Vinegar and Citric Acid problems
- 1. Which of the following microorganism is used for the production of citric acid?
Options- A. Lactobacillus bulgaricus
- B. Saccharomyces cerevisiae
- C. Aspergillus niger
- D. Streptococcus lactis Discuss
Correct Answer: Aspergillus niger
- 2. Vinegar is typically produced in fed batch reactors because
Options- A. a fed batch reactor can be used to maintain low acetic acid concentrations
- B. a fed batch reactor can be used to maintain low ethanol concentrations
- C. acetic acid bacteria tend to ferment at high ethanol concentrations
- D. all of the above Discuss
Correct Answer: a fed batch reactor can be used to maintain low ethanol concentrations
- 3. Malt vinegar is produced from
Options- A. fruit juices
- B. malted grain
- C. ethanol
- D. ale Discuss
Correct Answer: malted grain
- 4. Alegar is a type of vinegar produced from
Options- A. fruit juices
- B. malted grain
- C. ethanol
- D. ale Discuss
Correct Answer: ale
- 5. Sugar content of the fermentation medium for citric acid is maintained at
Options- A. 10-15%
- B. 15-20%
- C. 20-25 %
- D. 25-30 % Discuss
Correct Answer: 20-25 %
- 6. Cider vinegar is produced from
Options- A. fruit juices
- B. malted grain
- C. ethanol
- D. ale Discuss
Correct Answer: fruit juices
- 7. What is the pH of the medium when sucrose is used as substrate for the production of citric acid?
Options- A. 3
- B. 4
- C. 5
- D. 6 Discuss
Correct Answer: 3
- 8. In submerged 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
Correct Answer: Fungal mycelium grows through out the solution in a deep tank
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