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Home Biochemical Engineering Sterilization Comments

  • Question
  • Glass fibers are favorable as a filter medium because they give a


  • Options
  • A. lower pressure drop and are less liable to wetting or combustion
  • B. more pressure drop and are less liable to wetting or combustion
  • C. lower pressure drop and are more liable to wetting or combustion
  • D. more pressure drop and are more liable to wetting or combustion

  • Correct Answer
  • lower pressure drop and are less liable to wetting or combustion 


  • Sterilization problems


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    • 1. The mechanism of air filtration in fibrous filter is

    • Options
    • A. electrostatic attraction
    • B. impaction
    • C. interception
    • D. all of these
    • Discuss
    • 2. Analogus to the molecular diffusion, the x-directional flux of microorganisms suspended in a medium due to the axial mixing can be represented as (where Jn is flux component 'n', cn is concentration of'n')

    • Options
    • A. Jn = -dcn/dx
    • B. Jn = dcn/dx
    • C. Jn = -D dcn/dx
    • D. Jn = D dcn/dx
    • Discuss
    • 3. The typical size of particles collected by diffusion mechanism is

    • Options
    • A. <0.25?m
    • B. <0.5?m
    • C. <0.75?m
    • D. <1?m
    • Discuss
    • 4. Typical aeration rates for aerobic fermentation are

    • Options
    • A. 0 - 0.5 vvm
    • B. 0.5 - 1.0 vvm
    • C. 1.0 - 1.5 vvm
    • D. 1.5 - 2.0 vvm
    • Discuss
    • 5. The overall del factor (?) may be represented as

    • Options
    • A. ?overall = ?heating + ?holding- ?cooling
    • B. ?overall = ?heating + ?holding+ ?cooling
    • C. ?overall = ?heating - ?holding+ ?cooling
    • D. ?overall = ?heating - ?holding- ?cooling
    • Discuss
    • 6. The mechanical means of accomplishing sterilization of fermentation media/equipment is

    • Options
    • A. ultrasonic
    • B. radiation
    • C. chemical agents
    • D. none of these
    • Discuss
    • 7. The interception efficiency can be expressed as (where dp is the particle diameter and Dc cylindrical collection diameter)

    • Options
    • A. dp/Dc
    • B. dp x Dc
    • C. dp/Dc x 100
    • D. dpDc/100
    • Discuss
    • 8. The filter material used for air filtration system is/are

    • Options
    • A. glass wool
    • B. glass fibre
    • C. norite
    • D. all of the above
    • Discuss
    • 9. The sterilization method depends

    • Options
    • A. nature of additive
    • B. volume and feed rate
    • C. both (a) and (b)
    • D. none of these
    • Discuss
    • 10. Secondary treatment uses __________ to consume wastes.

    • Options
    • A. micro-organisms
    • B. chemicals
    • C. filtration
    • D. none of these
    • Discuss


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