Gas Fitter Practice Test

What is the ultimate CO2 level for propane gas?

1. 9.9%

2. 10.9%

3. 11.9%

4. 13.9%

The correct answer is: 13.9%

The ultimate CO2 level for propane gas is recognized as 13.9%. This figure is significant because it reflects the complete combustion of propane, which ideally produces carbon dioxide, water, and heat. When propane combusts perfectly with the correct air-fuel mixture, this level of CO2 is expected as a product. Understanding combustion efficiency is crucial for gas fitters, as it impacts safety and equipment performance. Incomplete combustion, which occurs with insufficient oxygen, may lead to lower CO2 levels and the formation of carbon monoxide, a dangerous gas. Thus, achieving the correct CO2 level is essential for ensuring that appliances operate efficiently and safely. It is also indicative of maintaining proper adjustments to gas burners and overall system performance.