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Biochemical Engineering
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Sterilization
Comments
Question
The deviation from ideal plug flow due to axial mixing can be described by the
Options
A. dispersion model
B. Langmuir model
C. Friedlander model
D. Pasceri model
Correct Answer
dispersion model
Sterilization problems
Search Results
1. For the turbulent flow, the dispersion coefficient is correlated as a function of
Options
A. Reynolds number
B. Sherwood number
C. Schmidt number
D. Grashof number
Show Answer
Scratch Pad
Discuss
Correct Answer: Reynolds number
2. If the packing density (?) is defined as the volume of the fiber unit volume of filter bed, the velocity within the filter void space is equal to (where
V
is velocity in fluid void space and
V
0
is undisturbed fluid velocity)
Options
A.
V
=
V
0
/(1-?)
B.
V-V
0
= 1 - ?
C.
V
=
V
0
(1 - ?)
D.
V
=
V
0
/(1 + ?)
Show Answer
Scratch Pad
Discuss
Correct Answer:
V
=
V
0
/(1-?)
3. The reduction of number of cells from 10
10
to one will result into the del factor (?) of
Options
A. 1
B. 10
C. 23
D. 10
3
Show Answer
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Discuss
Correct Answer: 23
4. The K used in the equation for
X
10
=2.303/K depends upon
Options
A. nature of the filter material
B. linear velocity of the air passing through filter
C. both (a) and (b)
D. thickness of the filter
Show Answer
Scratch Pad
Discuss
Correct Answer: both (a) and (b)
5. Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where
N
St
is the Stokes number)
Options
A. ?
imp
= 0.075
N
St
1.2
B. ?
imp
= 0.75
N
St
1.2
C. ?
imp
= 0.25
N
St
1.2
D. ?
imp
= 0.025
N
St
1.2
Show Answer
Scratch Pad
Discuss
Correct Answer: ?
imp
= 0.075
N
St
1.2
6. The del factor (?) increases as the final number of cells
Options
A. decreases
B. increases
C. zero
D. constant
Show Answer
Scratch Pad
Discuss
Correct Answer: decreases
7. For indirect heating, the plate and frame heat exchanger is generally more effective than the shell and tube heat transfer due to its
Options
A. larger heat transfer area
B. smaller heat transfer area
C. lesser cost
D. more number of plates
Show Answer
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Discuss
Correct Answer: larger heat transfer area
8. The overall del factor (?) may be represented as
Options
A. ?
overall
= ?
heating
+ ?
holding
- ?
cooling
B. ?
overall
= ?
heating
+ ?
holding
+ ?
cooling
C. ?
overall
= ?
heating
- ?
holding
+ ?
cooling
D. ?
overall
= ?
heating
- ?
holding
- ?
cooling
Show Answer
Scratch Pad
Discuss
Correct Answer: ?
overall
= ?
heating
+ ?
holding
+ ?
cooling
9. Typical aeration rates for aerobic fermentation are
Options
A. 0 - 0.5 vvm
B. 0.5 - 1.0 vvm
C. 1.0 - 1.5 vvm
D. 1.5 - 2.0 vvm
Show Answer
Scratch Pad
Discuss
Correct Answer: 0.5 - 1.0 vvm
10. The typical size of particles collected by diffusion mechanism is
Options
A. <0.25?m
B. <0.5?m
C. <0.75?m
D. <1?m
Show Answer
Scratch Pad
Discuss
Correct Answer: <0.5?m
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More in Biochemical Engineering:
Agitation and Aeration
Downstream Processing
Enzymes and Application
Enzymes and Kinetics
Fermentation Kinetics
Fermentation Reactors
Fluid Flow
Immobilized Enzyme
Sterilization
Water Treatment