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Home Biochemical Engineering Fermentation Reactors Comments

  • Question
  • In a fluidized bed reactor, the function of the disengagement zone is to


  • Options
  • A. reduce loss of particles from the reactor
  • B. reduce the velocity of the particles near the surface of the reactor
  • C. reduce foaming problems
  • D. all of the above

  • Correct Answer
  • all of the above 


  • Fermentation Reactors problems


    Search Results


    • 1. Fed batch reactors is used to produce vinegar because

    • Options
    • A. it can maintain low ethanol concentrations
    • B. it can maintain low acetic acid concentrations
    • C. acetic acid bacteria tend to ferment at high ethanol concentrations
    • D. all of the above
    • Discuss
    • 2. A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.

    • Options
    • A. continuous
    • B. batch
    • C. fed-batch
    • D. semi continuous
    • Discuss
    • 3. Which of the following would not be subjected to the "glucose effect"?

    • Options
    • A. Aspergillus fumigatus
    • B. Saccharomyces cerevisiae
    • C. Escherichia coli
    • D. Aspergillus niger
    • Discuss
    • 4. On a glucose medium, the growth of an organism is characterized by the following Monod model and stoichiometric parameters ?m = 0.3 h-1, Ks =0.05 g.l-1 and Yxs = 0.3 g.g-1 When this organism is grown in a 2 litre continuous on a medium containing 10 g.l-1 of glucose added at 1 l.h-1, the steady state concentration of biomass in the reactor will be

    • Options
    • A. 0 g.l-1
    • B. 0.4 g.l-1
    • C. 0.5 g.l-1
    • D. 10 g.l-1
    • Discuss
    • 5. In a continuous reactor, the medium contains 40 g.l-1 of maltose and the medium flow rate is 10 litres per hour and the effluent contains 20 g.l-l of lactate. What is the productivity of lactate production from this reactor?

    • Options
    • A. 50 g maltose.l-1
    • B. 50 g lactate.l-1
    • C. 200 g maltose.l-1
    • D. 200 g lactate.l-1
    • Discuss
    • 6. 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
    • Discuss
    • 7. The cellular productivity in a continuous stirred tank fermenter (CSTF) increases with an increase in the dilution rate and reaches a maximum value. If the dilution rate is increased beyond the maximum point, the productivity will

    • Options
    • A. decrease abruptly
    • B. increase
    • C. increase drastically
    • D. be zero
    • Discuss
    • 8. Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is

    • Options
    • A. time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
    • B. total amount in rector = rate of addition to reactor - rate of removal + rate of formation
    • C. rate of total amount in rector = rate of addition to reactor - rate of removal + rate of formation
    • D. none of the above
    • Discuss
    • 9. In batch culture, protogon is produced from peptone during the stationary phase with a yield of 0.4 protogon mg per g of peptone. If it is to be produced in a chemostat at a dilution rate of 0.5 h-1 from a medium containing 10 g.l-1 of peptone, then the rate of protogon synthesis would be

    • Options
    • A. 0 g.l-1h-1
    • B. 0.5 g.l-1h-1
    • C. 1 g.l-1h-1
    • D. 2 g.l-1h-1
    • Discuss
    • 10. The lowest biomass yield in a culture of Escherichia coli will be in

    • Options
    • A. an aerated batch culture containing a initial high concentration of glucose
    • B. an aerated batch reactor containing an initial low concentration of glucose
    • C. an aerated fed-batch reactor having a low glucose concentration
    • D. an aerated continuous reactor having a low glucose concentration
    • Discuss


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