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Biochemical Engineering - Agitation and Aeration

Exercise : Agitation and Aeration - Section 3
11.
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)
H = Vs/(Vs-Vt)
H = Vs/(Vs+ Vt)
H = Vs/(Vs.Vt)
H = (Vs+Vt)/Vs
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
What is the effect of the concentration of dissolved salts and sugars on the oxygen transfer rate?
The saturation concentration of oxygen in the medium decreases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate
The KLa of the medium decreases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate
The KLa of the medium increases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
Which of the following impellers generate a flow parallel to the axis of shaft?
Axial flow
Radial flow
Both (a)and(b)
None of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
In a tall reactor, oxygen transfer rates will be
highest at the surface of the reactor
highest at the base of the reactor
highest in the middle of the reactor
the same throughout the reactor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Which of the following impeller is used in situation where strong vertical currents are desirable for suspending heavily particles?
Propeller
Paddle
Turbine
None of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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