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Home Biochemical Engineering Sterilization See What Others Are Saying!
  • Question
  • For the turbulent flow, the dispersion coefficient is correlated as a function of


  • Options
  • A. Reynolds number
  • B. Sherwood number
  • C. Schmidt number
  • D. Grashof number

  • Correct Answer
  • Reynolds number 


  • 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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