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Fermentation Reactors problems


  • 1. In plug flow tubular reactor the axial velocity profile on cross-section will be

  • Options
  • A. constant
  • B. varying with time
  • C. non-linear
  • D. power function of time
  • Discuss
  • 2. The ideal tubular-flow fermenter without radial variations is called a

  • Options
  • A. plug flow fermenter
  • B. continuous stirred tank fermenter (CSTF)
  • C. column fermenter
  • D. any intensity of dilution rate near the wash out points
  • Discuss
  • 3. When Escherichia coli grow in a well aerated medium, which of the following will occur?

  • Options
  • A. Fructose di-phosphate accumulation inside the cells leading to cell respiration
  • B. Fructose di-phosphate accumulation inside the cells leading to fermentation
  • C. Fructose di-phosphate will accumulate regardless of the medium composition
  • D. Fructose di-phosphate will accumulate inside the cells leading to anaerobic respiration
  • Discuss
  • 4. Pseudomonas aeruginosa has a maximum specific growth rate of 0.8 h-1 in a medium with glucose as a growth limiting substrate. To prevent wash out, the dilution rate must be set to

  • Options
  • A. greater than 0.8 h-1
  • B. less than 0.8 h-1
  • C. equal to 0.8 h-1
  • D. 1.6 h-1
  • Discuss
  • 5. Which of the following organisms will continue their metabolism at high substrate concentrations?

  • Options
  • A. Pseudomonas aeruginosa
  • B. Saccharomyces cerevisiae
  • C. Bacillus subtilis
  • D. Escherichia coli
  • Discuss
  • 6. In the batch-fed mode, substrate will be added

  • Options
  • A. only at the beginning of the fermentation process
  • B. periodically throughout the fermentation process
  • C. only at the end of the fermentation process
  • D. substrate is never added
  • Discuss
  • 7. Pseudo-steady state in a continuous reactor refers to a reactor in which

  • Options
  • A. Pseudomonads are being cultured
  • B. concentration oscillate around a mean value
  • C. concentration increase with time
  • D. concentration decrease with time
  • Discuss
  • 8. In a plug flow reactor, the highest concentration of substrates is exposed to the cells that

  • Options
  • A. are near the effluent or exit of the reactor
  • B. are in the mid way along the reactor
  • C. are located near entrance of feed
  • D. are near the wall of the reactor
  • Discuss
  • 9. In fed batch bioreactor modelling, the rate of change in the bioreactor volume is assumed to be equal to

  • Options
  • A. flow rate
  • B. initial volume
  • C. volume of solids in the reactor
  • D. none of these
  • Discuss
  • 10. Which of the following is not correct with regards to continuous cultures?

  • Options
  • A. The major industrial scale application of continuous cultures is in waste water treatment
  • B. Mutation and contamination present a major risk to the operation of continuous cultures for the production of metabolites
  • C. The continuous cultures is very useful for the production of pharmaceuticals
  • D. Continuous cultures have an advantage that they do not need to shut down as regularly as batch culture reactor
  • Discuss

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