Question 316Steam Plants - Assistant Engineer

The correct answer is A) steam header pressure. In an automatically fired boiler, the steam pressure regulator controls the supply of fuel oil to the burners by responding to variations in the steam header pressure. The steam pressure regulator is designed to maintain a constant steam pressure by adjusting the fuel oil supply to the burners. As the steam header pressure fluctuates, the regulator will increase or decrease the fuel oil flow to the burners to keep the pressure stable. The other options are incorrect because they do not directly control the fuel oil supply. The burner flame intensity, steam drum water level, and master fuel oil solenoid valve position may influence the boiler operation, but they are not the primary control parameter for the fuel oil supply regulated by the steam pressure controller.