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- Question
In a continuous reactor, the medium contains 40 g.l-1 of maltose and the medium flow rate is 10 litres per hour and the effluent contains 20 g.l-l of lactate. What is the productivity of lactate production from this reactor?
Options- A. 50 g maltose.l-1
- B. 50 g lactate.l-1
- C. 200 g maltose.l-1
- D. 200 g lactate.l-1
- Correct Answer
- 200 g lactate.l-1
- 1. A continuous reactor at steady state contains 0.04 g.l-1 of biomass and 0.02 g.l-1 of phenol. The feed contained 0.1 g.l-1 of phenol. The biomass yield would be
Options- A. 0.4 g.g-1
- B. 0.5 g.g-1
- C. 1.0 g.g-1
- D. 5.0 g.g-1 Discuss
- 2. A fed-batch reactor containing 1 g.l-1 of substrate in 2 litre of medium. It is fed with 1 g.l-l of substrate at the rate of 1 litre per hour. After 10 hours, the concentration of substrate in the reactor was 0.5 g.l-1 . The mass of substrate that was used by the culture in the reactor was
Options- A. 2g
- B. 6g
- C. 8g
- D. 12g Discuss
- 3. 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
- 4. For a steady state condition, the change of substrate concentration (dCs/dt) is
Options- A. zero
- B. 1
- C. >1
- D. <1 Discuss
- 5. Commonly employed water insoluble supports for the covalent attachment of enzyme include
Options- A. acrylamide based polymers
- B. polypeptides
- C. dextran
- D. all of these Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Fermentation Reactors problems
Search Results
Correct Answer: 0.5 g.g-1
Correct Answer: 6g
Correct Answer: actual reaction rate/ rate if not slowed by diffusion
Correct Answer: zero
Correct Answer: all of these
Correct Answer: 0 g.l-1
Correct Answer: Escherichia coli
Correct Answer: continuous
Correct Answer: it can maintain low ethanol concentrations
Correct Answer: all of the above
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