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Home ‣ Biochemical Engineering ‣ Fermentation Reactors See What Others Are Saying!
- Question
In aerobic yeast fermentation for production of citric acid from alkanes using a fed-batch culture, why alkanes are slowly fed to the yeast?
Options- A. Citric acid is toxic to the cells
- B. Alkanes cause foaming
- C. Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
- D. Fast addition of alkanes will cause the cells to grow too quickly
- Correct Answer
- Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
- 1. An open system in which the growth rate is maintained by the removal and addition of media at such a rate as to maintain a constant cell density is called a
Options- A. manostat
- B. chemostat
- C. turbidostat
- D. culturostat Discuss
- 2. Gas hold up, characterizing the hydrodynamics in a fermenter, mainly depends on the
Options- A. superficial gas velocity
- B. power consumption
- C. Both (a) and (b)
- D. gas concentration Discuss
- 3. Hersperidinase is used for
Options- A. juice clarification
- B. juice debittering
- C. off flavour reduction
- D. RNA reduction in fish Discuss
- 4. For cost analysis in a fermentor system, the depreciation cost varies from
Options- A. 5-6% of the capital cost
- B. 6-7% of the capital cost
- C. 6-10% of the capital cost
- D. 8-10% of the capital cost Discuss
- 5. Fluidized bed bioreactors provide higher mass transfer rates than packed bed bioreactors because
Options- A. mixing is higher in fluidized bed bioreactors
- B. particles move with the fluid in a fluidized bed bioreactor
- C. immobilized particles are smaller in the fluidized bed bioreactors
- D. all of the above Discuss
- 6. Which of the following is correct for the prediction of time requirement in a batch fermenter?
Options- A. Carrying out experiments
- B. Mathematical modelling of the fermentation process
- C. Both (a) and (b)
- D. It is impossible to predict the time required for fermentation Discuss
- 7. Toxins accumulated in a reactor can lead to low biomass yields probably due to which of the following?
Options- A. NAD+ is diverted away from homeostasis to anabolism
- B. ATP is diverted away from homeostasis to anabolism
- C. NAD+ is diverted away from anabolism to homeostasis
- D. ATP is diverted away from anabolism to homeostasis Discuss
- 8. Hardness of water does not
Options- A. have any bad effect in boiler
- B. make cooking of foods difficult
- C. make it unfit for drinking
- D. cause difficulty in the washing of clothes with soaps Discuss
- 9. In animal cell bioreactor, bubble damage can be minimized by
Options- A. the addition of a shear protectorant
- B. using a bubble free oxygen delivery system
- C. headspace aeration
- D. all of the above Discuss
- 10. The specific growth rate (?) is defined as
Options- A. the concentration of biomass in the reactor
- B. rate of increase of total biomass in a reactor
- C. the rate of individual cells division or increase in their biomass
- D. the rate of cell death Discuss
More questions
Correct Answer: turbidostat
Correct Answer: Both (a) and (b)
Correct Answer: juice clarification
Correct Answer: 6-10% of the capital cost
Correct Answer: particles move with the fluid in a fluidized bed bioreactor
Correct Answer: Both (a) and (b)
Correct Answer: ATP is diverted away from anabolism to homeostasis
Correct Answer: make it unfit for drinking
Correct Answer: all of the above
Correct Answer: the rate of individual cells division or increase in their biomass
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