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MCQs

Total Questions : 73 | Page 5 of 8 pages
Question 41.  The del factor (Δ) increases as the final number of cells
  1.    decreases
  2.    increases
  3.    zero
  4.    constant
 Discuss Question
Answer: Option A. -> decreases
Question 42.  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
 Discuss Question
Answer: Option B. -> Δoverall = Δheating + Δholding+ Δcooling
Question 43.  The relationship between the del factor, temperature and time is given as
  1.    Δ = A.t. e-E/RT
  2.    Δ = 1/(A.t. e-E/RT)
  3.    Δ = A.t. eE/RT
  4.    Δ = A.t.T
 Discuss Question
Answer: Option A. -> Δ = A.t. e-E/RT
Question 44.  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
 Discuss Question
Answer: Option A. -> dispersion model
Question 45. . The mechanism of air filtration in fibrous filter is
  1.    electrostatic attraction
  2.    impaction
  3.    interception
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 46.  The collection efficiency by diffusion increases with
  1.    decreasing particle size
  2.    decreasing air velocity
  3.    both (a) and (b)
  4.    increasing particle size
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 47. . 
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
 Discuss Question
Answer: Option A. -> larger heat transfer area
Question 48. . 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
 Discuss Question
Answer: Option A. -> lower pressure drop and are less liable to wetting or combustion
Question 49. . 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
 Discuss Question
Answer: Option D. -> increasing particle size
Question 50. . 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)
 Discuss Question
Answer: Option A. -> V = V0/(1-α)

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