Discussion
Home ‣ Biotechnology ‣ Vinegar and Citric Acid Comments
- Question
Spirit vinegar is produced from
Options- A. fruit juices
- B. malted grain
- C. ethanol
- D. ale
- Correct Answer
- ethanol
- 1. Candida utilis is used for the fermentation of waste sulphate liquor since it ferments
Options- A. hexoses only
- B. pentoses only
- C. both hexoses and pentoses
- D. none of these Discuss
- 2. Ethanol is produced by
Options- A. continuous fermentation
- B. batch fermentation
- C. both (a) and (b)
- D. none of these Discuss
- 3. Which of the following organism is not used in any of the traditional industrial fermentation?
Options- A. E. coli
- B. Yeast
- C. Bacillus
- D. Pseudomonas Discuss
- 4. How is air supply to the fermentor sterilized?
Options- A. By heat filtration
- B. Filtration through fibrous material
- C. Filtration through granular material
- D. All of the above Discuss
- 5. The fermentor can be sterilized by
Options- A. keeping it in the oven
- B. steam under pressure
- C. boiling
- D. all of these Discuss
- 6. 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
- 7. Ethanol is oxidized to acetic acid aerobically using
Options- A. Acetobacter
- B. Gluconobacter
- C. both (a) and (b)
- D. Lactobacillus Discuss
- 8. 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
- 9. 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
- 10. 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
Vinegar and Citric Acid problems
Search Results
Correct Answer: both hexoses and pentoses
Correct Answer: both (a) and (b)
Correct Answer: E. coli
Correct Answer: All of the above
Correct Answer: steam under pressure
Correct Answer: precipitate calcium citrate
Correct Answer: both (a) and (b)
Correct Answer: anaerobic fermentation followed by aerobic fermentation
Correct Answer: A. niger is used with solid substrate as sweet potato
Correct Answer: H2SO4
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