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MCQs

Total Questions : 40 | Page 2 of 4 pages
Question 11. In submerged process for the fermentation to produce citric acid,
  1.    Fungal mycelium grows through out the solution in a deep tank
  2.    A. niger is used with solid substrate as sweet potato
  3.    A. niger floats on the surface of solution
  4.    both (a) and (b)
 Discuss Question
Answer: Option A. -> Fungal mycelium grows through out the solution in a deep tank
Question 12. Alegar is a type of vinegar produced from
  1.    fruit juices
  2.    ethanol
  3.    malted grain
  4.    ale
 Discuss Question
Answer: Option D. -> ale
Question 13. Vinegar production consists of
  1.    aerobic fermentation followed by anaerobic fermentation
  2.    anaerobic fermentation followed by aerobic fermentation
  3.    aerobic fermentation
  4.    anaerobic fermentation
 Discuss Question
Answer: Option B. -> anaerobic fermentation followed by aerobic fermentation
Question 14. Which substrate is used in the fermentation of citric acid?
  1.    Sucrose
  2.    Starch hydrolysate
  3.    Beet molasses
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 15. During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?
  1.    None of these
  2.    HCl
  3.    HNO3
  4.    H2SO4
 Discuss Question
Answer: Option D. -> H2SO4
Question 16. Cider vinegar is produced from
  1.    malted grain
  2.    ale
  3.    fruit juices
  4.    ethanol
 Discuss Question
Answer: Option C. -> fruit juices
Question 17. Malt vinegar is produced from
  1.    ale
  2.    ethanol
  3.    malted grain
  4.    fruit juices
 Discuss Question
Answer: Option C. -> malted grain
Question 18. Ethanol is oxidized to acetic acid aerobically using
  1.    both (a) and (b)
  2.    Lactobacillus
  3.    Gluconobacter
  4.    Acetobacter
 Discuss Question
Answer: Option A. -> both (a) and (b)
Question 19.  Vinegar is typically produced in fed batch reactors because
  1.    a fed batch reactor can be used to maintain low acetic acid concentrations
  2.    a fed batch reactor can be used to maintain low ethanol concentrations
  3.    acetic acid bacteria tend to ferment at high ethanol concentrations
  4.    all of the above
 Discuss Question
Answer: Option B. -> a fed batch reactor can be used to maintain low ethanol concentrations
Question 20.  What is the pH of the medium when sucrose is used as substrate for the production of citric acid?
  1.    3
  2.    4
  3.    5
  4.    6
 Discuss Question
Answer: Option A. -> 3

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