Question 372General Subjects - 1st Asst/Chief

The correct answer is B) Prepurge, ignition, postpurge, and modulation. According to 46 CFR regulations, the safety programming controls of automatic auxiliary boilers must be checked for proper operation, sequencing, and timing of the prepurge, ignition, postpurge, and modulation functions. The prepurge function clears the combustion chamber of any residual gases, the ignition function lights the burner, the postpurge function clears the chamber after combustion, and the modulation function controls the fuel-air mixture. Checking all these functions is necessary to ensure the safe and proper operation of the automatic boiler system. The other options are incorrect because they do not include all the required functions that must be checked per the regulations.