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Home Biochemical Engineering Sterilization Comments

  • Question
  • 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%

  • Correct Answer
  • the depth required to reduce population by 90% 


  • Sterilization problems


    Search Results


    • 1. The highest temperature which appears to be feasible for batch sterilization is

    • Options
    • A. 121°C
    • B. 100°C
    • C. 105°C
    • D. 130°C
    • Discuss
    • 2. Sterilization can be carried out by

    • Options
    • A. heat
    • B. radiation
    • C. chemical agents
    • D. all of these
    • Discuss
    • 3. For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is

    • Options
    • A. 0.5
    • B. 0.75
    • C. 0.87
    • D. 0.37
    • Discuss
    • 4. The destruction of microorganisms by steam may be described as

    • Options
    • A. first order chemical reaction
    • B. zero order chemical reaction
    • C. second order chemical reaction
    • D. none of these
    • Discuss
    • 5. The heat conduction in dry air is

    • Options
    • A. less rapid than in steam
    • B. more rapid than in steam
    • C. similar to steam
    • D. none of these
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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
    • Discuss


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