Discussion
Home ‣ Biochemical Engineering ‣ Downstream Processing Comments
- Question
Assuming the laminar flow across the filter, the rate of filtration (dVf/dt) can be expressed as a function of pressure drop Dp by the modified D'Arcy's equation as (where A is the area of filtering surface, K is the D'Arcy's filter cake permeability and L is the thickness of the filter cake)
Options- A. (1/A) dVf/dt = ?p/?(L/K)
- B. dVf/dt = (1/A)?p/?(L/K)
- C. (1/A) dVf/dt = ?p/? LK
- D. dVf/dt = (1/A)?p/? LK
- Correct Answer
- (1/A) dVf/dt = ?p/?(L/K)
- 1. If the membrane rejects all solute, the rejection coefficient (s) is
Options- A. 1
- B. 0
- C. >1
- D. <1 Discuss
- 2. A system which require less solvent and produces a more concentrated extract phase, is desired with a
Options- A. large distribution coefficients
- B. small distribution coefficients
- C. very small distribution coefficients
- D. constant distribution coefficients Discuss
- 3. The effectiveness of a solvent can be measured by the
Options- A. distribution coefficients
- B. selectivity
- C. both (a) and (b)
- D. diffusivity Discuss
- 4. The optimum wet solid content for the cell suspension for a bead mill is typically somewhere between
Options- A. 5-15% by volume
- B. 15-30% by volume
- C. 30-60% by volume
- D. 60-90% by volume Discuss
- 5. Which of the following is not the physical method for the cells rupturing?
Options- A. Milling
- B. Homogenization
- C. Ultrasonication
- D. Enzymatic digestion Discuss
- 6. Filtration leaf test results indicate that the filtration rate of a protein product is 100 dry lbs/(ft2 hr). What size production filter would be required to obtain 100 dry lbs of filter cake/hr?
Options- A. 1.54 ft2
- B. 3.08 ft2
- C. 65 ft2
- D. 65 lbs/ ft2.hr Discuss
- 7. 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 Discuss
- 8. An ion exchange resin is composed of
Options- A. polymeric network
- B. ionic functional groups
- C. counter ions
- D. all of these Discuss
- 9. 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 Discuss
- 10. For the extractions operation, the selectivity should be
Options- A. > 1
- B. < 1
- C. 1
- D. zero Discuss
Downstream Processing problems
Search Results
Correct Answer: 1
Correct Answer: large distribution coefficients
Correct Answer: both (a) and (b)
Correct Answer: 30-60% by volume
Correct Answer: Enzymatic digestion
Correct Answer: 1.54 ft2
Correct Answer: Effluent treatment
Correct Answer: all of these
Correct Answer: 6-10% of the capital cost
Correct Answer: > 1
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