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- Question
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
- Correct Answer
- Reynolds number
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. The del factor (?) increases as the final number of cells
Options- A. decreases
- B. increases
- C. zero
- D. constant Discuss
- 8. 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
- 9. 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
- 10. 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
Sterilization problems
Search Results
Correct Answer: V = V0/(1-?)
Correct Answer: 23
Correct Answer: both (a) and (b)
Correct Answer: ?imp = 0.075NSt1.2
Correct Answer: both (a) and (b)
Correct Answer: dispersion model
Correct Answer: decreases
Correct Answer: larger heat transfer area
Correct Answer: ?overall = ?heating + ?holding+ ?cooling
Correct Answer: 0.5 - 1.0 vvm
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