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Vinegar and Citric Acid problems


  • 1. Spirit vinegar is produced from

  • Options
  • A. fruit juices
  • B. malted grain
  • C. ethanol
  • D. ale
  • Discuss
  • 2. For the recovery of citric acid after fermentation, Ca(OH)2 is added to the slurry to

  • Options
  • A. precipitate calcium carbonate
  • B. precipitate calcium citrate
  • C. precipitate calcium phosphate
  • D. precipitate calcium sulphate
  • Discuss
  • 3. Ethanol is oxidized to acetic acid aerobically using

  • Options
  • A. Acetobacter
  • B. Gluconobacter
  • C. both (a) and (b)
  • D. Lactobacillus
  • Discuss
  • 4. Vinegar production consists of

  • Options
  • A. aerobic fermentation
  • B. anaerobic fermentation
  • C. aerobic fermentation followed by anaerobic fermentation
  • D. anaerobic fermentation followed by aerobic fermentation
  • Discuss
  • 5. In koji process for the fermentation to produce citric acid,

  • Options
  • A. A. niger is used with solid substrate as sweet potato
  • B. A. niger floats on the surface of solution
  • C. Fungal mycelium grows through out the solution in a deep tank
  • D. both (a) and (b)
  • Discuss
  • 6. During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?

  • Options
  • A. HCl
  • B. HNO3
  • C. H2SO4
  • D. None of these
  • Discuss
  • 7. Which substrate is used in the fermentation of citric acid?

  • Options
  • A. Beet molasses
  • B. Sucrose
  • C. Starch hydrolysate
  • D. All of these
  • Discuss
  • 8. What is the pH of the medium when molasses is used as substrate for the production of citric acid?

  • Options
  • A. 3
  • B. 4
  • C. 5
  • D. 6
  • Also asked in: Bank Exams, CAT

  • Discuss
  • 9. Which of the following nitrogen sources is added in the fermentation medium of citric acid production?

  • Options
  • A. Ammonium salt
  • B. Urea
  • C. Both (a) and (b)
  • D. Peptone
  • Discuss
  • 10. In liquid surface culture process for the fermentation to produce citric acid,

  • Options
  • A. A. niger is used with solid substrate as sweet potato
  • B. A. niger floats on the surface of solution
  • C. Fungal mycelium grows through out the solution in a deep tank
  • D. both (a) and (b)
  • Discuss

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