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

  • Correct Answer
  • 200 g lactate.l-1 


  • More questions

    • 1. The activated sludge process consists of returning a portion of the clarifier

    • Options
    • A. effluent water entering the reactor
    • B. influent water coming out of the reactor
    • C. influent water entering the reactor
    • D. effluent water coming out of the reactor
    • Discuss
    • 2. Functional groups of the nonessential amino acid residues that are suitable for the immobilization process are

    • Options
    • A. free ?-, ?- or ? carb oxyl groups
    • B. ? or ? amino groups
    • C. phenyl, hydroxyl, sulfhydryl or imidazole groups
    • D. all of the above
    • Discuss
    • 3. A classical uncompetitive inhibitor is a compound that binds

    • Options
    • A. reversibly to the enzyme substrate complex yielding an inactive ESI complex
    • B. irreversibly to the enzyme substrate complex yielding an inactive ESI complex
    • C. reversibly to the enzyme substrate complex yielding an active ESI complex
    • D. irreversibly to the enzyme substrate complex yielding an active ESI complex
    • Discuss
    • 4. The approach which is commonly used to determine the level of damage to animal cells in a culture medium is to monitor

    • Options
    • A. the concentration of lactate in the medium
    • B. the level of lactate oxidase activity in the medium
    • C. the level of lactate dehydrogenase activity
    • D. the level of lactase activity in the medium
    • Discuss
    • 5. Linear inhibition is sometimes called as

    • Options
    • A. complete inhibition
    • B. incomplete inhibtion
    • C. partial inhibition
    • D. mixed inhibition
    • Discuss
    • 6. If the stirring speed increased from 300 to 500 rpm leads to an increase in the reaction rate by two folds. Then it may be concluded that

    • Options
    • A. the reaction was mass transfer limited at 300 rpm
    • B. the reaction was mass transfer limited at 500 rpm
    • C. the reaction did not involve any mass transfer step
    • D. the movement of molecules in the reactor at 300 rpm occurred due to diffusion alone
    • Discuss
    • 7. Which of the following number is calculated from the diameter and peripheral speed of the impeller?

    • Options
    • A. Reynolds number
    • B. Froude number
    • C. Power number
    • D. None of these
    • Discuss
    • 8. In aerobic microorganisms cultures radial flow impellers are used because

    • Options
    • A. they provide energy efficient high turbulent mixing conditions
    • B. they provide low shear mixing conditions
    • C. they provide high shear mixing conditions
    • D. they ensure that bubble size is maximized leading to high oxygen transfer rates
    • Discuss
    • 9. A fermentation system has a KLa of 3 s-1 and a C0* of 5 ppm of O2. If the bulk liquid is saturated with oxygen then the oxygen transfer rate will be equal to

    • Options
    • A. zero
    • B. 3 mg.l-1.s-1
    • C. 5 mg.l-1.s-1
    • D. 15 mg.l-1.s-1
    • Discuss
    • 10. For aerated mixing vessels in an aqueous solution, the mass transfer coefficient (kL) co-relating power consumption (Pm) and fermenter volume (V) can be expressed as

    • Options
    • A. kL ? (Pm/V)0.33
    • B. kL ? (Pm/V)0.66
    • C. kL ? (Pm/V)0.50
    • D. kL ? (Pm/V)
    • Discuss


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