Understanding Ethanol as a Fuel

What is the primary source of ethanol in the U.S.?

• Corn

• Rice

• Sugarcane

• Wheat

What percentage of ethanol is found in E10 fuel?

• 50%

• 85%

• 20%

• 10%

Which vehicles can use E10 fuel without modifications?

• Hybrid vehicles

• Only diesel vehicles

• Only electric vehicles

• All gasoline vehicles

What is the environmental benefit of using ethanol as a fuel?

• Causes acid rain

• Increases carbon dioxide

• Reduces air pollution

• Depletes oxygen levels

What is the main advantage of using ethanol-blended gasoline?

• It requires no engine modifications

• It is cheaper than pure gasoline

• It colors the fuel for safety

• It increases vehicle speed

What does the 'E' in E10 stand for?

• Efficiency

• Energy

• Environment

• Ethanol

How many fueling stations in the U.S. offer E85 pumps?

• Over 5,000

• About 100

• Less than 500

• Over 2,700

What is the role of yeast in the production of ethanol?

• Fermentation of sugars and starch

• Coloring the ethanol

• Reducing the ethanol potency

• Increasing the fuel's octane rating