Biochemical Engineering

Question: Bacterial growth curve is obtained by plotting
[A].

number of cells versus time

[B].

number fo spores versus time

[C].

log of number of cells versus time

[D].

log of number of cells survived versus time

Answer: Option C

Explanation:

No answer description available for this question.

Question: Population doubling time, td can be expressed as (where μ is the specific growth rate.)
[A].

log2/μ

[B].

ln2/μ

[C].

μ/ln2

[D].

μ/log2

Answer: Option B

Explanation:

No answer description available for this question.

Question: Wash out in steady state fermentation occurs when
[A].

dilution rate is less than maximum specific growth rate

[B].

dilution rate is higher than the maximum specific growth rate

[C].

cell concentration reaches the maximum

[D].

specific growth rate is maximum

Answer: Option B

Explanation:

No answer description available for this question.

Question: A higher Ks value of Monod’s equation means
[A].

greater affinities to substrate

[B].

lower affinities to substrate

[C].

unaffected with the substrate bonding

[D].

lower dissociation constant value

Answer: Option A

Explanation:

No answer description available for this question.

Question: A functional relationship between the specific growth rate and essential compounds concentration was proposed by Monod in
[A].

1958

[B].

1946

[C].

1942

[D].

1950

Answer: Option C

Explanation:

No answer description available for this question.

Question: The dilution rate, D is defined as(where F = volumetric flow rate, VR = total volume of culture in the reactor and μ specific growth rate)
[A].

F/VR

[B].

VR/F

[C].

μ/F

[D].

F/μ

Answer: Option A

Explanation:

No answer description available for this question.

Question: Chemostats work on the principle of
[A].

maintaining constant volume of culture medium

[B].

maintaining continuous flow of nutrients

[C].

maintaining uniform nutrients concentration

[D].

operating at higher pressure

Answer: Option C

Explanation:

No answer description available for this question.

Question: An open system in which the growth rate is maintained by adding a nutrient (present in limiting quantities) at the same rate as that medium containing micro-organisms is removed is called
[A].

manostat

[B].

chemostat

[C].

turbidostat

[D].

culturostat

Answer: Option B

Explanation:

No answer description available for this question.

Question: A culture in a closed vessel to which no additional medium is added and from which no waste products are removed is called a __________ culture.
[A].

continuous

[B].

batch

[C].

fed-batch

[D].

semi continuous

Answer: Option B

Explanation:

No answer description available for this question.

Question: The function of a mechanical seal is to
[A].

prevent contaminants entering the reactor

[B].

prevent cells from leaving the reactor

[C].

both (a) and (b)

[D].

prevent air to enter

Answer: Option C

Explanation:

No answer description available for this question.