Fluid Flow problems
- 1. If the viscosity of a fluid decreases with increasing stirrer speed, then the nature of the fluid is
Options- A. newtonian
- B. pseudoplastic
- C. dilatant
- D. thixotropic Discuss
Correct Answer: pseudoplastic
- 2. Pluronic F68 is added to cell culture media as
Options- A. a nutrient
- B. a shear protectorant
- C. to increase oxygen transfer rates
- D. all of these Discuss
Correct Answer: a shear protectorant
- 3. Which of the following affect the Kolmogorov eddy size?
Options- A. Stirrer speed
- B. Physical properties of the liquid
- C. Size and type of impeller
- D. All of these Discuss
Correct Answer: All of these
- 4. The best described action of Pluronic F68 (non-ionic detergent) in a cell culture medium is that, it
Options- A. acts on the surface properties of the cells and the culture medium
- B. provides nutrients for the cells
- C. acts as a flocculant
- D. acts as a coagulant Discuss
Correct Answer: acts on the surface properties of the cells and the culture medium
- 5. A fluid in which the viscosity increases with increasing stirrer speed and mixing time can be called as
Options- A. newtonian fluid
- B. pseudoplastic, thixotropic fluid
- C. dilatant, rheopectic fluid
- D. dilatant pseudoplastic fluid Discuss
Correct Answer: dilatant, rheopectic fluid
- 6. A rheopectic 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
Correct Answer: increases with mixing time
- 7. The viscous nature of a non-Newtonian fluid
Options- A. remains constant with time and power input
- B. changes with the level of power input and/or the length of time during which the fluid is mixed
- C. is similar to that of a perfect gas
- D. is similar to that of water Discuss
Correct Answer: changes with the level of power input and/or the length of time during which the fluid is mixed
- 8. 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
Correct Answer: 5 x 105
- 9. 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
Correct Answer: remains constant with time and power input
- 10. 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
Correct Answer: the shear stress is not defined
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