VINEGAR AND CITRIC ACID QUIZ

Which of the following microorganism is used for the production of citric acid?

Streptococcus lactis

Lactobacillus bulgaricus

Saccharomyces cerevisiae

Aspergillus niger

TRUE ANSWER : ?
YOUR ANSWER : ?

Which substrate is used in the fermentation of citric acid?

Sucrose

All of these

Starch hydrolysate

Beet molasses

TRUE ANSWER : ?
YOUR ANSWER : ?

Sugar content of the fermentation medium for citric acid is maintained at

10-15%

15-20%

25-30 %

20-25 %

TRUE ANSWER : ?
YOUR ANSWER : ?

Ethanol is oxidized to acetic acid aerobically using

Gluconobacter

Lactobacillus

both (a) and (b)

Acetobacter

TRUE ANSWER : ?
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During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?

HNO3

None of these

H2SO4

HCl

TRUE ANSWER : ?
YOUR ANSWER : ?

In koji process for the fermentation to produce citric acid,

Fungal mycelium grows through out the solution in a deep tank

A. niger is used with solid substrate as sweet potato

both (a) and (b)

A. niger floats on the surface of solution

TRUE ANSWER : ?
YOUR ANSWER : ?

Spirit vinegar is produced from

ethanol

fruit juices

malted grain

ale

TRUE ANSWER : ?
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Which of the following nitrogen sources is added in the fermentation medium of citric acid production?

Both (a) and (b)

Urea

Peptone

Ammonium salt

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the pH of the medium when molasses is used as substrate for the production of citric acid?

6

4

5

3

TRUE ANSWER : ?
YOUR ANSWER : ?

In submerged process for the fermentation to produce citric acid,

Fungal mycelium grows through out the solution in a deep tank

A. niger is used with solid substrate as sweet potato

both (a) and (b)

A. niger floats on the surface of solution

TRUE ANSWER : ?
YOUR ANSWER : ?