The viscosity of a fluid increases with the length of time that it is being mixe

CuriousTab

Home Aptitude

Question
The viscosity of a fluid increases with the length of time that it is being mixed. This fluid would be best described as being
Options
A. newtonian
B. rheopectic
C. viscoelastic
D. thixotropic

Correct Answer

rheopectic

1. Which of the following factors will affect the sensitivity of animal cells to shear conditions?
Options
A. Cell size
B. Availability of nutrients in the medium
C. The presence of shear protectorants in the medium
D. All of the above

4. 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

6. The approach which is commonly used to determine the level of damage to animal cells in a culture medium is to monitor
Options
A. the concentration of lactate in the medium
B. the level of lactate oxidase activity in the medium
C. the level of lactate dehydrogenase activity
D. the level of lactase activity in the medium

7. Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology?
Options
A. The Kolmogorov eddy size is a measure of the smallest eddy size in a liquid
B. When the Kolmogorov eddy size become equivalent or smaller than the cell or particle diameter, then the cell or particle will become susceptible to shear damage
C. At the Kolmogorov eddy size, much of the energy of the originating eddy will be released
D. All of the above

8. A stirred tank reactor containing a fluid with a density of 2.5 g.ml^-1 and viscosity of 0.002 kg m^-1s^-1 is mixed at 120 rpm. If the fluid is mixed with an impeller having diameter 50 cm, then the Reynolds number of the liquid in the reactor is
Options
A. 2500
B. 100
C. 12,50,000
D. 1,000,000

Comments