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Biochemical Engineering - Agitation and Aeration

Exercise : Agitation and Aeration - Section 2
31.
Larger propellers turn at the speed of
20 to 150 rpm
150 to 300 rpm
400 to 800 rpm
1150 rpm
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
A microbial population in a suspension culture will only be limited by oxygen availability if the dissolved oxygen
concentration is less than the critical concentration
concentration is greater than the critical concentration
levels are greater than the saturation concentration of oxygen
levels are equal to saturation oxygen level
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
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)
KL = DAB/Zf
KL = DAB
KL = Zf/DAB
KL = DAB.Zf
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
Froude number is avoided in calculation of power requirements for low viscosity liquid mixing systems when
baffled systems are used
Reynolds number is less than 300
both (a)and(b)
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
A fermentation system has a KLa of 3 s-1 and a C0* of 5 ppm of O2. If the bulk liquid is completely depleted of oxygen, then the oxygen transfer rate will be equal to
zero
15 mg.l-1.s-1
10 mg.l-1.s-1
5 mg.l-1.s-1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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