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- Question
A stirred tank reactor containing a fluid with a density of 2.5 g.ml-1 and viscosity of 0.002 kg m-1s-1 is mixed at 120 rpm. If the fluid is mixed with an impeller having diameter 50 cm, then the Reynolds number of the liquid in the reactor is
Options- A. 2500
- B. 100
- C. 12,50,000
- D. 1,000,000
- Correct Answer
- 12,50,000
- 1. Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology?
Options- A. The Kolmogorov eddy size is a measure of the smallest eddy size in a liquid
- B. When the Kolmogorov eddy size become equivalent or smaller than the cell or particle diameter, then the cell or particle will become susceptible to shear damage
- C. At the Kolmogorov eddy size, much of the energy of the originating eddy will be released
- D. All of the above Discuss
- 2. The approach which is commonly used to determine the level of damage to animal cells in a culture medium is to monitor
Options- A. the concentration of lactate in the medium
- B. the level of lactate oxidase activity in the medium
- C. the level of lactate dehydrogenase activity
- D. the level of lactase activity in the medium Discuss
- 3. The viscosity of a fluid increases with the length of time that it is being mixed. This fluid would be best described as being
Options- A. newtonian
- B. rheopectic
- C. viscoelastic
- D. thixotropic Discuss
- 4. Which of the following factors will affect the sensitivity of animal cells to shear conditions?
Options- A. Cell size
- B. Availability of nutrients in the medium
- C. The presence of shear protectorants in the medium
- D. All of the above Discuss
- 5. A thixotropic fluid is one in which the viscosity
Options- A. is constant regardless of the stirrer speed or mixing time
- B. changes during mixing but returns to its original state after mixing
- C. increases with mixing time
- D. decreases with mixing time Discuss
- 6. Which of the following can act as a shear protectorant?
Options- A. Serum
- B. Silicone oil
- C. Glucose
- D. Glutamic acid Discuss
- 7. In antibiotic manufacturing processes, the fermentation time ranges from
Options- A. 2-3 weeks
- B. 1-2 weeks
- C. 4-5 weeks
- D. 2-4 weeks Discuss
- 8. Chromatography is based on the
Options- A. different rate of movement of the solute in the column
- B. separation of one solute from other constituents by being captured on the adsorbent
- C. different rate of movement of the solvent in the column
- D. any of the above Discuss
- 9. A common filter medium is the cloth filter generally made of
Options- A. canvas
- B. synthetic fabrics
- C. metal or glass fiber
- D. all of these Discuss
- 10. Maintenance cost varies from
Options- A. 0-4% of the capital cost
- B. 12-16% of the capital cost
- C. 4-8% of the capital cost
- D. 8-12% of the capital cost Discuss
Fluid Flow problems
Search Results
Correct Answer: All of the above
Correct Answer: the level of lactate dehydrogenase activity
Correct Answer: rheopectic
Correct Answer: All of the above
Correct Answer: decreases with mixing time
Correct Answer: Serum
Correct Answer: 4-5 weeks
Correct Answer: different rate of movement of the solute in the column
Correct Answer: all of these
Correct Answer: 4-8% of the capital cost
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