Discussion
Home ‣ Biochemical Engineering ‣ Sterilization Comments
- Question
In sterilization process, spore of which of the following organism is considered as control?
Options- A. Bacillus subtilis
- B. Clostridium botulinum
- C. Bacillus stearothermophilus
- D. Aspergillus niger
- Correct Answer
- Bacillus stearothermophilus
- 1. The X90 value for a filtration system is
Options- A. the time required to reduce microbial population by 90%
- B. the time required to traverse survivor curve by one log cycle.
- C. the depth required to reduce population by 90%
- D. the depth of the filter required to reduce population by 99% Discuss
- 2. The highest temperature which appears to be feasible for batch sterilization is
Options- A. 121°C
- B. 100°C
- C. 105°C
- D. 130°C Discuss
- 3. Sterilization can be carried out by
Options- A. heat
- B. radiation
- C. chemical agents
- D. all of these Discuss
- 4. For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is
Options- A. 0.5
- B. 0.75
- C. 0.87
- D. 0.37 Discuss
- 5. The destruction of microorganisms by steam may be described as
Options- A. first order chemical reaction
- B. zero order chemical reaction
- C. second order chemical reaction
- D. none of these Discuss
- 6. The collection efficiency by diffusion increases with
Options- A. decreasing particle size
- B. decreasing air velocity
- C. both (a) and (b)
- D. increasing particle size Discuss
- 7. Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where NSt is the Stokes number)
Options- A. ?imp = 0.075NSt1.2
- B. ?imp = 0.75NSt1.2
- C. ?imp = 0.25NSt1.2
- D. ?imp = 0.025NSt1.2 Discuss
- 8. The K used in the equation for X10=2.303/K depends upon
Options- A. nature of the filter material
- B. linear velocity of the air passing through filter
- C. both (a) and (b)
- D. thickness of the filter Discuss
- 9. The reduction of number of cells from 1010 to one will result into the del factor (?) of
Options- A. 1
- B. 10
- C. 23
- D. 103 Discuss
- 10. If the packing density (?) 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)
Options- A. V = V0/(1-?)
- B. V-V0 = 1 - ?
- C. V = V0(1 - ?)
- D. V = V0/(1 + ?) Discuss
Sterilization problems
Search Results
Correct Answer: the depth required to reduce population by 90%
Correct Answer: 121°C
Correct Answer: all of these
Correct Answer: 0.5
Correct Answer: first order chemical reaction
Correct Answer: both (a) and (b)
Correct Answer: ?imp = 0.075NSt1.2
Correct Answer: both (a) and (b)
Correct Answer: 23
Correct Answer: V = V0/(1-?)
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