FREE SCT Emission Control Systems & Components Questions and Answers

Question 1

What is the primary function of an EGR (Exhaust Gas Recirculation) valve?

Accepted Answer

Reduce NOx emissions

Answer

Improve engine noise

Answer

Reduce fuel consumption

Answer

Lower engine temperature

Question 2

Which component stores fuel vapors and prevents them from escaping into the atmosphere?

Accepted Answer

Charcoal canister

Answer

PCV valve

Answer

Fuel injector

Answer

Catalytic converter

Question 3

What does the oxygen sensor monitor in the exhaust system?

Accepted Answer

Air-fuel mixture

Answer

Engine oil level

Answer

Coolant temperature

Answer

Spark timing

Question 4

Which part of the emission system is responsible for converting harmful gases into less harmful ones?

Accepted Answer

Catalytic converter

Answer

Fuel tank

Answer

Air filter

Answer

Throttle body

Question 5

What does the EVAP system prevent?

Accepted Answer

Fuel vapor emissions

Answer

Oil leaks

Answer

Coolant loss

Answer

Exhaust noise

Question 6

What is the role of the air injection system?

Accepted Answer

Reduce emissions

Answer

Increase engine power

Answer

Cool down the engine

Answer

Add oxygen to the combustion process

Question 7

Which gas is specifically reduced by the EGR system?

Accepted Answer

Nitrogen oxide

Answer

Carbon dioxide

Answer

Oxygen

Answer

Hydrogen

Question 8

What could a failed oxygen sensor cause?

Accepted Answer

Check engine light and poor MPG

Answer

Better gas mileage

Answer

Reduced emissions

Answer

Increased horsepower

Question 9

Which component can trigger a check engine light if it malfunctions in the emission system?

Accepted Answer

Catalytic converter

Answer

Windshield wipers

Answer

Battery

Answer

Horn