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Home
‣
Biochemical Engineering
‣
Sterilization
Comments
Question
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
Correct Answer
both (a) and (b)
Sterilization problems
Search Results
1. 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
Scratch Pad
Discuss
Correct Answer:
Bacillus stearothermophilus
2. 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%
Show Answer
Scratch Pad
Discuss
Correct Answer: the depth required to reduce population by 90%
3. 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
Scratch Pad
Discuss
Correct Answer: 121°C
4. Sterilization can be carried out by
Options
A. heat
B. radiation
C. chemical agents
D. all of these
Show Answer
Scratch Pad
Discuss
Correct Answer: all of these
5. 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
Scratch Pad
Discuss
Correct Answer: 0.5
6. 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
7. 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)
8. 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
Scratch Pad
Discuss
Correct Answer: 23
9. 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-?)
10. 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
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