Utah County Emissions Practice Test

Question: 1 / 400

What does a high percentage of HC indicate about fuel consumption?

Efficient combustion

Excess unburned fuel

A high percentage of hydrocarbons (HC) in emissions is indicative of excess unburned fuel. This occurs when the fuel-air mixture in the combustion chamber does not ignite completely, resulting in unburned hydrocarbons being released into the exhaust. When combustion is efficient, it converts fuel into energy effectively, producing minimal unburned fuel. Therefore, a high HC percentage signals that a significant portion of the fuel is not being utilized for combustion, leading to inefficiencies and increased pollution. This measure is crucial for understanding the health of an engine's combustion process and its overall performance, especially in emissions testing where regulations aim to limit pollutants like hydrocarbons.

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Low emissions

Increased efficiency

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