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- Question
After the fermentation is over, ethanol is recovered by
Options- A. centrifugation
- B. distillation
- C. filtration
- D. cell disintegration
- Correct Answer
- distillation
- 1. What are different substrates used for ethanol production?
Options- A. Starch containing substrate
- B. Juices from sugarcane or molasses or sugar beet
- C. Waste product from wood or processed wood
- D. All of the above Discuss
- 2. 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
- 3. High ethanol concentration
Options- A. promotes yeast growth
- B. inhibits yeast growth
- C. promotes bacterial growth
- D. inhibits bacterial growth Discuss
- 4. 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
- 5. 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
- 6. Which of the following is used for agitation in a fermentor?
Options- A. Impeller
- B. Baffles
- C. Sparger
- D. All of these Discuss
- 7. Yeast is used in the production of
Options- A. ethyl alcohol
- B. acetic acid
- C. cheese
- D. curd Discuss
- 8. The fermentor can be sterilized by
Options- A. keeping it in the oven
- B. steam under pressure
- C. boiling
- D. all of these Discuss
- 9. How is air supply to the fermentor sterilized?
Options- A. By heat filtration
- B. Filtration through fibrous material
- C. Filtration through granular material
- D. All of the above Discuss
- 10. Which of the following organism is not used in any of the traditional industrial fermentation?
Options- A. E. coli
- B. Yeast
- C. Bacillus
- D. Pseudomonas Discuss
Ethanol Production problems
Search Results
Correct Answer: All of the above
Correct Answer: All of these
Correct Answer: inhibits yeast growth
Correct Answer: it doesn't contain amylases to hydrolyze starch
Correct Answer: all of the above
Correct Answer: Impeller
Correct Answer: ethyl alcohol
Correct Answer: steam under pressure
Correct Answer: All of the above
Correct Answer: E. coli
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