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Biochemical Engineering
‣
Downstream Processing
Comments
Question
The efficiency of cell disruption in a bead mill depends on the
Options
A. concentration of the cells
B. amount and size of beads
C. type and rotational speed of agitation
D. all of these
Correct Answer
all of these
Downstream Processing problems
Search Results
1. For the extractions operation, the selectivity should be
Options
A. > 1
B. < 1
C. 1
D. zero
Show Answer
Scratch Pad
Discuss
Correct Answer: > 1
2. For cost analysis in a fermentor system, the depreciation cost varies from
Options
A. 5-6% of the capital cost
B. 6-7% of the capital cost
C. 6-10% of the capital cost
D. 8-10% of the capital cost
Show Answer
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Discuss
Correct Answer: 6-10% of the capital cost
3. An ion exchange resin is composed of
Options
A. polymeric network
B. ionic functional groups
C. counter ions
D. all of these
Show Answer
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Discuss
Correct Answer: all of these
4. Which of the operation does not come under upstream processing?
Options
A. Media preparation
B. Inoculum development
C. Effluent treatment
D. Storage of raw material
Show Answer
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Discuss
Correct Answer: Effluent treatment
5. Filtration leaf test results indicate that the filtration rate of a protein product is 100 dry lbs/(ft
2
hr). What size production filter would be required to obtain 100 dry lbs of filter cake/hr?
Options
A. 1.54 ft
2
B. 3.08 ft
2
C. 65 ft
2
D. 65 lbs/ ft
2
.hr
Show Answer
Scratch Pad
Discuss
Correct Answer: 1.54 ft
2
6. Conventional adsorption is a
Options
A. reversible process
B. irreversible process
C. either reversible or irreversible
D. none of these
Show Answer
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Discuss
Correct Answer: reversible process
7. If the solute passes through membrane freely, the the rejection coefficient (s) is
Options
A. 1
B. 0
C. >1
D. <1
Show Answer
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Discuss
Correct Answer: 0
8. The conventional filtration involves the separation of large particles generally
Options
A.
d
p
>5?m
B.
d
p
>10?m
C.
d
p
>15?m
D.
d
p
>20?m
Show Answer
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Discuss
Correct Answer:
d
p
>10?m
9. Micro filtration refers to the separation of suspended material such as bacteria by using a membrane with spore sizes of
Options
A. 0.02 to 10?m
B. 1-10A°
C. 20-30?m
D. 10-200A°
Show Answer
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Discuss
Correct Answer: 0.02 to 10?m
10. Which of the following is considered as a pretreatment to the biological feeds?
Options
A. Heating to denature the proteins
B. Addition of filter aids to increase the porosity
C. Addition of electrolytes
D. All of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: All of the above
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Agitation and Aeration
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Enzymes and Application
Enzymes and Kinetics
Fermentation Kinetics
Fermentation Reactors
Fluid Flow
Immobilized Enzyme
Sterilization
Water Treatment