Fluid Flow problems
- 1. Which of the following describes the detrimental effect of bubbles on animal cells?
Options- A. Cells trapped on the surface of bubbles can be damaged when the bubbles explode, releasing their pressure and surface energies
- B. Cells trapped in the moving foam can be dragged apart by the bubbles
- C. Both (a) and (b)
- D. Bubbles can explode in the liquid medium causing the release of ultraviolet radiation Discuss
Correct Answer: Both (a) and (b)
- 2. Water is a
Options- A. newtonian fluid
- B. pseudoplastic
- C. dilatant
- D. rheopectic Discuss
Correct Answer: newtonian fluid
- 3. A Newtonian 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 increasing stirrer speed
- D. decreases with increasing stirrer speed Discuss
Correct Answer: is constant regardless of the stirrer speed or mixing time
- 4. A dilatant 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 increasing stirrer speed
- D. decreases with increasing stirrer speed Discuss
Correct Answer: increases with increasing stirrer speed
- 5. In animal cell bioreactor, bubble damage can be minimized by
Options- A. the addition of a shear protectorant
- B. using a bubble free oxygen delivery system
- C. headspace aeration
- D. all of the above Discuss
Correct Answer: all of the above
- 6. Which of the following compound, if added to a solution will lead to the greatest increase in viscosity?
Options- A. A globular protein
- B. Glucose
- C. A long chain protein such as albumin
- D. Water Discuss
Correct Answer: A long chain protein such as albumin
- 7. A fluid in which the viscosity decreases with increasing stirrer speed and mixing time, can be represented as
Options- A. newtonian fluid
- B. pseudoplastic, thixotropic fluid
- C. dilatant, rheopectic fluid
- D. dilatant, pseudoplastic fluid Discuss
Correct Answer: pseudoplastic, thixotropic fluid
- 8. A Brookfield viscometer measures viscosity by determining
Options- A. the shear stress
- B. the shear rate
- C. the shear stress and shear rate
- D. the torque required to move an impeller at a set speed Discuss
Correct Answer: the torque required to move an impeller at a set speed
- 9. In sparged mammalian cell bioreactors, the cell damage is caused because of
Options- A. shear stress arising during mixing of the cell culture fluid
- B. shear stresses arising from the breakup of bubbles at the liquid surface
- C. shear stresses between bubbles in foam at the liquid surface
- D. all of the above Discuss
Correct Answer: shear stress arising during mixing of the cell culture fluid
- 10. The SI unit for viscosity is
Options- A. kg.m-1.s-1
- B. kg.m-2.s-2
- C. kg.m-3.s-1
- D. kg.m-1.s-2 Discuss
Correct Answer: kg.m-1.s-1
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