G2 Gas Fitter Practice Exam

What principle does a filament CGI unit operate on?

1. Catalytic combustion

2. Conduction heating

3. Induction heating

4. Radiant heating

The correct answer is: Catalytic combustion

A filament CGI (Ceramic Gas Ignition) unit operates on the principle of catalytic combustion. This technology utilizes a catalyst to lower the ignition temperature of fuel, allowing it to burn more efficiently and cleanly. The catalytic process occurs at a lower temperature than traditional combustion methods, leading to reduced emissions and increased energy efficiency. In a filament CGI unit, the catalyst aids in igniting the gas as it passes over the heated surface, allowing for more effective fuel utilization and a more stable flame. This method ensures that the combustion process is not only effective but also environmentally friendly, aligning with modern energy standards for reduced pollution. The other principles listed, such as conduction heating, induction heating, and radiant heating, refer to different methods of heat transfer and generation. Conduction heating involves direct heat transfer through materials, induction heating relies on electromagnetic fields to generate heat directly in conductive materials, and radiant heating involves transferring heat through infrared radiation. While these methods are significant in various heating applications, they do not pertain to the unique operation of a filament CGI unit, which focuses specifically on catalysis and efficient gas combustion.