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Home Biochemical Engineering Agitation and Aeration See What Others Are Saying!
  • Question
  • Penetration theory assumes that turbulent eddies travel from the bulk of the phase to the interface where they remain constant for a constant exposure time (te). The model correlating KL, mass transfer coefficient and DAB, diffusivity can be expressed as


  • Options
  • A. KL = 2(DAB/?te)0.25
  • B. KL = 2(DAB/?te)0.5
  • C. KL = 2(DAB/?te)0.75
  • D. KL = 2(DAB/?te)

  • Correct Answer
  • KL = 2(DAB/?te)0.5 


  • More questions

    • 1. Which of the following metallic ion is there in ascorbic acid oxidase?

    • Options
    • A. Mg
    • B. Fe
    • C. Cu
    • D. Mn
    • Discuss
    • 2. The collection efficiency by impaction increases with

    • Options
    • A. increasing particle diameter
    • B. increasing air flow velocity
    • C. both (a) and (b)
    • D. increasing particle size
    • Discuss
    • 3. The specific death rate of an organism can be expressed as

    • Options
    • A. ln 2/D
    • B. D/ln2
    • C. D.ln2
    • D. 2.0.3/ln2
    • Discuss
    • 4. Bioreactors, where vortex is formed, another dimensionless number, __________ is useful.

    • Options
    • A. Stanton
    • B. Rayleigh
    • C. Bond
    • D. Froude
    • Discuss
    • 5. Which of the following is considered as a disadvantage to the adsorption method of immobilization?

    • Options
    • A. It is possible to separate and purify the enzymes while being immobilized
    • B. The enzymes are not usually deactivated by adsorption
    • C. The adsorption is a reversible process
    • D. State of immobilization is very sensitive to solution pH, ionic strength and temperature
    • Discuss
    • 6. Which of the following statements is not true?

    • Options
    • A. Enzymes are proteins that bind to specific substrates and increase the velocity of reactions involving those substrates
    • B. Enzymes function by overcoming the activation energy barrier of a reaction
    • C. Enzymes make thermodynamically favorable reactions to proceed; they cannot make unfavorable reactions to occur
    • D. Enzymes only function when they are in intact cells
    • Discuss
    • 7. A viscoelastic fluid is one in which the viscosity

    • Options
    • A. is constant regardless of the stirrer speed or mixing time
    • B. changes during mixing but returns to its original state after mixing
    • C. increases with increasing stirrer speed
    • D. decreases with increasing stirrer speed
    • Discuss
    • 8. An allosteric inhibitor of an enzyme usually

    • Options
    • A. participates in feedback regulation
    • B. denatures the enzyme
    • C. is a hydrophobic compound
    • D. causes the enzyme to work faster
    • Discuss
    • 9. Juice clarification extraction is facilitated by using

    • Options
    • A. cellulases
    • B. amylase
    • C. inulinase
    • D. lactase
    • Discuss
    • 10. Chemostats work on the principle of

    • Options
    • A. maintaining constant volume of culture medium
    • B. maintaining continuous flow of nutrients
    • C. maintaining uniform nutrients concentration
    • D. operating at higher pressure
    • Discuss


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