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  • Question
  • A liquid is flowing at 11,400 l.h-1 along a pipeline having a diameter of 4 cm. If the liquid has a density of 1 g.ml-1 and viscosity of 0.001kg.m-1.s-1, then the liquid would be in the


  • Options
  • A. laminar phase
  • B. transient phase
  • C. turbulent phase
  • D. any of the phase

  • Correct Answer
  • turbulent phase 


  • Fluid Flow problems


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    • 1. The viscosity of a fluid changes with either stirrer speed or mixing time. But when mixing ceases, the viscosity returns to its original state. This fluid is best described as

    • Options
    • A. newtonian
    • B. rheopectic
    • C. viscoelastic
    • D. thixotropic
    • Discuss
    • 2. The medium will have the highest viscosity (considering that the cells do not secrete gums) with the presence of

    • Options
    • A. single celled bacteria
    • B. filamentous fungi that form pellets
    • C. filamentous fungi that grow as long poorly branched chains
    • D. yeast
    • Discuss
    • 3. A pseudoplastic 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
    • 4. 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
    • 5. 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
    • 6. Bubble free aeration systems requires

    • Options
    • A. silicone tubing or gas permeable membranes to facilitate gas transfer
    • B. carbon dioxide instead of air to supply oxygen
    • C. silicone tubing or gas permeable membranes to remove carbon dioxide by oxygen in the form of hydrogen peroxide
    • D. filled headspace of the reactor with carbon dioxide
    • Discuss
    • 7. If the viscosity of a fluid decreases with the length of time that it is being mixed, then this fluid is

    • Options
    • A. newtonian
    • B. rheopectic
    • C. viscoelastic
    • D. thixotropic
    • Discuss
    • 8. A viscoelastic 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
    • 9. Which of the following is correct?

    • Options
    • A. The viscosity of liquids and gases decrease with increasing temperature
    • B. The viscosity of liquids and gases increase with increasing temperature
    • C. the viscosity of gases increases with increasing temperature, but decreases in liquids
    • D. the viscosity of gases decreases with increasing temperature, but decreases in liquids.
    • Discuss
    • 10. Pluronic F68 protects mammalian cells from damage stems as it is a/an

    • Options
    • A. surface active agent which stabilizes foams
    • B. surface active agent which destabilizes foams
    • C. excellent source of vitamins
    • D. coagulant
    • Discuss


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