Discussion
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- Question
Which pattern of mixing is preferred in stirred tank reactors during the culture of aerobic microorganisms?
Options- A. Laminar flow
- B. Transient flow
- C. turbulent flow
- D. all of these
- Correct Answer
- turbulent flow
- 1. Non-linear relationship between shear stress and shear rate exists in
Options- A. newtonian fluids
- B. non-newtonian fluids
- C. both (a) and (b)
- D. none of these Discuss
- 2. The viscosity of liquid was classified as both dilatant and rheopectic, which means that the viscosity
Options- A. increased with stirring speed but decreased with mixing time
- B. increased with stirring speed and increased with mixing time
- C. decreased with stirring speed but increased with mixing time
- D. decreased with stirring speed and decreased with mixing time Discuss
- 3. A Brookfield viscometer cannot determine the shear stress because
Options- A. the shear stress is not defined
- B. a computer is required
- C. the impeller type is given only by numbers
- D. all of the above Discuss
- 4. Newtonian fluid is one in which the viscosity
Options- A. remains constant with time and power input
- B. increases with the level of power input
- C. decreases with the level of power input
- D. drastically increases with the level of power input Discuss
- 5. Reynolds number for laminar flow over a plate should be less than
Options- A. 500 mm
- B. 5 x 10-5
- C. 5 x 105
- D. 5 m Discuss
- 6. The Komologorov eddy size
Options- A. is constant at all stirrer speeds
- B. increases with stirrer speed
- C. decreases with stirrer speed
- D. becomes zero when the stirrer speed is very low Discuss
- 7. Animal cell cultures do not have much effect on shear forces because
Options- A. the cell size is generally smaller than the critical eddy size at which shear will have an effect
- B. cells are larger than the critical eddy size at which shear will have an effect
- C. animal cells have cell walls
- D. animal cells have cell membranes Discuss
- 8. Reynolds number for turbulent flow over a plate should be more than
Options- A. 5 x 10-5
- B. 106
- C. 5 x 105
- D. 500 Discuss
- 9. The viscosity of the culture fluid is classified as both pseudoplastic and thixotropic which indicates that the viscosity
Options- A. increases with stirring speed but decreases with mixing time
- B. increases with stirring speed and increases with mixing time
- C. decreases with stirring speed but increases with mixing time
- D. decreases with stirring speed and decreases with mixing time Discuss
- 10. The viscosity of a fluid increases with increasing stirrer speed. This fluid would be best described as being
Options- A. newtonian
- B. pseudoplastic
- C. dilatant
- D. thixotropic Discuss
Fluid Flow problems
Search Results
Correct Answer: non-newtonian fluids
Correct Answer: increased with stirring speed and increased with mixing time
Correct Answer: the shear stress is not defined
Correct Answer: remains constant with time and power input
Correct Answer: 5 x 105
Correct Answer: decreases with stirrer speed
Correct Answer: the cell size is generally smaller than the critical eddy size at which shear will have an effect
Correct Answer: 106
Correct Answer: decreases with stirring speed and decreases with mixing time
Correct Answer: dilatant
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