Fluid Flow problems
- 1. 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
Correct Answer: increased with stirring speed and increased with mixing time
- 2. 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
Correct Answer: non-newtonian fluids
- 3. 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 Discuss
Correct Answer: turbulent flow
- 4. 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
Correct Answer: decreases with stirrer speed
- 5. 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
Correct Answer: the cell size is generally smaller than the critical eddy size at which shear will have an effect
- 6. 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
Correct Answer: 106
- 7. 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
Correct Answer: decreases with stirring speed and decreases with mixing time
- 8. 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
Correct Answer: dilatant
- 9. Filamentous fungal cells are more shear sensitive than bacterial cells because of
Options- A. the presence of citin in cell walls of filamentous fungi
- B. larger in size than bacterial cells and therefore are more susceptible to shear forces
- C. fungal cells are much larger than bacterial cells
- D. all of the above Discuss
Correct Answer: all of the above
- 10. The viscosity of water at STP is approximately
Options- A. 0.005 kg.m-1.s-1
- B. 0.001 kg.m-1.s-1
- C. 0.003 kg.m-2.s-1
- D. 0.1 g.cm-1.s-1 Discuss
Correct Answer: 0.001 kg.m-1.s-1
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