Exercise: Fluid Flow

Questions for: Fluid Flow

Bubble free aeration systems requires
A:
silicone tubing or gas permeable membranes to facilitate gas transfer
B:
carbon dioxide instead of air to supply oxygen
C:
silicone tubing or gas permeable membranes to remove carbon dioxide by oxygen in the form of hydrogen peroxide
D:
filled headspace of the reactor with carbon dioxide
Answer: A
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The viscosity of water at STP is approximately
A:
0.005 kg.m-1.s-1
B:
0.001 kg.m-1.s-1
C:
0.003 kg.m-2.s-1
D:
0.1 g.cm-1.s-1
Answer: B
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Filamentous fungal cells are more shear sensitive than bacterial cells because of
A:
the presence of citin in cell walls of filamentous fungi
B:
larger in size than bacterial cells and therefore are more susceptible to shear forces
C:
fungal cells are much larger than bacterial cells
D:
all of the above
Answer: D
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A fluid in which the viscosity decreases with increasing stirrer speed and mixing time, can be represented as
A:
newtonian fluid
B:
pseudoplastic, thixotropic fluid
C:
dilatant, rheopectic fluid
D:
dilatant, pseudoplastic fluid
Answer: B
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Which of the following describes the detrimental effect of bubbles on animal cells?
A:
Cells trapped on the surface of bubbles can be damaged when the bubbles explode, releasing their pressure and surface energies
B:
Cells trapped in the moving foam can be dragged apart by the bubbles
C:
Both (a) and (b)
D:
Bubbles can explode in the liquid medium causing the release of ultraviolet radiation
Answer: C
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