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  • Question
  • 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

  • Correct Answer
  • is constant regardless of the stirrer speed or mixing time 


  • Fluid Flow problems


    Search Results


    • 1. Water is a

    • Options
    • A. newtonian fluid
    • B. pseudoplastic
    • C. dilatant
    • D. rheopectic
    • Discuss
    • 2. 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
    • 3. The Monod Model relates

    • Options
    • A. substrate utilized with the biomass consumption
    • B. specific growth rate to the substrate availability
    • C. yield with the biomass utilization
    • D. the biomass concentration with specific growth rate
    • Discuss
    • 4. The function of a mechanical seal is to

    • Options
    • A. prevent contaminants entering the reactor
    • B. prevent cells from leaving the reactor
    • C. both (a) and (b)
    • D. prevent air to enter
    • Discuss
    • 5. During the exponential phase the maximum specific growth rate equals specific growth rate as

    • Options
    • A. concentration of the growth limiting substrate is much less than the monod constant
    • B. concentration of growth limiting substrate is much greater than the monod constant
    • C. specific growth rate increases exponentially
    • D. concentration of the growth limiting substrate is equal to the monod constant
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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