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Difficulty: EasyExhaust Emissions and Noise Abatement

What is the primary function of a catalytic converter fitted to a vehicle's exhaust system?

  1. A
    To enable the driver to coast safely in neutral without stalling the engine
  2. To convert and reduce harmful toxic gases before they are released into the atmosphereAnswer
  3. C
    To automatically reset dashboard warning lights when exhaust temperature increases
  4. D
    To exempt the vehicle from statutory MOT exhaust emissions testing standards

Answer

To convert and reduce harmful toxic gases before they are released into the atmosphere
A catalytic converter is incorporated into a vehicle's exhaust system to reduce environmental pollution. It contains precious metals that act as catalysts to convert harmful exhaust pollutants, such as carbon monoxide and nitrogen oxides, into less hazardous gases before they exit into the atmosphere.

Step-by-Step Solution

1
Identify the purpose of vehicle emissions control components.
Internal combustion engines generate toxic by-products such as carbon monoxide, nitrogen oxides, and unburnt hydrocarbons.
Exhaust emissions must be chemically treated before entering the environment to protect air quality and public health.
2
Determine the specific function of the catalytic converter.
The catalytic converter promotes chemical reactions that transform toxic pollutants into less harmful substances like water vapour, carbon dioxide, and nitrogen.
This defines the primary environmental and mechanical role of a catalytic converter on road vehicles.

Key Concept

Function and environmental role of a vehicle catalytic converter
Estimated Time:45s
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Topics

Exhaust Emissions and Noise Abatement

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