Fermentation Reactors MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Fermentation Reactors, a fundamental topic in the field of Biochemical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Fermentation Reactors MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Fermentation Reactors mcq questions that explore various aspects of Fermentation Reactors problems. Each MCQ is crafted to challenge your understanding of Fermentation Reactors principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Biochemical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Fermentation Reactors MCQs are your pathway to success in mastering this essential Biochemical Engineering topic.

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Fermentation Reactors MCQs | Page 7 of 7

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Q61.
Which of the following is not correct with regards to continuous cultures?

a.

The major industrial scale application of continuous cultures is in waste water treatment

b.

Mutation and contamination present a major risk to the operation of continuous cultures for the production of metabolites

c.

The continuous cultures is very useful for the production of pharmaceuticals

d.

Continuous cultures have an advantage that they do not need to shut down as regularly as batch culture reactor

Discuss
Answer: (c).The continuous cultures is very useful for the production of pharmaceuticals
Q62.
In a plug flow reactor, the highest concentration of substrates is exposed to the cells that

a.

are near the effluent or exit of the reactor

b.

are in the mid way along the reactor

c.

are located near entrance of feed

d.

are near the wall of the reactor

Discuss
Answer: (c).are located near entrance of feed
Q63.
In an activated sludge process, the biomass is recycled to

a.

increase the efficiency of the process

b.

reduce sludge volumes

c.

increase the concentration of cells

d.

all of the above

Discuss
Answer: (d).all of the above
Q64.
A strain of Escherichia coli has a maximum specific growth rate of 0.8 h­¹ on a glucose based medium. If this organism is being grown in a chemostat with a dilution rate of 1.2 h­¹, then at steady state the concentration of E. coli in the same medium will

a.

increase

b.

be zero

c.

change randomly

d.

decrease

Discuss
Answer: (b).be zero
Q65.
A fed-batch reactor containing 2 litre of medium and 0.1 g.l­¹ of biomass is fed with a medium containing 1 g.l­¹ of substrate at 1 litre per hour. If after 10 hours, the concentration of biomass in the reactor was 0.2 g.l­¹, then the biomass produced during the 10 hour period is

a.

1.5 g

b.

2.2 g

c.

3.0 g

d.

6.0 g

Discuss
Answer: (b).2.2 g
Q66.
Which of the following organisms will continue their metabolism at high substrate concentrations?

a.

Pseudomonas aeruginosa

b.

Saccharomyces cerevisiae

c.

Bacillus subtilis

d.

Escherichia coli

Discuss
Answer: (a).Pseudomonas aeruginosa
Q67.
Yeast is typically produced in fed batch reactors because

a.

yeast cells produce ethanol at low glucose concentrations

b.

yeast cells ferment at low glucose concentrations

c.

yeast cells respire at low glucose concentrations

d.

all of the above

Discuss
Answer: (c).yeast cells respire at low glucose concentrations
Q68.
Two continuous bioreactors containing the same organisms, fed with the same feed at the same dilution rate were compared. Reactor 1 started with an initial concentration of glucose of 10 g.l­¹, while reactor 2 contained 0.1 g.l­¹ of glucose at the start of the process then at steady state

a.

the concentration of glucose in reactor 1 would be greater than that in reactor 2

b.

the concentration of glucose in reactor 1 would be equal to reactor 2

c.

the concentration of glucose in reactor 1 would always be zero.

d.

the concentration of glucose in reactor 1 would be less than that in reactor 2

Discuss
Answer: (b).the concentration of glucose in reactor 1 would be equal to reactor 2
Q69.
In a fluidized bed reactor mixing is achieved by

a.

gravity flow of fluid

b.

upward movement of the incoming feed

c.

diffusion

d.

both (a) and (b)

Discuss
Answer: (d).both (a) and (b)
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