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Home Biochemical Engineering Sterilization Comments

  • Question
  • The reduction of number of cells from 1010 to one will result into the del factor (?) of


  • Options
  • A. 1
  • B. 10
  • C. 23
  • D. 103

  • Correct Answer
  • 23 


  • Sterilization problems


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    • 1. The K used in the equation for X10=2.303/K depends upon

    • Options
    • A. nature of the filter material
    • B. linear velocity of the air passing through filter
    • C. both (a) and (b)
    • D. thickness of the filter
    • Discuss
    • 2. Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where NSt is the Stokes number)

    • Options
    • A. ?imp = 0.075NSt1.2
    • B. ?imp = 0.75NSt1.2
    • C. ?imp = 0.25NSt1.2
    • D. ?imp = 0.025NSt1.2
    • Discuss
    • 3. The collection efficiency by diffusion increases with

    • Options
    • A. decreasing particle size
    • B. decreasing air velocity
    • C. both (a) and (b)
    • D. increasing particle size
    • Discuss
    • 4. In sterilization process, spore of which of the following organism is considered as control?

    • Options
    • A. Bacillus subtilis
    • B. Clostridium botulinum
    • C. Bacillus stearothermophilus
    • D. Aspergillus niger
    • Discuss
    • 5. The X90 value for a filtration system is

    • Options
    • A. the time required to reduce microbial population by 90%
    • B. the time required to traverse survivor curve by one log cycle.
    • C. the depth required to reduce population by 90%
    • D. the depth of the filter required to reduce population by 99%
    • Discuss
    • 6. If the packing density (?) is defined as the volume of the fiber unit volume of filter bed, the velocity within the filter void space is equal to (where V is velocity in fluid void space and V0 is undisturbed fluid velocity)

    • Options
    • A. V = V0/(1-?)
    • B. V-V0 = 1 - ?
    • C. V = V0(1 - ?)
    • D. V = V0/(1 + ?)
    • Discuss
    • 7. For the turbulent flow, the dispersion coefficient is correlated as a function of

    • Options
    • A. Reynolds number
    • B. Sherwood number
    • C. Schmidt number
    • D. Grashof number
    • Discuss
    • 8. The deviation from ideal plug flow due to axial mixing can be described by the

    • Options
    • A. dispersion model
    • B. Langmuir model
    • C. Friedlander model
    • D. Pasceri model
    • Discuss
    • 9. The del factor (?) increases as the final number of cells

    • Options
    • A. decreases
    • B. increases
    • C. zero
    • D. constant
    • Discuss
    • 10. For indirect heating, the plate and frame heat exchanger is generally more effective than the shell and tube heat transfer due to its

    • Options
    • A. larger heat transfer area
    • B. smaller heat transfer area
    • C. lesser cost
    • D. more number of plates
    • Discuss


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