Ethanol Production problems
- 1. To maintain aseptic conditions during fermentation which of the following is needed?
Options- A. Sterilization of fermentor
- B. Sterilization of air supply
- C. Aeration and agitation
- D. All of these Discuss
Correct Answer: All of these
- 2. S cerevisiae start producing ethanol with in
Options- A. 10 h
- B. 12 h
- C. 15 h
- D. 24 h Discuss
Correct Answer: 12 h
- 3. Which of the following is used to check vortex and to improve aeration efficiency in a fermentor?
Options- A. Impeller
- B. Baffles
- C. Sparger
- D. All of these Discuss
Correct Answer: Baffles
- 4. As the fermentation for the ethanol production is over, the cells are separated to get the biomass of yeast cells that is used
Options- A. for next fermentation
- B. as single cell protein for animal feed
- C. as manure
- D. all of the above Discuss
Correct Answer: as single cell protein for animal feed
- 5. Which of the following is used for aeration in a fermentor?
Options- A. Impeller
- B. Baffles
- C. Sparger
- D. All of these Discuss
Correct Answer: Sparger
- 6. What are the fermentation conditions for the ethanol production?
Options- A. pH 6; temperature 35°C
- B. pH 5; temperature 35°C
- C. pH 6; temperature 30°C
- D. pH 5; temperature 30°C Discuss
Correct Answer: pH 5; temperature 35°C
- 7. The Zygomonas has a merit over yeast because
Options- A. it has more osmotic tolerance to higher sugar concentration
- B. it has high tolerance to ethanol
- C. it has more specific growth rate
- D. all of the above Discuss
Correct Answer: all of the above
- 8. If starch containing substrates are used for ethanol production, yeast strain can't be used directly because
Options- A. it doesn't contain amylases to hydrolyze starch
- B. starch is not a suitable substrate for the production of ethanol
- C. it is converted to pentose sugar
- D. none of the above Discuss
Correct Answer: it doesn't contain amylases to hydrolyze starch
- 9. High ethanol concentration
Options- A. promotes yeast growth
- B. inhibits yeast growth
- C. promotes bacterial growth
- D. inhibits bacterial growth Discuss
Correct Answer: inhibits yeast growth
- 10. Which of the following microorganisms help in the ethanol production?
Options- A. Saccharomyces cerevisiae
- B. Zygomonas mobilis
- C. Saccharomyces uvarum
- D. All of these Discuss
Correct Answer: All of these
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