxygen transfer rates
- D. all of these Discuss
- 5. The increased air flow rate in bubble column fermenter can cause excessive foaming and high retention of air bubbles in the column which
Options- A. decreases the productivity of the fermenter
- B. increases the productivity of the fermenter
- C. modestly increases the productivity of the fermenter
- D. does not affect on the productivity Discuss
- 6. 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 Discuss
- 7. Sanitizers used for rubber made equipments are
Options- A. strong acids
- B. strong alkalis
- C. combination of both
- D. none of these Discuss
- 8. 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
- 9. 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
- 10. 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
More questions
Correct Answer: kg.m-1.s-1
Correct Answer: agarose and carbodiimide
Correct Answer: increase with dilution rate until washout
Correct Answer: a shear protectorant
Correct Answer: decreases the productivity of the fermenter
Correct Answer: decrease abruptly
Correct Answer: strong alkalis
Correct Answer: 0.001 kg.m-1.s-1
Correct Answer: both (a) and (b)
Correct Answer: Both (a) and (b)
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