G2 Gas Fitter Exam 2025 – 400 Free Practice Questions to Pass the Exam

A continuous ignition source is the correct choice because it operates throughout the entire duration that the flame is present. This means that as long as the flame is active, the ignition source remains engaged, ensuring a steady and reliable ignition.

In contrast, an intermittent ignition source only activates at specific times, typically when the system is starting up or when there is a need to reignite a flame, but it does not remain on continuously. An intermittent pilot serves a similar purpose; it lights the main burner when needed but isn't active the entire time the main flame is present. An interrupted ignition source would imply that the ignition is not consistent, turning off during certain phases of operation, further emphasizing the need for a stable source for continuous flame.

Understanding the different types of ignition sources is crucial for safe and efficient gas fitting practice, ensuring that systems function properly and reduce risks associated with gas appliances.