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Fermentation Reactors

A chemostat has a liquid volume of 2 litres and is being fed at a rate of 4 litres per hour. Dilution rate for this reactor will be

Question: A chemostat has a liquid volume of 2 litres and is being fed at a rate of 4 litres per hour. Dilution rate for this reactor will be
[A].

2 litres

[B].

2 litres per hour

[C].

2 h-1

[D].

4 litres per hour

Answer: Option C

Explanation:

No answer description available for this question.

A chemostat has a liquid volume of 2 litres and is being fed at a rate of 4 litres per hour. Dilution rate for this reactor will be Read More »

Biochemical Engineering, Fermentation Reactors

A continuous bioreactor in which only the flow rate is used to control the rate of cell or product productivity is called

Question: 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

Answer: Option B

Explanation:

No answer description available for this question.

A continuous bioreactor in which only the flow rate is used to control the rate of cell or product productivity is called Read More »

Biochemical Engineering, Fermentation Reactors

Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is

Question: Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is
[A].

time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation

[B].

total amount in rector = rate of addition to reactor – rate of removal + rate of formation

[C].

rate of total amount in rector = rate of addition to reactor – rate of removal + rate of formation

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is Read More »

Biochemical Engineering, Fermentation Reactors

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

Question: 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

Answer: Option A

Explanation:

No answer description available for this question.

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 Read More »

Biochemical Engineering, Fermentation Reactors

A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.

Question: A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.
[A].

continuous

[B].

batch

[C].

fed-batch

[D].

semi continuous

Answer: Option A

Explanation:

No answer description available for this question.

A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system. Read More »

Biochemical Engineering, Fermentation Reactors

The continuous cultures are not widely used in industry because

Question: The continuous cultures are not widely used in industry because
[A].

they are not suited for the production of secondary metabolites

[B].

contamination or mutation can have a disastrous effect on the operation

[C].

the government will not approve the licensing of pharmaceuticals produced in continuous cultures

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

The continuous cultures are not widely used in industry because Read More »

Biochemical Engineering, Fermentation Reactors

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?

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?
[A].

50 g maltose.l-1

[B].

50 g lactate.l-1

[C].

200 g maltose.l-1

[D].

200 g lactate.l-1

Answer: Option D

Explanation:

No answer description available for this 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? Read More »

Biochemical Engineering, Fermentation Reactors

Continuous culture has an advantage over to a batch cultures as

Question: Continuous culture has an advantage over to a batch cultures as
[A].

continuous reactors do not need to be shut down and cleaned as regularly as a batch reactor

[B].

most downstream and upstream processes are continuous in nature and thus the operation of continuous bioreactor can be better integrated into the overall manufacturing process

[C].

cells can be maintained at a constant physiological state simply by setting the dilution rate

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Continuous culture has an advantage over to a batch cultures as Read More »

Biochemical Engineering, Fermentation Reactors

Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity?

Question: Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity?
[A].

Batch fermenter with a high initial glucose concentration

[B].

Continuous fermenter with a low initial glucose concentration

[C].

Fed batch fermenter

[D].

All of the above

Answer: Option C

Explanation:

No answer description available for this question.

Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity? Read More »

Biochemical Engineering, Fermentation Reactors

A fed-batch reactor containing 2 litre of medium and 0.1 g.l-l of biomass is fed with a medium containing 1 g.l-1 of substrate at 1 litre per hour. If after 10 hours, the concentration of biomass in the reactor was 0.2 g.l-1, then the biomass produced during the 10 hour period is

Question: A fed-batch reactor containing 2 litre of medium and 0.1 g.l-l of biomass is fed with a medium containing 1 g.l-1 of substrate at 1 litre per hour. If after 10 hours, the concentration of biomass in the reactor was 0.2 g.l-1, 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

Answer: Option B

Explanation:

No answer description available for this question.

A fed-batch reactor containing 2 litre of medium and 0.1 g.l-l of biomass is fed with a medium containing 1 g.l-1 of substrate at 1 litre per hour. If after 10 hours, the concentration of biomass in the reactor was 0.2 g.l-1, then the biomass produced during the 10 hour period is Read More »

Biochemical Engineering, Fermentation Reactors