Exercise: Agitation And Aeration

Questions for: Agitation And Aeration

In the design of a paddle agitator, the ratio of paddle diameter to tank diameter is normally taken as
A:
0.1
B:
0.8
C:
0.25
D:
0.5
Answer: B
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What is/are the major difference(s) between disc and turbine type stirrer?
A:
Blades in disc type are projected out beyond the edge of disc while blades are curved one in turbine type
B:
Turbine type requires 50 % less air than disc type for the same yield and energy consumption
C:
Both (a) and (b)
D:
Number of blades in the stirrer
Answer: C
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To increase the oxygen transfer rate in a shake flask culture system, which of the following (s) is/are followed?
A:
Liquid volume in the flask is reduced
B:
Stirrer speed is increased
C:
Baffled flasks are used
D:
All of the above
Answer: D
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Impeller damage can be minimized by
A:
using specially designed axial flow impellers
B:
using radial flow impellers
C:
using Intermig impellers
D:
all of the above
Answer: A
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In the bubble boundary layer, oxygen concentration can be determined by measuring
A:
the steady state oxygen concentration in a mixed aerated reactor before inoculation
B:
the steady state oxygen concentration in a mixed aerated reactor after inoculation
C:
the steady state oxygen concentration in the boundary layer using a micro-probe
D:
volume of oxygen supplied
Answer: A
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