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Home ‣ Biochemical Engineering ‣ Fermentation Reactors See What Others Are Saying!
- Question
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
- Correct Answer
- particles move with the fluid in a fluidized bed bioreactor
- 1. The X90 value for a filtration system is
Options- A. the time required to reduce microbial population by 90%
- B. the time required to traverse survivor curve by one log cycle.
- C. the depth required to reduce population by 90%
- D. the depth of the filter required to reduce population by 99% Discuss
- 2. The effectiveness of a solvent can be measured by the
Options- A. distribution coefficients
- B. selectivity
- C. both (a) and (b)
- D. diffusivity Discuss
- 3. When two populations compete for a single growth limiting substrate in a continuous fermenter, which organism would not be washed out?
Options- A. Organism maintaining the highest substrate concentration
- B. Organism maintaining the lowest substrate concentration
- C. Both (a) and (b)
- D. Organism maintaining the moderate substrate concentration Discuss
- 4. On a glucose medium, the growth of an organism is characterized by the following Monod model and stoichiometric parameters ?m = 0.3 h-1, Ks =0.05 g.l-1 and Yxs = 0.3 g.g-1 When this organism is grown in a 2 litre continuous on a medium containing 10 g.l-1 of glucose added at 1 l.h-1, the steady state concentration of biomass in the reactor will be
Options- A. 0 g.l-1
- B. 0.4 g.l-1
- C. 0.5 g.l-1
- D. 10 g.l-1 Discuss
- 5. To measure the extent to which the reaction rate is lowered because of resistance to mass transfer, the effectiveness factor of an immobilized enzyme, ? can be defined as
Options- A. reaction rate/rate if not slowed by diffusion
- B. rate if not slowed by diffusion/ reaction rate
- C. actual reaction rate/ rate if not slowed by diffusion
- D. rate if not slowed by diffusion/ actual reaction rate Discuss
- 6. The immobilized enzyme produced by micro encapsulation technique provides
Options- A. an extremely large surface area
- B. smaller surface area
- C. high amount of solvent
- D. relatively smaller surface area Discuss
- 7. Which of the statement is true for continuous reactor at steady state?
Options- A. The rates of biomass, substrate and product concentrations are zero
- B. Biomass, substrate and product concentrations are zero
- C. Biomass, substrate and product concentrations do not change with time
- D. Biomass, substrate and product concentrations change with time Discuss
- 8. Start up expenses in a fermentation industry varies from
Options- A. 0-5% of the capital cost
- B. 10-15% of the capital cost
- C. 5-10% of the capital cost
- D. 15-20% of the capital cost Discuss
- 9. Given an enzyme with a Km = 10m M and Vmax = 100 m mol/min. If [S] = 100 m M, which of the following will be true?
Options- A. A 10 fold increase in Vmax would increase velocity 10 fold y
- B. A 10 fold decrease in Km would increase velocity
- C. Both (a) and (b)
- D. A 10 fold increase in Vmax would decrease velocity 20 fold Discuss
- 10. During fermentation, the saturation concentration of oxygen was reduced from 7 ppm. to 1 ppm. Which one of the following conclusions can be drawn?
Options- A. Microbial growth is oxygen limited since the oxygen concentration is lesser than the saturation concentration
- B. Microbial growth is not oxygen limited since the oxygen concentration is lesser than the saturation concentration
- C. Experimental error leads to the reduction
- D. No conclusion can be drawn Discuss
More questions
Correct Answer: the depth required to reduce population by 90%
Correct Answer: both (a) and (b)
Correct Answer: Organism maintaining the lowest substrate concentration
Correct Answer: 0 g.l-1
Correct Answer: actual reaction rate/ rate if not slowed by diffusion
Correct Answer: an extremely large surface area
Correct Answer: Biomass, substrate and product concentrations do not change with time
Correct Answer: 5-10% of the capital cost
Correct Answer: A 10 fold increase in Vmax would increase velocity 10 fold y
Correct Answer: No conclusion can be drawn
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