Biochemical Engineering

Question: The function of the disengagement zone in an airlift fermenter is to
[A].

prevent CO2 rich bubbles from entering the downcomer

[B].

reduce the velocity of the bubbles

[C].

reduce liquid loss as aerosols

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: In an airlift bioreactor, the spent gases released from the liquid are called
[A].

downcomer

[B].

disengagement zone

[C].

air riser

[D].

flotsam

Answer: Option B

Explanation:

No answer description available for this question.

Question: The region of an airlift bioreactor in which the liquid travels in a downward direction is called the
[A].

downcomer

[B].

disengagement zone

[C].

air riser

[D].

flotsam

Answer: Option A

Explanation:

No answer description available for this question.

Question: The contents in bubble column and air lift reactor are mixed through
[A].

compressed air

[B].

a mechanical internal moving part

[C].

external pumping

[D].

any of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: An internal draft tube is preferrred to an external draft tube because
[A].

it is easier to clean and sterilize a reactor

[B].

it is cheaper to build a reactor with an internal draft tube

[C].

Both (a) and (b)

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of
[A].

higher oxygen transfer rates

[B].

a small sparge ring

[C].

better heat transfer efficiencies

[D].

all of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: The contents in stirred tank rector are mixed through
[A].

compressed air

[B].

a mechanical agitator

[C].

external pumping

[D].

any of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: The height to diameter ratio (H/D) for the column fermenters is
[A].

<3

[B].

>3

[C].

<1.5

[D].

>1.5

Answer: Option B

Explanation:

No answer description available for this question.

Question: The height to diameter ratio (H/D) for the tank fermenters is
[A].

<3

[B].

>3

[C].

<1.5

[D].

>1.5

Answer: Option A

Explanation:

No answer description available for this question.

Question: Turbidostat is recommended when continuous fermentation needs to be carried out at
[A].

high dilution rates near the washout point

[B].

low dilution rates near the washout point

[C].

moderate dilution rates near the washout point

[D].

any intensity of dilution rates near the washout point

Answer: Option A

Explanation:

No answer description available for this question.