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Discussion
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Biochemical Engineering
‣
Sterilization
Comments
Question
The
X
90
value for a filtration system is
Options
A. the time required to reduce microbial population by 90%
B. the time required to traverse survivor curve by one log cycle.
C. the depth required to reduce population by 90%
D. the depth of the filter required to reduce population by 99%
Correct Answer
the depth required to reduce population by 90%
Sterilization problems
Search Results
1. The highest temperature which appears to be feasible for batch sterilization is
Options
A. 121°C
B. 100°C
C. 105°C
D. 130°C
Show Answer
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Discuss
Correct Answer: 121°C
2. Sterilization can be carried out by
Options
A. heat
B. radiation
C. chemical agents
D. all of these
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Discuss
Correct Answer: all of these
3. For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is
Options
A. 0.5
B. 0.75
C. 0.87
D. 0.37
Show Answer
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Discuss
Correct Answer: 0.5
4. The destruction of microorganisms by steam may be described as
Options
A. first order chemical reaction
B. zero order chemical reaction
C. second order chemical reaction
D. none of these
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Correct Answer: first order chemical reaction
5. The heat conduction in dry air is
Options
A. less rapid than in steam
B. more rapid than in steam
C. similar to steam
D. none of these
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Correct Answer: less rapid than in steam
6. In sterilization process, spore of which of the following organism is considered as control?
Options
A.
Bacillus subtilis
B.
Clostridium botulinum
C.
Bacillus stearothermophilus
D.
Aspergillus niger
Show Answer
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Correct Answer:
Bacillus stearothermophilus
7. The collection efficiency by diffusion increases with
Options
A. decreasing particle size
B. decreasing air velocity
C. both (a) and (b)
D. increasing particle size
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Correct Answer: both (a) and (b)
8. 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
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Correct Answer: ?
imp
= 0.075
N
St
1.2
9. 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
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Correct Answer: both (a) and (b)
10. 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
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Enzymes and Kinetics
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Fermentation Reactors
Fluid Flow
Immobilized Enzyme
Sterilization
Water Treatment