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MCQs

Total Questions : 62 | Page 4 of 7 pages
Question 31.  Concentration polarization can be reduced further by
  1.    pre filtering the solution
  2.    reducing the flow rate per unit membrane surface area
  3.    back washing periodically
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 32.  A system which require less solvent and produces a more concentrated extract phase, is desired with a
  1.    large distribution coefficients
  2.    small distribution coefficients
  3.    very small distribution coefficients
  4.    constant distribution coefficients
 Discuss Question
Answer: Option A. -> large distribution coefficients
Question 33.  The efficiency of cell disruption in a bead mill depends on the
  1.    concentration of the cells
  2.    amount and size of beads
  3.    type and rotational speed of agitation
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 34.  A common filter medium is the cloth filter generally made of
  1.    canvas
  2.    synthetic fabrics
  3.    metal or glass fiber
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 35.  Maintenance cost varies from
  1.    0-4% of the capital cost
  2.    12-16% of the capital cost
  3.    4-8% of the capital cost
  4.    8-12% of the capital cost
 Discuss Question
Answer: Option C. -> 4-8% of the capital cost
Question 36.  An ion exchange resin is composed of
  1.    polymeric network
  2.    ionic functional groups
  3.    counter ions
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 37.  The optimum wet solid content for the cell suspension for a bead mill is typically somewhere between
  1.    5-15% by volume
  2.    15-30% by volume
  3.    30-60% by volume
  4.    60-90% by volume
 Discuss Question
Answer: Option C. -> 30-60% by volume
Question 38.  
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)
  1.    (1/A) dVf/dt = Δp/μ(L/K)
  2.    dVf/dt = (1/A)Δp/μ(L/K)
  3.    (1/A) dVf/dt = Δp/μ LK
  4.    dVf/dt = (1/A)Δp/μ LK
 Discuss Question
Answer: Option A. -> (1/A) dVf/dt = Δp/μ(L/K)
Question 39.  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?
  1.    1.54 ft2
  2.    3.08 ft2
  3.    65 ft2
  4.    65 lbs/ ft2.hr
 Discuss Question
Answer: Option A. -> 1.54 ft2
Question 40. . Selectivity can be expressed as
  1.    ratio of the distribution coefficients in different solute
  2.    mass fraction of the solute in the extract phase at equilibrium
  3.    mass fraction of the solute in the raffinate phase
  4.    ratio of the mass fraction of the solute in the extract phase to the raffinate phase
 Discuss Question
Answer: Option A. -> ratio of the distribution coefficients in different solute

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