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- Question
Wash out in steady state fermentation occurs when
Options- A. dilution rate is less than maximum specific growth rate
- B. dilution rate is higher than the maximum specific growth rate
- C. cell concentration reaches the maximum
- D. specific growth rate is maximum
- Correct Answer
- dilution rate is higher than the maximum specific growth rate
- 1. Why a T-flask used in small-scale cell culture is incubated in a horizontal position?
Options- A. To save space
- B. To increase the surface area of the liquid-air interface
- C. Both (a) and (b)
- D. To increase the rate of oxygen transfer into the liquid Discuss
- 2. 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
- 3. 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
- 4. The number of baffles in a standard stirred tank bioreactor is
Options- A. 8
- B. 6
- C. 4
- D. 2 Discuss
- 5. Heat transfer rates (per unit volume) will be lowest in
Options- A. Stirred tank bioreactor with biomass recycle
- B. Continuous air lift bioreactor
- C. Continuous packed bed reactor
- D. Continuous fluidized bed bioreactor Discuss
- 6. Which of the following is not correct for the Monod model and the Michaelis Menten Model?
Options- A. The Michaelis Menten Model was derived from a curve fitting exercise
- B. The Michaelis Menten model was derived from an analysis of the mechanism of microbial growth
- C. The Monod model was derived from an analysis of the mechanism of microbial growth
- D. All of the above Discuss
- 7. In the accelerated phase, cell starts to
Options- A. increase and the division rate increases to reach a maximum
- B. decrease and the division rate increases to reach a maximum
- C. increase and the division rate decreases to reach a maximum
- D. increase and the division rate increases to reach a minimum Discuss
- 8. An open system in which the growth rate is maintained by adding a nutrient (present in limiting quantities) at the same rate as that medium containing micro-organisms is removed is called
Options- A. manostat
- B. chemostat
- C. turbidostat
- D. culturostat Discuss
- 9. The height to diameter ratio (H/D) for the column fermenters is
Options- A. <3
- B. >3
- C. <1.5
- D. >1.5 Discuss
- 10. In the stationary phase
Options- A. growth is proportional to death
- B. growth rate is equal to death rate
- C. growth rate is lesser than death rate
- D. no co-relation exist between death rate and growth rate Discuss
Fermentation Kinetics problems
Search Results
Correct Answer: Both (a) and (b)
Correct Answer: external pumping
Correct Answer: log of number of cells versus time
Correct Answer: 4
Correct Answer: Continuous packed bed reactor
Correct Answer: The Monod model was derived from an analysis of the mechanism of microbial growth
Correct Answer: increase and the division rate increases to reach a maximum
Correct Answer: chemostat
Correct Answer: >3
Correct Answer: growth rate is equal to death rate
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