Ethanol Production – Section 1

16. What are the fermentation conditions for ethanol production?

A. pH 6; temperature 35°C
B. pH 5; temperature 35°C
C. pH 6; temperature 30°C
D. pH 5; temperature 30°C

Correct Answer: B. pH 5; temperature 35°C

17. Which of the following is used for agitation in a fermentor?

A. Impeller
B. Baffles
C. Sparger
D. All of these

Correct Answer: A. Impeller

18. To maintain aseptic conditions during fermentation which of the following is needed?

A. Sterilization of fermentor
B. Sterilization of air supply
C. Aeration and agitation
D. All of these

Correct Answer: D. All of these

19. High ethanol concentration

A. promotes yeast growth
B. inhibits yeast growth
C. promotes bacterial growth
D. inhibits bacterial growth

Correct Answer: B. inhibits yeast growth

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