Discussion
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- Question
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
- Correct Answer
- <0.5?m
- 1. 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
- 2. 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
- 3. 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
- 4. The del factor (?) increases as the final number of cells
Options- A. decreases
- B. increases
- C. zero
- D. constant Discuss
- 5. 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
- 6. 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
- 7. The mechanism of air filtration in fibrous filter is
Options- A. electrostatic attraction
- B. impaction
- C. interception
- D. all of these Discuss
- 8. Glass fibers are favorable as a filter medium because they give a
Options- A. lower pressure drop and are less liable to wetting or combustion
- B. more pressure drop and are less liable to wetting or combustion
- C. lower pressure drop and are more liable to wetting or combustion
- D. more pressure drop and are more liable to wetting or combustion Discuss
- 9. The mechanical means of accomplishing sterilization of fermentation media/equipment is
Options- A. ultrasonic
- B. radiation
- C. chemical agents
- D. none of these Discuss
- 10. The interception efficiency can be expressed as (where dp is the particle diameter and Dc cylindrical collection diameter)
Options- A. dp/Dc
- B. dp x Dc
- C. dp/Dc x 100
- D. dpDc/100 Discuss
Sterilization problems
Search Results
Correct Answer: 0.5 - 1.0 vvm
Correct Answer: ?overall = ?heating + ?holding+ ?cooling
Correct Answer: larger heat transfer area
Correct Answer: decreases
Correct Answer: dispersion model
Correct Answer: Jn = -D dcn/dx
Correct Answer: all of these
Correct Answer: lower pressure drop and are less liable to wetting or combustion
Correct Answer: ultrasonic
Correct Answer: dp/Dc
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