Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are __________.

Correct Answer: Option D — cycled on and off in response to steam demand

Constant capacity burners lack the mechanical ability to modulate fuel flow. To accommodate varying steam demands, the burner management system must cycle the burner on and off. This maintains boiler pressure within a set range, as the burner cannot adjust its firing rate to match the load continuously.