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Home Biochemical Engineering Fluid Flow Comments

  • Question
  • Non-linear relationship between shear stress and shear rate exists in


  • Options
  • A. newtonian fluids
  • B. non-newtonian fluids
  • C. both (a) and (b)
  • D. none of these

  • Correct Answer
  • non-newtonian fluids 


  • Fluid Flow problems


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    • 1. The viscosity of liquid was classified as both dilatant and rheopectic, which means that the viscosity

    • Options
    • A. increased with stirring speed but decreased with mixing time
    • B. increased with stirring speed and increased with mixing time
    • C. decreased with stirring speed but increased with mixing time
    • D. decreased with stirring speed and decreased with mixing time
    • Discuss
    • 2. A Brookfield viscometer cannot determine the shear stress because

    • Options
    • A. the shear stress is not defined
    • B. a computer is required
    • C. the impeller type is given only by numbers
    • D. all of the above
    • Discuss
    • 3. Newtonian fluid is one in which the viscosity

    • Options
    • A. remains constant with time and power input
    • B. increases with the level of power input
    • C. decreases with the level of power input
    • D. drastically increases with the level of power input
    • Discuss
    • 4. Reynolds number for laminar flow over a plate should be less than

    • Options
    • A. 500 mm
    • B. 5 x 10-5
    • C. 5 x 105
    • D. 5 m
    • Discuss
    • 5. The viscous nature of a non-Newtonian fluid

    • Options
    • 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
    • Discuss
    • 6. Which pattern of mixing is preferred in stirred tank reactors during the culture of aerobic microorganisms?

    • Options
    • A. Laminar flow
    • B. Transient flow
    • C. turbulent flow
    • D. all of these
    • Discuss
    • 7. The Komologorov eddy size

    • Options
    • A. is constant at all stirrer speeds
    • B. increases with stirrer speed
    • C. decreases with stirrer speed
    • D. becomes zero when the stirrer speed is very low
    • Discuss
    • 8. Animal cell cultures do not have much effect on shear forces because

    • Options
    • A. the cell size is generally smaller than the critical eddy size at which shear will have an effect
    • B. cells are larger than the critical eddy size at which shear will have an effect
    • C. animal cells have cell walls
    • D. animal cells have cell membranes
    • Discuss
    • 9. Reynolds number for turbulent flow over a plate should be more than

    • Options
    • A. 5 x 10-5
    • B. 106
    • C. 5 x 105
    • D. 500
    • Discuss
    • 10. The viscosity of the culture fluid is classified as both pseudoplastic and thixotropic which indicates that the viscosity

    • Options
    • A. increases with stirring speed but decreases with mixing time
    • B. increases with stirring speed and increases with mixing time
    • C. decreases with stirring speed but increases with mixing time
    • D. decreases with stirring speed and decreases with mixing time
    • Discuss


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