Ethanol Production MCQs : This section focuses on the "Ethanol Production". These Multiple Choice Questions (MCQs) should be practiced to improve the Ethanol Production skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
If starch containing substrates are used for ethanol production, yeast strain can't be used directly because
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
Question 2
Which of the following is used to check vortex and to improve aeration efficiency in a fermentor?
A. Impeller
B. Baffles
C. Sparger
D. All of the above
Question 3
What are different substrates used for ethanol production?
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
Question 4
Which of the following is used for aeration in a fermentor?
A. Impeller
B. Baffles
C. Sparger
D. All of the above
Question 5
Ethanol is produced by
A. continuous fermentation
B. batch fermentation
C. Both A and B
D. None of the above
Question 6
As the fermentation for the ethanol production is over, the cells are separated to get the biomass of yeast cells that is used
A. for next fermentation
B. as single cell protein for animal feed
C. as manure
D. All of the above
Question 7
The fermentor can be sterilized by
A. keeping it in the oven
B. steam under pressure
C. boiling
D. All of the above
Question 8
Candida utilis is used for the fermentation of waste sulphate liquor since it ferments
A. hexoses only
B. pentoses only
C. both hexoses and pentoses
D. None of the above
Question 9
Yeast is used in the production of
A. ethyl alcohol
B. acetic acid
C. cheese
D. curd
Question 10
S cerevisiae start producing ethanol with in
A. 10 h
B. 12 h
C. 15 h
D. 24 h
Question 11
Which of the following microorganisms help in the ethanol production?
A. Saccharomyces cerevisiae
B. Zygomonas mobilis
C. Saccharomyces uvarum
D. All of the above
Question 12
After the fermentation is over, ethanol is recovered by
A. centrifugation
B. distillation
C. filtration
D. cell disintegration
Question 13
The Zygomonas has a merit over yeast because
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
Question 14
Which of the following organism is not used in any of the traditional industrial fermentation?
A. E. coli
B. Yeast
C. Bacillus
D. Pseudomonas
Question 15
How is air supply to the fermentor sterilized?
A. By heat filtration
B. Filtration through fibrous material
C. Filtration through granular material
D. All of the above
Question 16
What are the fermentation conditions for the 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
Question 17
Which of the following is used for agitation in a fermentor?
A. Impeller
B. Baffles
C. Sparger
D. All of the above
Question 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 the above
Question 19
High ethanol concentration
A. promotes yeast growth
B. inhibits yeast growth
C. promotes bacterial growth
D. inhibits bacterial growth
Question 20
Candida utilis is used for the fermentation of waste sulphate liquor since it ferments
A. hexoses only
B. pentoses only
C. both hexoses and pentoses
D. none of these
Question 21
Ethanol is produced by
A. continuous fermentation
B. batch fermentation
C. both (a) and (b)
D. none of these
Question 22
The fermentor can be sterilized by
A. keeping it in the oven
B. steam under pressure
C. boiling
D. all of these
Question 23
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
Question 24
Which of the following is used for aeration in a fermentor?
A. Impeller
B. Baffles
C. Sparger
D. All of these
Question 25
Which of the following is used for agitation in a fermentor?
A. Impeller
B. Baffles
C. Sparger
D. All of these
Question 26
Which of the following is used to check vortex and to improve aeration efficiency in a fermentor?
A. Impeller
B. Baffles
C. Sparger
D. All of these
Question 27
Which of the following microorganisms help in the ethanol production?
A. Saccharomyces cerevisiae
B. Zygomonas mobilis
C. Saccharomyces uvarum
D. All of these