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Biochemical Engineering - Agitation and Aeration

Exercise : Agitation and Aeration - Section 3
6.
Axial flow impellers
provide high shear conditions for breaking up bubbles
provide low shear conditions and are suited for use in shear sensitive procesess
provide direct flow towards the walls of the reactor
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Bioreactors, where vortex is formed, another dimensionless number, __________ is useful.
Stanton
Rayleigh
Bond
Froude
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
Oxygen transfer rate is increased with an increase in the stirrer speed in aerated bioreactor because
it decrease the bubble size
it decreases the size of the boundary layer surrounding a bubble
it increases the rate of movement of oxygen molecules through the bulk liquid
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
If the stirring speed increased from 300 to 500 rpm leads to an increase in the reaction rate by two folds. Then it may be concluded that
the reaction was mass transfer limited at 300 rpm
the reaction was mass transfer limited at 500 rpm
the reaction did not involve any mass transfer step
the movement of molecules in the reactor at 300 rpm occurred due to diffusion alone
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
An increase in the heat transfer in the stirred tank reactor will be observed at
higher cooling water temperature
higher stirrer speed
the removal of baffles from the reactor
slower stirrer speed
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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