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Home Biochemical Engineering Fermentation Kinetics See What Others Are Saying!
  • Question
  • 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)

  • Correct Answer
  • Cn= Cn0 exp[? (t - t0)] 


  • More questions

    • 1. Trichoderma ?-glucanase is reported

    • Options
    • A. to stabilize mashing
    • B. to convert taste fractions of dextrins to fermentable sugars in beer
    • C. to convert starch to dextrin
    • D. all of the above
    • Discuss
    • 2. The maximum desirable limit (BIS of mercury in the drinking water is

    • Options
    • A. 0.05 mg/l
    • B. 0.9 mg/l
    • C. 0.1 mg/l
    • D. 0.001 mg/l
    • Discuss
    • 3. An ion exchange resin is composed of

    • Options
    • A. polymeric network
    • B. ionic functional groups
    • C. counter ions
    • D. all of these
    • Discuss
    • 4. Which of the operation does not come under upstream processing?

    • Options
    • A. Media preparation
    • B. Inoculum development
    • C. Effluent treatment
    • D. Storage of raw material
    • Discuss
    • 5. Which of the following is the commonly employed adsorbents?

    • Options
    • A. Calcium carbonate
    • B. Alumina
    • C. Celluloses
    • D. All of these
    • Discuss
    • 6. When a culture of fermenting yeast becomes metabolically uncoupled, ethanol

    • Options
    • A. becomes a secondary metabolite
    • B. production becomes growth associated
    • C. production becomes non-growth associated
    • D. becomes a growth nutrient
    • Discuss
    • 7. Which of the following would be best described as a radial flow impeller?

    • Options
    • A. An impeller with blades pitched at 45° to the vertical
    • B. A Rushton turbine
    • C. Both (a) and (b)
    • D. An impeller which directs liquid flow towards the base of the reactor
    • Discuss
    • 8. A higher liquid height will lead to a higher gas hold up by which the oxygen transfer rate will be

    • Options
    • A. higher throughout the reactor
    • B. lower throughout the reactor
    • C. higher at the base of the reactor
    • D. lower at the base of the reactor
    • Discuss
    • 9. A fed-batch reactor initially contains 2 litre of medium. If it was fed at 1 litre per hour, then after 10 hours, the volume of the reactor will be

    • Options
    • A. 1 litre
    • B. 2 litre
    • C. 3 litre
    • D. 13 litre
    • Discuss
    • 10. Reynolds number for laminar flow over a plate should be less than

    • Options
    • A. 500 mm
    • B. 5 x 10-5
    • C. 5 x 105
    • D. 5 m
    • Discuss


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