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Home Biochemical Engineering Fermentation Kinetics See What Others Are Saying!
  • Question
  • Which of the following statements would be appropriate while comparing bubble column and air lift fermenter of the same size?


  • Options
  • A. The average bubble size is smaller in an airlift bioreactor
  • B. Oxygen transfer rate is higher in an airlift bioreactor
  • C. The surface area for gas exchange is higher in an airlift bioreactor
  • D. All of the above

  • Correct Answer
  • All of the above 


  • More questions

    • 1. The relationship between the del factor, temperature and time is given as

    • Options
    • A. ? = A.t. e-E/RT
    • B. ? = 1/(A.t. e-E/RT)
    • C. ? = A.t. eE/RT
    • D. ? = A.t.T
    • Discuss
    • 2. 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
    • 3. Diauxie is

    • Options
    • A. growth factors
    • B. microbiological die off
    • C. the simultaneous uptake of nutrients
    • D. the stagewise uptake of nutrients
    • Discuss
    • 4. 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
    • 5. For the extractions operation, the selectivity should be

    • Options
    • A. > 1
    • B. < 1
    • C. 1
    • D. zero
    • Discuss
    • 6. The function of a mechanical seal is to

    • Options
    • A. prevent contaminants entering the reactor
    • B. prevent cells from leaving the reactor
    • C. both (a) and (b)
    • D. prevent air to enter
    • Discuss
    • 7. Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?

    • Options
    • A. Chlorination
    • B. Treating with potassium permagnate
    • C. UV radiation
    • D. Treating with bleaching powder
    • Discuss
    • 8. In the accelerated phase, cell starts to

    • Options
    • A. increase and the division rate increases to reach a maximum
    • B. decrease and the division rate increases to reach a maximum
    • C. increase and the division rate decreases to reach a maximum
    • D. increase and the division rate increases to reach a minimum
    • Discuss
    • 9. Which of the following enzyme is responsible for causing vitamin B deficiency disease beriberi?

    • Options
    • A. Ascorbic acid oxidase
    • B. Thiaminase
    • C. Lipoxygenase
    • D. None of these
    • Discuss
    • 10. A cylindrical reactor has a liquid volume of 100,000 litres. It has an aspect ratio the ratio of the channel height to width of 1:1. The height of the liquid in the reactor will be approximately:

    • Options
    • A. 1.0 m
    • B. 3.0 m
    • C. 5.0 m
    • D. 7.0 m
    • Discuss


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