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Biochemical Engineering - Agitation and Aeration

Exercise : Agitation and Aeration - Section 2
6.
Pure oxygen, if used instead of air will increase oxygen transfer rates because
the saturation concentration of oxygen is higher
the bubble size is smaller
the oxygen transfer coefficient is larger
the partial pressure of oxygen in the gas phase is lower
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
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
kL ∝ (Pm/V)0.33
kL ∝ (Pm/V)0.66
kL ∝ (Pm/V)0.50
kL ∝ (Pm/V)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
Higher temperatures affect oxygen transfer rates by
increasing KLa but lowering C*o
lowering KLa but increasing C*o
increasing KLa and increasing Co
lowering KLa and lowering Co
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
The Intermig impeller is
an axial flow impeller which can be used for the culture of aerobic organisms
directed upwards rather than towards the base of the reactor
a fork shaped extensions to the impeller facilitate bubble break up
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
Main reason for using baffles in stirred tank reactors are
baffles permit turbulence conditions to arise at low stirrer speed
baffles will allow axial mixing to occur even with radial flow impellers
both (a) and (b)
baffles prevent turbulent conditions in stirred tank reactors
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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