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Home Biochemical Engineering Agitation and Aeration See What Others Are Saying!
  • Question
  • The power required by an impeller in a gas sparged system compare to the power required by impeller operating at same speed in a gas free liquid is usually


  • Options
  • A. lesser
  • B. higher
  • C. same
  • D. may be lesser or higher depending upon the geometry

  • Correct Answer
  • lesser 


  • More questions

    • 1. A rheopectic 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 mixing time
    • D. decreases with mixing time
    • Discuss
    • 2. When liquid is pumped through cooling coil in a stirred tank reactor to cool. Which of the following is not correct?

    • Options
    • A. If the stirrer speed is increased, the rate will be faster
    • B. Baffles in the tank will increase the rate of cooling
    • C. Faster cooling rates at a slower rate of pumping
    • D. Faster cooling rates at a faster rate of pumping
    • Discuss
    • 3. The main reason for production of antibiotics in fed batch reactors is

    • Options
    • A. the presence of precursors is often toxic to the cells
    • B. higher yields when cells enter the stationary phase
    • C. higher yields when cell growth slows
    • D. all of the above
    • Discuss
    • 4. The effect of non-competitive inhibition on a Lineweaver-Burk Plot is that

    • Options
    • A. it can move the entire curve to the right
    • B. it can change the y-intercept
    • C. it can change the x-intercept
    • D. all of these
    • Discuss
    • 5. The activated sludge process is sometime referred as

    • Options
    • A. fluid bed biological oxidation system
    • B. fixed bed biological oxidation system
    • C. turning bed biological oxidation system
    • D. none of the above
    • Discuss
    • 6. The correlation often employed to correlate adsorption data for protein is (where Ymax is the maximum amount of solute adsorbed per mass of adsorbent, X is the mass fraction of solute in the diluent phase in solute-free basis, KL is a constant and Y is the equilibrium value of the mass of solute adsorbed per mass of adsorbent)

    • Options
    • A. Y = YmaxX/(KL+X)
    • B. Y = Ymax/(KL+X)
    • C. Y = YmaxX/KL
    • D. Y = Ymax- X/ (KL+X)
    • Discuss
    • 7. Concentration polarization can be reduced further by

    • Options
    • A. pre filtering the solution
    • B. reducing the flow rate per unit membrane surface area
    • C. back washing periodically
    • D. all of the above
    • Discuss
    • 8. 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
    • 9. Selectivity can be expressed as

    • Options
    • A. ratio of the distribution coefficients in different solute
    • B. mass fraction of the solute in the extract phase at equilibrium
    • C. mass fraction of the solute in the raffinate phase
    • D. ratio of the mass fraction of the solute in the extract phase to the raffinate phase
    • Discuss
    • 10. During the enzymatic reaction of an immobilized enzyme, the rate of substrate transfer is

    • Options
    • A. equal to that of substrate consumption
    • B. more than that of substrate consumption
    • C. lesser than that of substrate consumption
    • D. is nothing to do with the substrate consumption
    • Discuss


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