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  • Question
  • Filtration leaf test results indicate that the filtration rate of a protein product is 100 dry lbs/(ft2 hr). What size production filter would be required to obtain 100 dry lbs of filter cake/hr?


  • Options
  • A. 1.54 ft2
  • B. 3.08 ft2
  • C. 65 ft2
  • D. 65 lbs/ ft2.hr

  • Correct Answer
  • 1.54 ft2 


  • More questions

    • 1. Given an enzyme with a Km = 10m M and Vmax = 100 m mol/min. If [S] = 100 m M, which of the following will be true?

    • Options
    • A. A 10 fold increase in Vmax would increase velocity 10 fold y
    • B. A 10 fold decrease in Km would increase velocity
    • C. Both (a) and (b)
    • D. A 10 fold increase in Vmax would decrease velocity 20 fold
    • Discuss
    • 2. During fermentation, the saturation concentration of oxygen was reduced from 7 ppm. to 1 ppm. Which one of the following conclusions can be drawn?

    • Options
    • A. Microbial growth is oxygen limited since the oxygen concentration is lesser than the saturation concentration
    • B. Microbial growth is not oxygen limited since the oxygen concentration is lesser than the saturation concentration
    • C. Experimental error leads to the reduction
    • D. No conclusion can be drawn
    • Discuss
    • 3. Power consumption by agitation is

    • Options
    • A. a function of physical properties
    • B. a function of operating conditions
    • C. a function of vessel and impeller geometry
    • D. all of the above
    • Discuss
    • 4. The rate equation in non-competitive inhibition based on Michaelis Menten equation is given by

    • Options
    • A. rmaxS/(Km + S)(1+I/Ki)
    • B. rmaxE/(Km (1+I/Ki)+S))
    • C. VmaxS/(Km + S)(1+I/Ki)
    • D. rmaxS/Km
    • Discuss
    • 5. The rate equation in competitive inhibition based on Michaelis Menten equation is given by

    • Options
    • A. rmaxS/(Km (1+I/Ki)+S))
    • B. rmaxE/(Km (1+I/Ki)+S))
    • C. rmaxI/(Km (1+I/Ki)+S))
    • D. rmaxS/(Km (1+I/Ki))
    • Discuss
    • 6. Which of the following is best described as secondary metabolite?

    • Options
    • A. Acetic acid produced from the oxidation of ethanol
    • B. Ethanol from the fermentation of glucose
    • C. Penicillin
    • D. Citric acid from the partial oxidation of glucose
    • Discuss
    • 7. 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
    • 8. A fed-batch reactor containing 1 g.l-1 of substrate in 2 litre of medium. It is fed with 1 g.l-l of substrate at the rate of 1 litre per hour. After 10 hours, the concentration of substrate in the reactor was 0.5 g.l-1 . The mass of substrate that was used by the culture in the reactor was

    • Options
    • A. 2g
    • B. 6g
    • C. 8g
    • D. 12g
    • Discuss
    • 9. In aerobic yeast fermentation for production of citric acid from alkanes using a fed-batch culture, why alkanes are slowly fed to the yeast?

    • Options
    • A. Citric acid is toxic to the cells
    • B. Alkanes cause foaming
    • C. Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
    • D. Fast addition of alkanes will cause the cells to grow too quickly
    • Discuss
    • 10. Power number is ratio of

    • Options
    • A. imposed forced to intertial force
    • B. bouyant force to inertial force
    • C. gravitation force to inertial force
    • D. imposed force to gravitational force
    • Discuss


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