Downstream Processing(Engineering > Biochemical Engineering ) Questions and Answers

Question 1. For cost analysis in a fermentor system, the depreciation cost varies from
  1.    5-6% of the capital cost
  2.    6-7% of the capital cost
  3.    6-10% of the capital cost
  4.    8-10% of the capital cost
Explanation:-
Answer: Option C. -> 6-10% of the capital cost
Answer: (c).6-10% of the capital cost
Question 2. Start up expenses in a fermentation industry varies from
  1.    0-5% of the capital cost
  2.    10-15% of the capital cost
  3.    5-10% of the capital cost
  4.    15-20% of the capital cost
Explanation:-
Answer: Option C. -> 5-10% of the capital cost
Answer: (c).5-10% of the capital cost
Question 3. Which of the following is considered as a pretreatment to the biological feeds?
  1.    Heating to denature the proteins
  2.    Addition of filter aids to increase the porosity
  3.    Addition of electrolytes
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Answer: (d).All of the above
Question 4. 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)
  1.    J = Lp(Δp - σΔπ)
  2.    J/A = Lp(Δp - σΔπ)
  3.    J = Lp/σΔπ
  4.    J/A = Lp/Δp
Explanation:-
Answer: Option A. -> J = Lp(Δp - σΔπ)
Answer: (a).J = Lp(Δp - σΔπ)
Question 5. Micro filtration refers to the separation of suspended material such as bacteria by using a membrane with spore sizes of
  1.    0.02 to 10μm
  2.    1-10A°
  3.    20-30μm
  4.    10-200A°
Explanation:-
Answer: Option A. -> 0.02 to 10μm
Answer: (a).0.02 to 10μm
Question 6. The disk centrifuge is the type of centrifuge used most often for bio separations due to its
  1.    continuous operation
  2.    lesser cost
  3.    higher speed
  4.    ease in operation
Explanation:-
Answer: Option B. -> lesser cost
Answer: (b).lesser cost
Question 7. The stage wise operation of adsorption is called
  1.    contact filtration
  2.    conventional adsorption
  3.    affinity adsorption
  4.    ion exchange
Explanation:-
Answer: Option A. -> contact filtration
Answer: (a).contact filtration
Question 8. Conventional adsorption is a
  1.    reversible process
  2.    irreversible process
  3.    either reversible or irreversible
  4.    none of these
Explanation:-
Answer: Option A. -> reversible process
Answer: (a).reversible process
Question 9. Which of the following is not the physical method for the cells rupturing?
  1.    Milling
  2.    Homogenization
  3.    Ultrasonication
  4.    Enzymatic digestion
Explanation:-
Answer: Option D. -> Enzymatic digestion
Answer: (d).Enzymatic digestion
Question 10. The effectiveness of a solvent can be measured by the
  1.    distribution coefficients
  2.    selectivity
  3.    both (a) and (b)
  4.    diffusivity
Explanation:-
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
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