Questions and answers for exam Preparation

MCQs

Total Questions : 62 | Page 6 of 7 pages

Question 51. . For cost analysis in a fermentor system, the depreciation cost varies from

5-6% of the capital cost
6-7% of the capital cost
6-10% of the capital cost
8-10% of the capital cost

Discuss Question

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

Question 52. . Micro filtration refers to the separation of suspended material such as bacteria by using a membrane with spore sizes of

0.02 to 10μm
1-10A°
20-30μm
10-200A°

Discuss Question

Answer: Option A. -> 0.02 to 10μm

Question 53. . Start up expenses in a fermentation industry varies from

0-5% of the capital cost
10-15% of the capital cost
5-10% of the capital cost
15-20% of the capital cost

Discuss Question

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

Question 54. . 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)

J = Lp(Δp - σΔπ)
J/A = Lp(Δp - σΔπ)
J = Lp/σΔπ
J/A = Lp/Δp

Discuss Question

Answer: Option A. -> J = Lp(Δp - σΔπ)

Question 55. . Which of the following is considered as a pretreatment to the biological feeds?

Heating to denature the proteins
Addition of filter aids to increase the porosity
Addition of electrolytes
All of the above

Discuss Question

Answer: Option D. -> All of the above

Question 56. . For the extractions operation, the selectivity should be

> 1
< 1
1
zero

Discuss Question

Answer: Option A. -> > 1

Question 57. . The purity of a solute collected between two times t1 and t2 during chromatographic separation can be calculated as

amount of solute eluted - amount of impurity eluted
amount of solute eluted / amount of impurity eluted
amount of solvent eluted + amount of impurity eluted
amount of solvent eluted / amount of impurity eluted

Discuss Question

Answer: Option B. -> amount of solute eluted / amount of impurity eluted

Question 58. . Chromatography is based on the

different rate of movement of the solute in the column
separation of one solute from other constituents by being captured on the adsorbent
different rate of movement of the solvent in the column
any of the above

Discuss Question

Answer: Option A. -> different rate of movement of the solute in the column

Question 59. .
The correlation often employed to correlate adsorption data for protein is (where Ymax is the maximum amount of solute adsorbed per mass of adsorbent, X is the mass fraction of solute in the diluent phase in solute-free basis, KL is a constant and Y is the equilibrium value of the mass of solute adsorbed per mass of adsorbent)