Fluid Flow – Section 1

16. The viscous nature of a non-Newtonian fluid

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

Correct Answer: B. changes with the level of power input and/or the length of time during which the fluid is mixed

17. Which of the following compound, if added to a solution will lead to the greatest increase in viscosity?

A. A globular protein
B. Glucose
C. A long chain protein such as albumin
D. Water

Correct Answer: C. A long chain protein such as albumin

18. A Brookfield viscometer measures viscosity by determining

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

Correct Answer: D. the torque required to move an impeller at a set speed

19. Which of the following factors will affect the sensitivity of animal cells to shear conditions?

A. Cell size
B. Availability of nutrients in the medium
C. The presence of shear protectorates in the medium
D. All of the above

Correct Answer: D. All of the above

20. The best-described action of Pluronic F68 (non-ionic detergent) in a cell culture medium is that, it

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

Correct Answer: A. acts on the surface properties of the cells and the culture medium

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