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Fluid Flow problems


  • 1. A thixotropic 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
  • 2. 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
  • Discuss
  • 3. 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
  • Discuss
  • 4. 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
  • Discuss
  • 5. 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
  • Discuss
  • 6. 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
  • Discuss
  • 7. Which of the following can act as a shear protectorant?

  • Options
  • A. Serum
  • B. Silicone oil
  • C. Glucose
  • D. Glutamic acid
  • Discuss

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