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Biochemical Engineering - Agitation and Aeration

Exercise : Agitation and Aeration - Section 1
6.
Which of the following impellers are used for wide range of viscosities?
paddles
turbines
propellers
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Which of the following type(s) of stirrer can be used for microbiological processes?
Mig
Intermig
Turbine
All of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
The range of width for the baffle in the fermenter is __________ times of vessel diameter
1/10 to 1/12
1/8 to 1/10
1/5 to 1/8
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
The average concentration of oxygen in the boundary layers surrounding the bubbles (Co*) in a reactor is normally determined by
ultra-small dissolved oxygen probes
laser based photographic systems
measuring the steady state concentration of oxygen in the bulk liquid prior to inoculation of the reactor
measuring the steady state concentration of oxygen in the bulk liquid after inoculation of the reactor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
Why vortexing is undesirable in the agitation of biological systems?
The collision between the cells, impeller and air bubbles will lead to cell damage
Poor mixing despite the use of high stirrer speeds
Mixing will not be in the turbulent region
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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