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Home Biochemical Engineering Fermentation Kinetics Comments

  • Question
  • Fermentor should be filled with medium upto


  • Options
  • A. 65-70%
  • B. 70-75%
  • C. 75-80%
  • D. 80-85%

  • Correct Answer
  • 75-80% 


  • Fermentation Kinetics problems


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    • 1. Bubble column reactor has

    • Options
    • A. large height to diameter ratio
    • B. small height to diameter ratio
    • C. large diameter to height ratio
    • D. small diameter to height ratio
    • Discuss
    • 2. The function(s) of the draft tube in an airlift bioreactor is

    • Options
    • A. to reduce bubble coalescence
    • B. to improve circulation
    • C. to even out shear conditions throughout the reactor
    • D. all of the above
    • Discuss
    • 3. In an airlift bioreactor, the spent gases released from the liquid are called

    • Options
    • A. downcomer
    • B. disengagement zone
    • C. air riser
    • D. flotsam
    • Discuss
    • 4. An open system in which the growth rate is maintained by the removal and addition of media at such a rate as to maintain a constant cell density is called a

    • Options
    • A. manostat
    • B. chemostat
    • C. turbidostat
    • D. culturostat
    • Discuss
    • 5. The phenomenon in which substrates are used in a sequential manner is known as

    • Options
    • A. trans-substrate genesis
    • B. dialism
    • C. diauxie
    • D. multiplicity
    • Discuss
    • 6. In the death phase

    • Options
    • A. nutrients available for the cells are depleted and begin to die
    • B. the number of viable cells will increase
    • C. nutrients available for cells are replenished and start to multiply
    • D. none of the above
    • Discuss
    • 7. When intracellular enzymes of whole cells are to be used in a bio-conversion process, it is often necessary to____________the cells.

    • Options
    • A. permeabilize
    • B. lyophilize
    • C. heat-kill
    • D. denature
    • Discuss
    • 8. The region of an airlift bioreactor in which the liquid travels in a downward direction is called the

    • Options
    • A. downcomer
    • B. disengagement zone
    • C. air riser
    • D. flotsam
    • Discuss
    • 9. The function of the disengagement zone in an airlift fermenter is to

    • Options
    • A. prevent CO2 rich bubbles from entering the downcomer
    • B. reduce the velocity of the bubbles
    • C. reduce liquid loss as aerosols
    • D. all of the above
    • Discuss
    • 10. Chemostats work on the principle of

    • Options
    • A. maintaining constant volume of culture medium
    • B. maintaining continuous flow of nutrients
    • C. maintaining uniform nutrients concentration
    • D. operating at higher pressure
    • Discuss


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