Compressed Natural Gas (CNG) Certification Practice Exam

Question: 1 / 400

What is Compressed Natural Gas (CNG) primarily composed of?

Ethane (C2H6)

Butane (C4H10)

Methane (CH4)

Compressed Natural Gas (CNG) is primarily composed of methane (CH4). Methane is the simplest hydrocarbon and is the main component of natural gas, making up approximately 70% to 90% of CNG's composition. The use of methane in CNG is significant because it is cleaner-burning than other fossil fuels, which means its combustion produces fewer pollutants, such as carbon monoxide and particulate matter. This characteristic contributes to the environmental benefits of CNG as a fuel alternative for vehicles and other applications. Additionally, the physical properties of methane allow it to be compressed efficiently, making it suitable for storage and transportation.

Understanding the composition of CNG is vital for those involved in the energy and transportation sectors, as it highlights the reasons behind its use, safety considerations, and environmental impact.

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Propane (C3H8)

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