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‣
Biochemical Engineering
‣
Sterilization
Comments
Question
The mechanical means of accomplishing sterilization of fermentation media/equipment is
Options
A. ultrasonic
B. radiation
C. chemical agents
D. none of these
Correct Answer
ultrasonic
Sterilization problems
Search Results
1. Glass fibers are favorable as a filter medium because they give a
Options
A. lower pressure drop and are less liable to wetting or combustion
B. more pressure drop and are less liable to wetting or combustion
C. lower pressure drop and are more liable to wetting or combustion
D. more pressure drop and are more liable to wetting or combustion
Show Answer
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Discuss
Correct Answer: lower pressure drop and are less liable to wetting or combustion
2. The mechanism of air filtration in fibrous filter is
Options
A. electrostatic attraction
B. impaction
C. interception
D. all of these
Show Answer
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Discuss
Correct Answer: all of these
3. Analogus to the molecular diffusion, the x-directional flux of microorganisms suspended in a medium due to the axial mixing can be represented as (where
J
n
is flux component '
n
',
c
n
is concentration of'
n
')
Options
A.
J
n
= -
dc
n
/
dx
B.
J
n
=
dc
n
/
dx
C.
J
n
= -
D dc
n
/
dx
D.
J
n
=
D dc
n
/
dx
Show Answer
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Discuss
Correct Answer:
J
n
= -
D dc
n
/
dx
4. 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
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Discuss
Correct Answer: <0.5?m
5. 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
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Correct Answer: 0.5 - 1.0 vvm
6. The interception efficiency can be expressed as (where
d
p
is the particle diameter and
D
c
cylindrical collection diameter)
Options
A.
d
p
/
D
c
B.
d
p
x
D
c
C.
d
p
/
D
c
x 100
D.
d
p
D
c
/100
Show Answer
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Correct Answer:
d
p
/
D
c
7. The filter material used for air filtration system is/are
Options
A. glass wool
B. glass fibre
C. norite
D. all of the above
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Correct Answer: all of the above
8. The sterilization method depends
Options
A. nature of additive
B. volume and feed rate
C. both (a) and (b)
D. none of these
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Discuss
Correct Answer: both (a) and (b)
9. Secondary treatment uses __________ to consume wastes.
Options
A. micro-organisms
B. chemicals
C. filtration
D. none of these
Show Answer
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Discuss
Correct Answer: micro-organisms
10. The activated sludge process consists of returning a portion of the clarifier
Options
A. effluent water entering the reactor
B. influent water coming out of the reactor
C. influent water entering the reactor
D. effluent water coming out of the reactor
Show Answer
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Correct Answer: influent water entering the reactor
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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