247SimpleTests
ASVAB · General

What is the purpose of the catalytic converter in a vehicle's exhaust system?

Correct answer

Reduces harmful exhaust emissions by converting carbon monoxide, hydrocarbons, and nitrogen oxides into less harmful gases (CO2, H2O, N2)

  1. A Increases engine power
  2. B Reduces harmful exhaust emissions by converting carbon monoxide, hydrocarbons, and nitrogen oxides into less harmful gases (CO2, H2O, N2)
  3. C Improves fuel mileage
  4. D Reduces engine noise

Why this is the answer

The CATALYTIC CONVERTER uses platinum, palladium, and rhodium catalysts to convert three major pollutants: Carbon Monoxide (CO) → Carbon Dioxide (CO2); Unburned Hydrocarbons (HC) → CO2 + H2O; Nitrogen Oxides (NOx) → Nitrogen (N2) + O2. Required on all US vehicles since 1975. Damage signs: rattling (damaged internal substrate), sulfur/rotten egg smell (running rich), or check engine light (P0420/P0430 codes). Catalytic converters are stolen for the precious metals inside.
Source: ASVAB AI, Emissions Systems

Practice more questions

This question is from our ASVAB Practice Tests practice test. Take the full practice test to test your knowledge across all General and other topics.

Take the Auto Information practice test →

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

Related questions

General

What does a thermostat regulate in a vehicle's cooling system?

 General

What is the function of the alternator in a vehicle?

 General

What does 'MPG' stand for?

 General

Which component converts fuel vapor and air into the combustible mixture in an older carbureted engine?

Recommended study materials

Study guide

ASVAB Total Prep 2024–2025 (Kaplan)

Kaplan's complete ASVAB guide with 1,000+ practice questions, 6 full-length tests, and AFQT focus.

Check Price → Study guide

Barron's ASVAB with Online Tests 12th Ed.

Comprehensive ASVAB review for all nine subtests with full-length practice exams and online tools.

Check Price → Study guide

ASVAB for Dummies 4th Ed. (Wiley)

Accessible, thorough ASVAB prep covering all subtests with tips for boosting your AFQT score.

Check Price →

As an Amazon Associate, CJ Affiliate, and AWIN publisher we earn from qualifying purchases. Links above are affiliate links. Full disclosure →