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Ethanol Production MCQ Questions & Answers

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

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

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Question 2

Which of the following is used for aeration in a fermentor?

A. Impeller
B. Baffles
C. Sparger
D. All of the above

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Question 3

The fermentor can be sterilized by

A. keeping it in the oven
B. steam under pressure
C. boiling
D. all of these

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Question 4

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

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Question 5

The fermentor can be sterilized by

A. keeping it in the oven
B. steam under pressure
C. boiling
D. All of the above

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Question 6

Which of the following microorganisms help in the ethanol production?

A. Saccharomyces cerevisiae
B. Zygomonas mobilis
C. Saccharomyces uvarum
D. All of these

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Question 7

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

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

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Question 8

S cerevisiae start producing ethanol with in

A. 10 h
B. 12 h
C. 15 h
D. 24 h

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Question 9

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

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Question 10

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

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Question 11

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

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Question 12

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

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Question 13

Which of the following microorganisms help in the ethanol production?

A. Saccharomyces cerevisiae
B. Zygomonas mobilis
C. Saccharomyces uvarum
D. All of the above

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Question 14

Yeast is used in the production of

A. ethyl alcohol
B. acetic acid
C. cheese
D. curd

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Question 15

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

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Question 16

High ethanol concentration

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

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Question 17

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

A. Impeller
B. Baffles
C. Sparger
D. All of the above

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Question 18

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

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Question 19

Ethanol is produced by

A. continuous fermentation
B. batch fermentation
C. Both A and B
D. None of the above

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Question 20

After the fermentation is over, ethanol is recovered by

A. centrifugation
B. distillation
C. filtration
D. cell disintegration

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Question 21

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

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Question 22

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

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Question 23

Ethanol is produced by

A. continuous fermentation
B. batch fermentation
C. both (a) and (b)
D. none of these

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Question 24

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

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Question 25

Which of the following organism is not used in any of the traditional industrial fermentation?

A. E. coli
B. Yeast
C. Bacillus
D. Pseudomonas

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Question 26

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

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Question 27

Which of the following is used for aeration in a fermentor?

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

View Answer