Sterilization problems
- 1. 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
Correct Answer: 23
- 2. 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
Correct Answer: V = V0/(1-?)
- 3. For the turbulent flow, the dispersion coefficient is correlated as a function of
Options- A. Reynolds number
- B. Sherwood number
- C. Schmidt number
- D. Grashof number Discuss
Correct Answer: Reynolds number
- 4. The deviation from ideal plug flow due to axial mixing can be described by the
Options- A. dispersion model
- B. Langmuir model
- C. Friedlander model
- D. Pasceri model Discuss
Correct Answer: dispersion model
- 5. The del factor (?) increases as the final number of cells
Options- A. decreases
- B. increases
- C. zero
- D. constant Discuss
Correct Answer: decreases
- 6. For indirect heating, the plate and frame heat exchanger is generally more effective than the shell and tube heat transfer due to its
Options- A. larger heat transfer area
- B. smaller heat transfer area
- C. lesser cost
- D. more number of plates Discuss
Correct Answer: larger heat transfer area
- 7. The overall del factor (?) may be represented as
Options- A. ?overall = ?heating + ?holding- ?cooling
- B. ?overall = ?heating + ?holding+ ?cooling
- C. ?overall = ?heating - ?holding+ ?cooling
- D. ?overall = ?heating - ?holding- ?cooling Discuss
Correct Answer: ?overall = ?heating + ?holding+ ?cooling
- 8. Typical aeration rates for aerobic fermentation are
Options- A. 0 - 0.5 vvm
- B. 0.5 - 1.0 vvm
- C. 1.0 - 1.5 vvm
- D. 1.5 - 2.0 vvm Discuss
Correct Answer: 0.5 - 1.0 vvm
- 9. The typical size of particles collected by diffusion mechanism is
Options- A. <0.25?m
- B. <0.5?m
- C. <0.75?m
- D. <1?m Discuss
Correct Answer: <0.5?m
- 10. Analogus to the molecular diffusion, the x-directional flux of microorganisms suspended in a medium due to the axial mixing can be represented as (where Jn is flux component 'n', cn is concentration of'n')
Options- A. Jn = -dcn/dx
- B. Jn = dcn/dx
- C. Jn = -D dcn/dx
- D. Jn = D dcn/dx Discuss
Correct Answer: Jn = -D dcn/dx
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