How would you define intermittent ignition?

Intermittent ignition refers specifically to a system where the spark ignites the fuel at the start of the burner operation and then turns off after the ignition process is successfully completed. In this context, an intermittent ignition system typically remains off during the burner operation once the fuel has ignited, as the ignition source is no longer needed to maintain the flame. When the system needs to restart, the spark will activate again momentarily, which is consistent with the term "intermittent."

In the context of this question, the correct understanding is that the spark is indeed on at the beginning for ignition but does not stay on throughout the entire burning cycle. This dynamic allows for efficient operation and energy saving, as the spark is only used when necessary to ignite the fuel, complicating the responsibilities of the burner system during operation.

The other definitions may misrepresent the function of intermittent ignition by implying continuous spark or by suggesting the spark serves no function in the ignition process at various stages of burner operation.