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Questions and Answers
What is the goal set by the U.S. Department of Energy for substituting gasoline with biofuels by 2030?
What is the goal set by the U.S. Department of Energy for substituting gasoline with biofuels by 2030?
- 40%
- 30% (correct)
- 10%
- 20%
Why must ethanol be distilled 2× before use?
Why must ethanol be distilled 2× before use?
- To improve its shelf life
- To increase its energy content
- To remove water (correct)
- To remove impurities
How is ethanol primarily produced for use as a biofuel?
How is ethanol primarily produced for use as a biofuel?
- By using crop residues to ferment cellulose
- By microbial fermentation of plant starches in corn (correct)
- By mixing with existing petroleum-based fuels
- By distillation of crude oil
What is one disadvantage of using crop residues (waste material) to ferment cellulose for biofuel production?
What is one disadvantage of using crop residues (waste material) to ferment cellulose for biofuel production?
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Why is ethanol considered to have drawbacks as a biofuel?
Why is ethanol considered to have drawbacks as a biofuel?
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