Biochemical Engineering

Question: An open system in which the growth rate is maintained by the removal and addition of media at such a rate as to maintain a constant cell density is called a
[A].

manostat

[B].

chemostat

[C].

turbidostat

[D].

culturostat

Answer: Option C

Explanation:

No answer description available for this question.

Question: Fermentor should be filled with medium upto
[A].

65-70%

[B].

70-75%

[C].

75-80%

[D].

80-85%

Answer: Option C

Explanation:

No answer description available for this question.

Question: Heat transfer rates (per unit volume) will be lowest in
[A].

Stirred tank bioreactor with biomass recycle

[B].

Continuous air lift bioreactor

[C].

Continuous packed bed reactor

[D].

Continuous fluidized bed bioreactor

Answer: Option C

Explanation:

No answer description available for this question.

Question: In wastewater treatment, which bioreactor is generally used?
[A].

Plug flow reactor

[B].

Trickle bed reactor

[C].

Tower fermentor

[D].

CSTR

Answer: Option B

Explanation:

No answer description available for this question.

Question: Tower fermentors are used for
[A].

continuous penicillin production

[B].

continuous beer production

[C].

production of enzymes

[D].

batch production of beer

Answer: Option B

Explanation:

No answer description available for this question.

Question: Bubble column reactor has
[A].

large height to diameter ratio

[B].

small height to diameter ratio

[C].

large diameter to height ratio

[D].

small diameter to height ratio

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following is incorrect?
[A].

The mechanical agitation and aeration are effective for suspension of cells

[B].

The mechanical agitation and aeration are effective for mixing the medium

[C].

STF can’t be used for high viscosity medium

[D].

The mechanical agitation and aeration are effective for oxygenation

Answer: Option C

Explanation:

No answer description available for this question.

Question: Residence time distribution (RTD) of a reactor is independent of
[A].

micro mixing

[B].

volume of reactor

[C].

height of the reactor

[D].

width of the reactor

Answer: Option A

Explanation:

No answer description available for this question.

Question: Lag phase occurs mainly due to
[A].

acclimatization with new environment and substrate

[B].

higher growth temperature

[C].

substrate disliking

[D].

variation in substrate concentration

Answer: Option A

Explanation:

No answer description available for this question.

Question: In the stationary phase
[A].

growth is proportional to death

[B].

growth rate is equal to death rate

[C].

growth rate is lesser than death rate

[D].

no co-relation exist between death rate and growth rate

Answer: Option B

Explanation:

No answer description available for this question.