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

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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 these

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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

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4. Which of the following is used for aeration in a fermentor?
A.Impeller
B.Baffles
C.Sparger
D.All of these

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5. Ethanol is produced by
A.continuous fermentation
B.batch fermentation
C.both (a) and (b)
D.none of these

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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

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7. 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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