Sterilization(Engineering > Biochemical Engineering ) Questions and Answers

Question 1. The filter material used for air filtration system is/are
  1.    glass wool
  2.    glass fibre
  3.    norite
  4.    all of the above
Explanation:-
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 2. The overall del factor (Δ) may be represented as
  1.    Δoverall = Δheating + Δholding- Δcooling
  2.    Δoverall = Δheating + Δholding+ Δcooling
  3.    Δoverall = Δheating - Δholding+ Δcooling
  4.    Δoverall = Δheating - Δholding- Δcooling
Explanation:-
Answer: Option B. -> Δoverall = Δheating + Δholding+ Δcooling
Answer: (b).Δoverall = Δheating + Δholding+ Δcooling
Question 3. Glass fibers are favorable as a filter medium because they give a
  1.    lower pressure drop and are less liable to wetting or combustion
  2.    more pressure drop and are less liable to wetting or combustion
  3.    lower pressure drop and are more liable to wetting or combustion
  4.    more pressure drop and are more liable to wetting or combustion
Explanation:-
Answer: Option A. -> lower pressure drop and are less liable to wetting or combustion
Answer: (a).lower pressure drop and are less liable to wetting or combustion
Question 4. The collection efficiency by diffusion increases with
  1.    decreasing particle size
  2.    decreasing air velocity
  3.    both (a) and (b)
  4.    increasing particle size
Explanation:-
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
Question 5. The deviation from ideal plug flow due to axial mixing can be described by the
  1.    dispersion model
  2.    Langmuir model
  3.    Friedlander model
  4.    Pasceri model
Explanation:-
Answer: Option A. -> dispersion model
Answer: (a).dispersion model
Question 6. The destruction of microorganisms by steam may be described as
  1.    first order chemical reaction
  2.    zero order chemical reaction
  3.    second order chemical reaction
  4.    none of these
Explanation:-
Answer: Option A. -> first order chemical reaction
Answer: (a).first order chemical reaction
Question 7. The collection efficiency by interception increases with the
  1.    increasing particle diameter
  2.    increasing air flow velocity
  3.    both (a) and (b)
  4.    increasing particle size
Explanation:-
Answer: Option D. -> increasing particle size
Answer: (d).increasing particle size
Question 8. If the packing density (α) is defined as the volume of the fiber unit volume of filter bed, the velocity within the filter void space is equal to (where V is velocity in fluid void space and V0 is undisturbed fluid velocity)
  1.    V = V0/(1-α)
  2.    V-V0 = 1 - α
  3.    V = V0(1 - α)
  4.    V = V0/(1 + α)
Explanation:-
Answer: Option A. -> V = V0/(1-α)
Answer: (a).V = V0/(1-α)
Question 9. For indirect heating, the plate and frame heat exchanger is generally more effective than the shell and tube heat transfer due to its
  1.    larger heat transfer area
  2.    smaller heat transfer area
  3.    lesser cost
  4.    more number of plates
Explanation:-
Answer: Option A. -> larger heat transfer area
Answer: (a).larger heat transfer area
Question 10. The mechanism of air filtration in fibrous filter is
  1.    electrostatic attraction
  2.    impaction
  3.    interception
  4.    all of these
Explanation:-
Answer: Option D. -> all of these
Answer: (d).all of these
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