Question 182Motor Plants - 1st Asst/Chief

The correct answer is D) automatically regulates the quantity of oil and air flow to the burner. The pressuretrol is a safety device installed on an auxiliary boiler that senses changes in steam pressure. When the steam pressure rises or falls, the pressuretrol automatically adjusts the quantity of oil and air flow to the burner to maintain the desired steam pressure. This allows the boiler to operate safely and efficiently without requiring manual adjustments. The other answer choices are incorrect because they do not accurately describe the primary function of the pressuretrol. The pressuretrol does not control the flow of feedwater (A), monitor the boiler high water level (B), or secure the fires when a fusible plug burns out (C).