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- Question
In fed-batch fermentation, mass of substrate utilized is calculated using the relationship
Options- A. initial mass of substrate in the reactor + final mass of substrate in the reactor + flow rate x [substrate in the feed]
- B. initial mass of substrate in the reactor - final mass of substrate in the reactor + flow rate x [substrate in the feed]
- C. initial mass of substrate in the reactor + final mass of substrate in the reactor - flow rate x [substrate in the feed]
- D. initial mass of substrate in the reactor + final mass of substrate in the reactor - flow rate
- Correct Answer
- initial mass of substrate in the reactor - final mass of substrate in the reactor + flow rate x [substrate in the feed]
- 1. Which of the following enzyme is responsible for causing vitamin B deficiency disease beriberi?
Options- A. Ascorbic acid oxidase
- B. Thiaminase
- C. Lipoxygenase
- D. None of these Discuss
- 2. A cylindrical reactor has a liquid volume of 100,000 litres. It has an aspect ratio the ratio of the channel height to width of 1:1. The height of the liquid in the reactor will be approximately:
Options- A. 1.0 m
- B. 3.0 m
- C. 5.0 m
- D. 7.0 m Discuss
- 3. Mixing profiles closest to plug flow are observed in
Options- A. continuous packed bed reactor
- B. stirred tank reactor with biomass recycles
- C. continuous fluidized bed bioreactor
- D. all of these Discuss
- 4. Conventional adsorption is a
Options- A. reversible process
- B. irreversible process
- C. either reversible or irreversible
- D. none of these Discuss
- 5. The active site of an enzyme remains
Options- A. at the center of globular proteins
- B. rigid and does not change shape
- C. complementary to the rest of the molecule
- D. none of the above Discuss
- 6. A fluid in which the viscosity decreases with increasing stirrer speed and mixing time, can be represented as
Options- A. newtonian fluid
- B. pseudoplastic, thixotropic fluid
- C. dilatant, rheopectic fluid
- D. dilatant, pseudoplastic fluid Discuss
- 7. The destruction of microorganisms by steam may be described as
Options- A. first order chemical reaction
- B. zero order chemical reaction
- C. second order chemical reaction
- D. none of these Discuss
- 8. The efficiency of fibrous filter by combined mechanism is given by(where ?imp,?int,?dif are the efficiencies by impaction, interception and diffusion respectively)
Options- A. 1 - ?imp?int?dif
- B. 1 - (1 - ?imp)(1 - ?int)( 1 - ?dif)
- C. 1 - ( ?imp?int/?dif)
- D. None of the above Discuss
- 9. Which of the following would be correct concerning the concentration of biomass (X). growth limiting substrate (S) and product (P) in a chemostat when the cells have been washed out?
Options- A. X,S and P will be zero
- B. X,S and P can not be predicted for the above condition
- C. X and P will be zero while S is equal to the substrate concentration in feed
- D. None of the above Discuss
- 10. The relatively large volume (10 to 40% of total fermenter volume) of the seed culture is employed to
Options- A. increase the overall fermentation time
- B. increase the overall yield of biomass
- C. decrease the overall fermentation time
- D. decrease the overall yield of product Discuss
More questions
Correct Answer: Thiaminase
Correct Answer: 5.0 m
Correct Answer: continuous packed bed reactor
Correct Answer: reversible process
Correct Answer: none of the above
Correct Answer: pseudoplastic, thixotropic fluid
Correct Answer: first order chemical reaction
Correct Answer: 1 - ?imp?int?dif
Correct Answer: X and P will be zero while S is equal to the substrate concentration in feed
Correct Answer: decrease the overall fermentation time
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