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Home Biochemical Engineering Fermentation Kinetics Comments

  • Question
  • Turbidostat is recommended when continuous fermentation needs to be carried out at


  • Options
  • A. high dilution rates near the washout point
  • B. low dilution rates near the washout point
  • C. moderate dilution rates near the washout point
  • D. any intensity of dilution rates near the washout point

  • Correct Answer
  • high dilution rates near the washout point 


  • Fermentation Kinetics problems


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    • 1. Which of the following is incorrect?

    • Options
    • A. The mechanical agitation and aeration are effective for suspension of cells
    • B. The mechanical agitation and aeration are effective for mixing the medium
    • C. STF can't be used for high viscosity medium
    • D. The mechanical agitation and aeration are effective for oxygenation
    • Discuss
    • 2. An internal draft tube is preferrred to an external draft tube because

    • Options
    • A. it is easier to clean and sterilize a reactor
    • B. it is cheaper to build a reactor with an internal draft tube
    • C. Both (a) and (b)
    • D. none of the above
    • Discuss
    • 3. If the specific growth rate, ?. is constant with time during the exponential growth period, the equation correlating bacterial number density Cn), cell number concentration with respect to time can be expressed as

    • Options
    • A. Cn= Cn0 exp[? (t - t0)]
    • B. Cn0 = Cn exp[? (t - t0)]
    • C. Cn/Cn0 =(1/?)exp(t-t0)
    • D. Cn0 / Cn = (1/?)exp(t-t0)
    • Discuss
    • 4. A functional relationship between the specific growth rate and essential compounds concentration was proposed by Monod in

    • Options
    • A. 1958
    • B. 1946
    • C. 1942
    • D. 1950
    • Discuss
    • 5. The contents in bubble column and air lift reactor are mixed through

    • Options
    • A. compressed air
    • B. a mechanical internal moving part
    • C. external pumping
    • D. any of these
    • Discuss
    • 6. Tower fermentors are used for

    • Options
    • A. continuous penicillin production
    • B. continuous beer production
    • C. production of enzymes
    • D. batch production of beer
    • Discuss
    • 7. The main function(s) of a draft tube in an air lift fermenter is/are to

    • Options
    • A. increase the solubility of oxygen
    • B. distribute shear forces throughout the reactor and minimise bubble coalescence
    • C. concentrate shear forces around the sparger
    • D. concentrate shear forces near the disengagement zone
    • Discuss
    • 8. The bubble column fermenter is usually limited to

    • Options
    • A. aerobic fermentations
    • B. anaerobic fermentations
    • C. Both (a) and (b)
    • D. facultative fermentation
    • Discuss
    • 9. The specific growth rate is affected by

    • Options
    • A. sabstrate concentration
    • B. product concentration
    • C. oxygen supply
    • D. all of these
    • Discuss
    • 10. In a batch reactor specific growth rate

    • Options
    • A. remains constant throughout the process
    • B. increases exponentially
    • C. changes during the fermentation
    • D. is highest during the stationary phase
    • Discuss


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