Downstream Processing – Section 1

21. For cost analysis in a fermentor system, the depreciation cost varies from

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

Correct Answer: C. 6-10% of the capital cost

22. Microfiltration refers to the separation of suspended material such as bacteria by using a membrane with spore sizes of

A. 0.02 to 10μm
B. 1-10A°
C. 20-30μm
D. 10-200A°

Correct Answer: A. 0.02 to 10μm

23. Start up expenses in a fermentation industry varies from

A. 0-5% of the capital cost
B. 10-15% of the capital cost
C. 5-10% of the capital cost
D. 15-20% of the capital cost

Correct Answer: C. 5-10% of the capital cost

24. The solvent flux across the membrane can be expressed as (where A is the area, Lp is the membrane permeability, σ is the reflection point, Δp is applied pressure and Δπ is the osmotic pressure)

A. J = Lpp – σΔπ)
B. J/A = Lpp – σΔπ)
C. J = Lp /σΔπ
D. J/A = Lpp

Correct Answer: A. J = Lpp – σΔπ)

25. Which of the following is considered as a pretreatment to the biological feeds?

A. Heating to denature the proteins
B. Addition of filter aids to increase the porosity
C. Addition of electrolytes
D. All of the above

Correct Answer: D. All of the above

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