Ethanol Production MCQs

Question 1

If starch containing substrates are used for ethanol production, yeast strain can't be used directly because

Accepted Answer

it doesn't contain amylases to hydrolyze starch

Answer

starch is not a suitable substrate for the production of ethanol

Answer

it is converted to pentose sugar

Answer

none of the above

Question 2

Which of the following is used to check vortex and to improve aeration efficiency in a fermentor?

Accepted Answer

Baffles

Answer

Impeller

Answer

Sparger

Answer

All of these

Question 3

What are different substrates used for ethanol production?

Accepted Answer

All of the above

Answer

Starch containing substrate

Answer

Juices from sugarcane or molasses or sugar beet

Answer

Waste product from wood or processed wood

Question 4

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

Accepted Answer

Sparger

Answer

Impeller

Answer

Baffles

Answer

All of these

Question 5

Ethanol is produced by

Accepted Answer

both (a) and (b)

Answer

continuous fermentation

Answer

batch fermentation

Answer

none of these

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

Accepted Answer

as single cell protein for animal feed

Answer

for next fermentation

Answer

as manure

Answer

all of the above

Question 7

The fermentor can be sterilized by

Accepted Answer

steam under pressure

Answer

keeping it in the oven

Answer

boiling

Answer

all of these

Question 8

Candida utilis is used for the fermentation of waste sulphate liquor since it ferments

Accepted Answer

both hexoses and pentoses

Answer

hexoses only

Answer

pentoses only

Answer

none of these

Question 9

Yeast is used in the production of

Accepted Answer

ethyl alcohol

Answer

acetic acid

Answer

cheese

Answer

curd