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  • Question
  • 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

  • Correct Answer
  • ?overall = ?heating + ?holding+ ?cooling 


  • Sterilization problems


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    • 1. 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
    • 2. The del factor (?) increases as the final number of cells

    • Options
    • A. decreases
    • B. increases
    • C. zero
    • D. constant
    • Discuss
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. The mechanism of air filtration in fibrous filter is

    • Options
    • A. electrostatic attraction
    • B. impaction
    • C. interception
    • D. all of these
    • Discuss
    • 10. 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
    • Discuss


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