Questions and answers for exam Preparation

MCQs

Total Questions : 73 | Page 1 of 8 pages

Question 1. The filter material used for air filtration system is/are

glass wool
glass fibre
norite
all of the above

Discuss Question

Answer: Option D. -> all of the above
Answer: (d).all of the above

Question 2. The overall del factor (Δ) may be represented as

Δoverall = Δheating + Δholding- Δcooling
Δoverall = Δheating + Δholding+ Δcooling
Δoverall = Δheating - Δholding+ Δcooling
Δoverall = Δheating - Δholding- Δcooling

Discuss Question

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

lower pressure drop and are less liable to wetting or combustion
more pressure drop and are less liable to wetting or combustion
lower pressure drop and are more liable to wetting or combustion
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
Answer: (a).lower pressure drop and are less liable to wetting or combustion

Question 4. The collection efficiency by diffusion increases with

decreasing particle size
decreasing air velocity
both (a) and (b)
increasing particle size

Discuss Question

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

dispersion model
Langmuir model
Friedlander model
Pasceri model

Discuss Question

Answer: Option A. -> dispersion model
Answer: (a).dispersion model

Question 6. The destruction of microorganisms by steam may be described as

first order chemical reaction
zero order chemical reaction
second order chemical reaction
none of these

Discuss Question

Answer: Option A. -> first order chemical reaction
Answer: (a).first order chemical reaction

Question 7. The collection efficiency by interception increases with the

increasing particle diameter
increasing air flow velocity
both (a) and (b)
increasing particle size

Discuss Question

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)