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Home Biochemical Engineering Agitation and Aeration See What Others Are Saying!
  • Question
  • In a two-phase system where the continuous phase remains in place, the gas hold up can be expressed as (where Vs and Vt are the superficial gas velocity and bubble rise velocity)


  • Options
  • A. H = Vs/(Vs-Vt)
  • B. H = Vs/(Vs+ Vt)
  • C. H = Vs/(Vs.Vt)
  • D. H = (Vs+Vt)/Vs

  • Correct Answer
  • H = Vs/(Vs+ Vt


  • More questions

    • 1. The equation for the rate of product formation for simple enzyme reaction is given by (Where rmax, maximum reaction rate, Cs substrate concentration, Cp product concentration ES, CES enzyme-substrate concentration)

    • Options
    • A. rp = rmax Cs/(Km+Cs)
    • B. rp= rmax CES/(Km+ CES)
    • C. rp = rmax Cs/(Km+CES)
    • D. rp = rmax Cs/(Km+Cp)
    • Discuss
    • 2. Chymosin hydrolyses the bond between

    • Options
    • A. Alanine and glycine
    • B. Phenyl alanine and methonine
    • C. Glutamic acid and alanine
    • D. Alanine and phenyl alanine
    • Discuss
    • 3. Reynolds (Rei) number for the impeller is given by (where Di, stirrer diameter; N, stirrer speed, ?, density of fluid and ?, viscosity of fluid)

    • Options
    • A. DiV?/?
    • B. Di2N?/?
    • C. Di2V?/?
    • D. DiN? /?
    • Discuss
    • 4. A fed-batch reactor containing 2 litre of medium and 0.1 g.l-l of biomass is fed with a medium containing 1 g.l-1 of substrate at 1 litre per hour. If after 10 hours, the concentration of biomass in the reactor was 0.2 g.l-1, then the biomass produced during the 10 hour period is

    • Options
    • A. 1.5 g
    • B. 2.2 g
    • C. 3.0 g
    • D. 6.0 g
    • Discuss
    • 5. Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with

    • Options
    • A. 10% calcium chloride solution
    • B. 10% magnesium sulfate solution
    • C. 10% magnesium chloride solution
    • D. 10% sodium chloride solution
    • Discuss
    • 6. If the viscosity of a fluid decreases with increasing stirrer speed, then the nature of the fluid is

    • Options
    • A. newtonian
    • B. pseudoplastic
    • C. dilatant
    • D. thixotropic
    • Discuss
    • 7. The covalent attachment of enzyme molecules is via

    • Options
    • A. nonessential amino acids residues to water insoluble, functional supports
    • B. essential amino acids residues to water insoluble, functional supports
    • C. nonessential amino acids residues to water soluble, functional supports
    • D. essential amino acids residues to water soluble, functional supports
    • Discuss
    • 8. Which of the following is not a physical method of immobilization?

    • Options
    • A. Adsorption
    • B. Entrapment
    • C. Micro encapsulation
    • D. None of these
    • Discuss
    • 9. In the stationary phase

    • Options
    • A. growth is proportional to death
    • B. growth rate is equal to death rate
    • C. growth rate is lesser than death rate
    • D. no co-relation exist between death rate and growth rate
    • Discuss
    • 10. Which of the following mainly serve to convert starch into high fructose corn syrup (HFCS)?

    • Options
    • A. ?-amylase
    • B. Gluco-isomerase
    • C. Gluco-amylase
    • D. all of these
    • Discuss


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