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Home Biochemical Engineering Fermentation Kinetics Comments

  • Question
  • In wastewater treatment, which bioreactor is generally used?


  • Options
  • A. Plug flow reactor
  • B. Trickle bed reactor
  • C. Tower fermentor
  • D. CSTR

  • Correct Answer
  • Trickle bed reactor 


  • Fermentation Kinetics problems


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    • 1. The height to diameter ratio (H/D) for the tank fermenters is

    • Options
    • A. <3
    • B. >3
    • C. <1.5
    • D. >1.5
    • Discuss
    • 2. The application of just in time (JIT) manufacturing techniques in biotechnology is important because

    • Options
    • A. raw materials used in biotechnology are biodegradable
    • B. the products of biotechnology are biodegradable
    • C. it is a very competitive business (d) all of the above
    • D. all of the above
    • Discuss
    • 3. The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of

    • Options
    • A. higher oxygen transfer rates
    • B. a small sparge ring
    • C. better heat transfer efficiencies
    • D. all of these
    • Discuss
    • 4. 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
    • Discuss
    • 5. Stirred tank fermenter (STF) can be employed for

    • Options
    • A. aerobic fermentation of a wide range of cells including microbial, animal and plant cells
    • B. anaerobic fermentation of a wide range of cells including microbial, animal and plant cells
    • C. Both (a) and (b)
    • D. anaerobic fermentation of plant cells only
    • Discuss
    • 6. A culture in a closed vessel to which no additional medium is added and from which no waste products are removed is called a __________ culture.

    • Options
    • A. continuous
    • B. batch
    • C. fed-batch
    • D. semi continuous
    • Discuss
    • 7. During the log phase cell numbers increase exponentially

    • Options
    • A. because cells produce enzymes
    • B. because cells do not have cell membranes
    • C. because cells are autocatalysts
    • D. because the rate of cell division increases exponentially
    • Discuss
    • 8. The diameter of the baffles in a standard stirred tank bioreactor ranges from

    • Options
    • A. 1/10th - 1/12th of the tank diameter
    • B. 1/3rd - 1/4th of the tank diameter
    • C. 1/15th - 1/20th of the tank diameter
    • D. 1/20th - 1/25th of the tank diameter
    • Discuss
    • 9. The advantage of airlift bioreactors over stirred tank bioreactors of a similar size is

    • Options
    • A. higher oxygen transfer rates
    • B. more uniform shear conditions
    • C. both (a) and (b)
    • D. less foaming
    • Discuss
    • 10. During the lag phase

    • Options
    • A. cells just start growing
    • B. cells synthesize new proteins and membrane components
    • C. cells produce antibiotics to kill competing organisms
    • D. cells simply grow slowly
    • Discuss


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