Agitation And Aeration

Agitation And Aeration | Biochemical Engineering

For aerated mixing vessels in an aqueous solution, the mass transfer coefficient (kL) co-relating power consumption (Pm) and fermenter volume (V) can be expressed as

Question: For aerated mixing vessels in an aqueous solution, the mass transfer coefficient (kL) co-relating power consumption (Pm) and fermenter volume (V) can be expressed as
[A].
kL ∝ (Pm/V)0.33
[B].
kL ∝ (Pm/V)0.66
[C].
kL ∝ (Pm/V)0.50
[D].
kL ∝ (Pm/V)

Answer: Option A

Explanation:

No answer description available for this question.

Read More For aerated mixing vessels in an aqueous solution, the mass transfer coefficient (kL) co-relating power consumption (Pm) and fermenter volume (V) can be expressed as
Agitation And Aeration | Biochemical Engineering

The dynamic technique is based on the

Question: The dynamic technique is based on the
[A].
oxygen material balance in an aerated batch fermenter during the growth of microorganisms
[B].
change of the oxygen concentration
[C].
oxidation of the sodium sulfite to sodium sulfate
[D].
oxygen material balance in a fermenter

Answer: Option A

Explanation:

No answer description available for this question.

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Agitation And Aeration | Biochemical Engineering

The oxygen absorption rate can be determined by

Question: The oxygen absorption rate can be determined by
[A].
sodium sulfite oxidation method
[B].
dynamic gassing out technique
[C].
direct measurement
[D].
all of these

Answer: Option D

Explanation:

No answer description available for this question.

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Agitation And Aeration | Biochemical Engineering

The power required by an impeller in a gas sparged system compare to the power required by impeller operating at same speed in a gas free liquid is usually

Question: The power required by an impeller in a gas sparged system compare to the power required by impeller operating at same speed in a gas free liquid is usually
[A].
lesser
[B].
higher
[C].
same
[D].
may be lesser or higher depending upon the geometry

Answer: Option A

Explanation:

No answer description available for this question.

Read More The power required by an impeller in a gas sparged system compare to the power required by impeller operating at same speed in a gas free liquid is usually
Agitation And Aeration | Biochemical Engineering

In a two-phase system where the continuous phase remains in place, the gas hold up can be expressed as (where Vs and Vt are the superficial gas velocity and bubble rise velocity)

Question: In a two-phase system where the continuous phase remains in place, the gas hold up can be expressed as (where Vs and Vt are the superficial gas velocity and bubble rise velocity)
[A].
H = Vs/(Vs-Vt)
[B].
H = Vs/(Vs+ Vt)
[C].
H = Vs/(Vs.Vt)
[D].
H = (Vs+Vt)/Vs

Answer: Option B

Explanation:

No answer description available for this question.

Read More In a two-phase system where the continuous phase remains in place, the gas hold up can be expressed as (where Vs and Vt are the superficial gas velocity and bubble rise velocity)
Agitation And Aeration | Biochemical Engineering

The average fractional gas hold up (H) can be given as (where Zf and Zl are the level of aerated and clear liquid respectively)

Question: The average fractional gas hold up (H) can be given as (where Zf and Zl are the level of aerated and clear liquid respectively)
[A].
H = (Zf-Zl)/Zf
[B].
H = Zf/Zl
[C].
H = Zf/ZfZl
[D].
H =(Zf+Zl)/Zf

Answer: Option A

Explanation:

No answer description available for this question.

Read More The average fractional gas hold up (H) can be given as (where Zf and Zl are the level of aerated and clear liquid respectively)
Agitation And Aeration | Biochemical Engineering

Gas hold up, characterizing the hydrodynamics in a fermenter, mainly depends on the

Question: Gas hold up, characterizing the hydrodynamics in a fermenter, mainly depends on the
[A].
superficial gas velocity
[B].
power consumption
[C].
Both (a) and (b)
[D].
gas concentration

Answer: Option C

Explanation:

No answer description available for this question.

Read More Gas hold up, characterizing the hydrodynamics in a fermenter, mainly depends on the
Agitation And Aeration | Biochemical Engineering

Surface renewal theory predicts that the mass transfer coefficient is

Question: Surface renewal theory predicts that the mass transfer coefficient is
[A].
directly proportional to the square root of the molecular diffusivity
[B].
inversely proportional to the square root of the molecular diffusivity
[C].
directly proportional to the cube root of the molecular diffusivity
[D].
indirectly proportional to the cube root of the molecular diffusivity

Answer: Option A

Explanation:

No answer description available for this question.

Read More Surface renewal theory predicts that the mass transfer coefficient is
Agitation And Aeration | Biochemical Engineering

Penetration theory assumes that turbulent eddies travel from the bulk of the phase to the interface where they remain constant for a constant exposure time (te). The model correlating KL, mass transfer coefficient and DAB, diffusivity can be expressed as

Question: Penetration theory assumes that turbulent eddies travel from the bulk of the phase to the interface where they remain constant for a constant exposure time (te). The model correlating KL, mass transfer coefficient and DAB, diffusivity can be expressed as
[A].
KL = 2(DAB/πte)0.25
[B].
KL = 2(DAB/πte)0.5
[C].
KL = 2(DAB/πte)0.75
[D].
KL = 2(DAB/πte)

Answer: Option B

Explanation:

No answer description available for this question.

Read More Penetration theory assumes that turbulent eddies travel from the bulk of the phase to the interface where they remain constant for a constant exposure time (te). The model correlating KL, mass transfer coefficient and DAB, diffusivity can be expressed as
Agitation And Aeration | Biochemical Engineering

Which of the following model holds correct for the two-film theory? (where KL is the mass transfer coefficient, DAB diffusivity and Zf film thickness)

Question: Which of the following model holds correct for the two-film theory? (where KL is the mass transfer coefficient, DAB diffusivity and Zf film thickness)
[A].
KL = DAB/Zf
[B].
KL = DAB
[C].
KL= Zf/DAB
[D].
KL = DAB.Zf

Answer: Option A

Explanation:

No answer description available for this question.

Read More Which of the following model holds correct for the two-film theory? (where KL is the mass transfer coefficient, DAB diffusivity and Zf film thickness)