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Home Biochemical Engineering Fermentation Reactors See What Others Are Saying!
  • Question
  • A chemostat has a liquid volume of 2 litres and is being fed at a rate of 4 litres per hour. Dilution rate for this reactor will be


  • Options
  • A. 2 litres
  • B. 2 litres per hour
  • C. 2 h-1
  • D. 4 litres per hour

  • Correct Answer
  • 2 h-1 


  • More questions

    • 1. Coliform bacteria in water is an indication of the presence of

    • Options
    • A. radioactive wastes
    • B. excess fertilizer
    • C. decaying animals and plants
    • D. human feces
    • Discuss
    • 2. Non-competitive inhibitor of an enzyme catalyzed reaction

    • Options
    • A. decreases Vmax
    • B. binds to Michaelis complex (ES)
    • C. both (a) and (b)
    • D. can actually increase reaction velocity in rare cases
    • Discuss
    • 3. At the end of the lag phase, when growth begins, the division rate increases gradually and reaches a maximum value in the exponential growth period. This transitional period is commonly called the accelerated growth phase and is often included as a part of the

    • Options
    • A. lag phase
    • B. stationary phase
    • C. death phase
    • D. exponential growth phase
    • Discuss
    • 4. In a fluidized bed reactor mixing is achieved by

    • Options
    • A. gravity flow of fluid
    • B. upward movement of the incoming feed
    • C. diffusion
    • D. both (a) and (b)
    • Discuss
    • 5. When an enzyme is functioning at Vmax, the rate of the reaction is limited by

    • Options
    • A. the number of collisions between enzyme and substrate
    • B. the number of substrate molecules in the reaction
    • C. the concentration of the substrate
    • D. the rate at which the enzyme can convert substrate to product
    • Discuss
    • 6. Which of the following(s) is/are considered the limitations of the exponential growth model?

    • Options
    • A. Only predicts that cells grow exponentially during the log phase
    • B. It does not consider factors that causes cells growth to stop or slow
    • C. Predicts cell growth at a linear rate
    • D. All of the above
    • Discuss
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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