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Biochemical Engineering - Sterilization

Exercise : Sterilization - Section 1
  • Sterilization - Section 1
21.
Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where NSt is the Stokes number)
ηimp = 0.075NSt1.2
ηimp = 0.75NSt1.2
ηimp = 0.25NSt1.2
ηimp = 0.025NSt1.2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
The collection efficiency by impaction increases with
increasing particle diameter
increasing air flow velocity
both (a) and (b)
increasing particle size
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
The efficiency of fibrous filter by combined mechanism is given by(where ηimp,ηint,ηdif are the efficiencies by impaction, interception and diffusion respectively)
1 - ηimpηintηdif
1 - (1 - ηimp)(1 - ηint)( 1 - ηdif)
1 - ( ηimpηint/ηdif)
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
The heat conduction in dry air is
less rapid than in steam
more rapid than in steam
similar to steam
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is
0.5
0.75
0.87
0.37
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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