Sterilization

Question: If the packing density (α) is defined as the volume of the fiber unit volume of filter bed, the velocity within the filter void space is equal to (where V is velocity in fluid void space and V0 is undisturbed fluid velocity)
[A].

V = V0/(1-α)

[B].

V-V0 = 1 – α

[C].

V = V0(1 – α)

[D].

V = V0/(1 + α)

Answer: Option A

Explanation:

No answer description available for this question.

Question: The heat conduction in dry air is
[A].

less rapid than in steam

[B].

more rapid than in steam

[C].

similar to steam

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: The moist heat is more effective than the dry heat because the intrinsic heat resistance of vegetative cells is greatly
[A].

increased in a dry state

[B].

decreased in a dry state

[C].

increased in a wet state

[D].

decreased in a wet state

Answer: Option A

Explanation:

No answer description available for this question.

Question: The sterilization method depends
[A].

nature of additive

[B].

volume and feed rate

[C].

both (a) and (b)

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Glass fibers are favorable as a filter medium because they give a
[A].

lower pressure drop and are less liable to wetting or combustion

[B].

more pressure drop and are less liable to wetting or combustion

[C].

lower pressure drop and are more liable to wetting or combustion

[D].

more pressure drop and are more liable to wetting or combustion

Answer: Option A

Explanation:

No answer description available for this question.

Question: Typical aeration rates for aerobic fermentation are
[A].

0 – 0.5 vvm

[B].

0.5 – 1.0 vvm

[C].

1.0 – 1.5 vvm

[D].

1.5 – 2.0 vvm

Answer: Option B

Explanation:

No answer description available for this question.

Question: For the turbulent flow, the dispersion coefficient is correlated as a function of
[A].

Reynolds number

[B].

Sherwood number

[C].

Schmidt number

[D].

Grashof number

Answer: Option A

Explanation:

No answer description available for this question.

Question: Analogus to the molecular diffusion, the x-directional flux of microorganisms suspended in a medium due to the axial mixing can be represented as (where Jn is flux component ‘n’, cn is concentration of’n’)
[A].

Jn = -dcn/dx

[B].

Jn = dcn/dx

[C].

Jn = -D dcn/dx

[D].

Jn = D dcn/dx

Answer: Option C

Explanation:

No answer description available for this question.

Question: The deviation from ideal plug flow due to axial mixing can be described by the
[A].

dispersion model

[B].

Langmuir model

[C].

Friedlander model

[D].

Pasceri model

Answer: Option A

Explanation:

No answer description available for this question.

Question: For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is
[A].

0.5

[B].

0.75

[C].

0.87

[D].

0.37

Answer: Option A

Explanation:

No answer description available for this question.