ASVAB · Ignition and Fuel Systems

What is the purpose of the catalytic converter in the exhaust system?

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Correct answer

To reduce harmful emissions by converting toxic exhaust gases into less harmful substances

A To increase engine power
B To reduce harmful emissions by converting toxic exhaust gases into less harmful substances
C To cool the engine
D To store fuel

Why this is the answer

The catalytic converter is part of the exhaust system that reduces harmful emissions. It uses precious-metal catalysts to convert toxic gases — carbon monoxide, unburned hydrocarbons, and nitrogen oxides — into less harmful substances like carbon dioxide, water vapor, and nitrogen before they leave the tailpipe. Catalytic converters are required for emissions control on modern gasoline vehicles. A failing converter can trigger a check-engine light and cause performance problems. Understanding the catalytic converter's role in cleaning exhaust is part of the fuel-and-emissions content on the Auto subtest.

Source: ASVAB Auto Information — Catalytic Converter

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About this topic: Ignition and Fuel Systems

Ignition and fuel questions cover how spark plugs, coils and the firing order deliver a spark at the right moment, and how fuel injection, pumps and filters deliver fuel. Symptoms of a fault in each system are a favourite question type. This is one of 8 Auto Information questions on ignition and fuel systems, each with a full explanation on a single study page.

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What is the purpose of the catalytic converter in the exhaust system?

Why this is the answer

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About this topic: Ignition and Fuel Systems

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