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Biochemical Engineering - Fermentation Reactors

Exercise : Fermentation Reactors - Section 1
21.
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
2g
6g
8g
12g
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Toxins accumulated in a reactor can lead to low biomass yields probably due to which of the following?
NAD+ is diverted away from homeostasis to anabolism
ATP is diverted away from homeostasis to anabolism
NAD+ is diverted away from anabolism to homeostasis
ATP is diverted away from anabolism to homeostasis
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
The cellular productivity in a continuous stirred tank fermenter (CSTF) increases with an increase in the dilution rate and reaches a maximum value. If the dilution rate is increased beyond the maximum point, the productivity will
decrease abruptly
increase
increase drastically
be zero
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Fluidized bed bioreactors provide higher mass transfer rates than packed bed bioreactors because
mixing is higher in fluidized bed bioreactors
particles move with the fluid in a fluidized bed bioreactor
immobilized particles are smaller in the fluidized bed bioreactors
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
In fed-batch fermentation, mass of substrate utilized is calculated using the relationship
initial mass of substrate in the reactor + final mass of substrate in the reactor + flow rate x [substrate in the feed]
initial mass of substrate in the reactor - final mass of substrate in the reactor + flow rate x [substrate in the feed]
initial mass of substrate in the reactor + final mass of substrate in the reactor - flow rate x [substrate in the feed]
initial mass of substrate in the reactor + final mass of substrate in the reactor - flow rate
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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