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 2 of 7

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Q11.
Which of the statement is true for continuous reactor at steady state?

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
Answer: (c).Biomass, substrate and product concentrations do not change with time
Q12.
A continuous bioreactor in which only the flow rate is used to control the rate of cell or product productivity is called

a.

turbidostat

b.

chemostat

c.

level stat

d.

pH

Discuss
Answer: (b).chemostat
Q13.
For organisms growing in a chemostat, the specific growth rate

a.

cannot be determined

b.

can be determined from the dilution rate

c.

equals to the maximum specific growth rate of the culture

d.

none of the above

Discuss
Answer: (b).can be determined from the dilution rate
Q14.
Saccharomyces cerevisiae is being grown in a chemostat converts glucose to biomass, ethanol, glycerol and carbon dioxide. At steady state, the concentration of glucose, biomass, ethanol and glycerol will

a.

decrease with time

b.

increase with time

c.

be constant

d.

change randomly with time

Discuss
Answer: (c).be constant
Q15.
In aerobic yeast fermentation for production of citric acid from alkanes using a fed-batch culture, why alkanes are slowly fed to the yeast?

a.

Citric acid is toxic to the cells

b.

Alkanes cause foaming

c.

Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates

d.

Fast addition of alkanes will cause the cells to grow too quickly

Discuss
Answer: (c).Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
Q16.
A fed-batch reactor containing 1 g.l­¹ 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.l­¹ . The mass of substrate that was used by the culture in the reactor was

a.

2g

b.

6g

c.

8g

d.

12g

Discuss
Answer: (b).6g
Q17.
Toxins accumulated in a reactor can lead to low biomass yields probably due to which of the following?

a.

NAD+ is diverted away from homeostasis to anabolism

b.

ATP is diverted away from homeostasis to anabolism

c.

NAD+ is diverted away from anabolism to homeostasis

d.

ATP is diverted away from anabolism to homeostasis

Discuss
Answer: (d).ATP is diverted away from anabolism to homeostasis
Q18.
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

a.

decrease abruptly

b.

increase

c.

increase drastically

d.

be zero

Discuss
Answer: (a).decrease abruptly
Q19.
Fluidized bed bioreactors provide higher mass transfer rates than packed bed bioreactors because

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

Discuss
Answer: (b).particles move with the fluid in a fluidized bed bioreactor
Q20.
In fed-batch fermentation, mass of substrate utilized is calculated using the relationship

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

Discuss
Answer: (b).initial mass of substrate in the reactor - final mass of substrate in the reactor + flow rate x [substrate in the feed]
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