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Home Biochemical Engineering Immobilized Enzyme See What Others Are Saying!
  • Question
  • If Damkohler number, NDa >>1, the reaction rate is much greater than the mass transfer rate and the overall reaction is controlled by the rate of mass transfer. In this case, the enzyme reaction can be described as (where Csb and Cs are the substrate concentration in bulk of solution and at the immobilized enzyme surface respectively. ks mass transfer coefficient, and a is the surface area of an immobilized enzyme particles)


  • Options
  • A. rp = ksa(Csb-Cs)
  • B. rp = ksaCsb
  • C. rp = ksaCs
  • D. rp = ksa(Csb+Cs)

  • Correct Answer
  • rp = ksaCsb 


  • More questions

    • 1. In a bioreactor, if at a particular time the oxygen transfer rate is 23 kg.h-1, then the oxygen uptake will be

    • Options
    • A. 23 kg.h-1
    • B. less than 23 kg.h-1
    • C. greater than 23 kg.h-1
    • D. 2.3 kg.h-1
    • Discuss
    • 2. Temporary hardness of water is caused by the presence of

    • Options
    • A. chlorides of calcium and magnesium
    • B. sulfates of calcium and magnesium
    • C. bicarbonates of calcium and magnesium
    • D. carbonates of sodium and potassium
    • Discuss
    • 3. The lowest yield of ATP /is in

    • Options
    • A. fermentation
    • B. aerobic respiration
    • C. anaerobic respiration
    • D. same in (a), (b) and (c)
    • Discuss
    • 4. Micro filtration refers to the separation of suspended material such as bacteria by using a membrane with spore sizes of

    • Options
    • A. 0.02 to 10?m
    • B. 1-10A°
    • C. 20-30?m
    • D. 10-200A°
    • Discuss
    • 5. The disk centrifuge is the type of centrifuge used most often for bio separations due to its

    • Options
    • A. continuous operation
    • B. lesser cost
    • C. higher speed
    • D. ease in operation
    • Discuss
    • 6. A thixotropic 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
    • 7. The effect of increasing the stirrer speed in an unbaffled stirred tank reactor is that

    • Options
    • A. a small increase in stirrer speed will cause the liquid to enter the turbulent flow regime
    • B. as the stirrer speed increases, the liquid will continue to circulate and then become turbulent
    • C. as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.
    • D. A vortex will form at low stirrer speeds. As the stirrer speed increases the liquid will start to circulate
    • Discuss
    • 8. In wastewater treatment, which bioreactor is generally used?

    • Options
    • A. Plug flow reactor
    • B. Trickle bed reactor
    • C. Tower fermentor
    • D. CSTR
    • Discuss
    • 9. Which of the following would be best described as an axial flow impeller?

    • Options
    • A. An impeller with blades pitched at 45° to the vertical
    • B. An impeller which directs liquid flow towards the base of the reactor
    • C. Both (a) and (b)
    • D. An impeller with blades pitched at 75° to the vertical
    • Discuss
    • 10. Turbine impeller consists of flat impeller blades with

    • Options
    • A. a vertical pitch welded directly to the shaft
    • B. a angled pitch welded directly to the shaft
    • C. a vertical pitch welded to a horizontal disk
    • D. a angled pitch welded to a horizontal disk
    • Discuss


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