Vehicle Emissions

What is the main role of the carbon canister in a vehicle?

• To store liquid fuel

• To absorb hydrocarbon vapors

• To cool the engine

• To increase fuel efficiency

How does the PCV system help in emission control?

• By increasing engine power

• By reducing fuel consumption

• By removing excess blow-by gases

• By storing fuel vapors

What happens to hydrocarbon emissions during combustion?

• They are absorbed by the engine oil

• They are stored in the fuel tank

• They are released into the atmosphere

• They are burned with the air-fuel charge

What is a major cause of carbon monoxide formation in engines?

• Excessive oxygen in the intake

• Low engine speed

• Rich air-fuel mixtures

• High combustion temperatures

Which system is commonly used to control NOx emissions in heavy vehicles?

• Fuel injection system

• Positive crankcase ventilation

• Selective catalyst reduction

• Carbon canister