Question 255Steam Plants - Assistant Engineer70% to pass
The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler are automatically closed by _______________.
AI Explanation
The correct answer is C) high steam pressure.
The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler are automatically closed by high steam pressure. This is a safety mechanism to prevent overpressurization of the boiler system. When the steam pressure rises above a certain threshold, the solenoid valves will automatically shut off the fuel supply to the boiler, stopping the combustion process and preventing potential damage or explosion.
The other options are incorrect because they do not directly trigger the automatic closure of the fuel oil supply solenoid valves. A decrease in feed temperature (A), high furnace air pressure (B), or low steam pressure (D) may have other effects on the boiler system, but they do not directly cause the fuel oil supply to be shut off in the same way that high steam pressure does.
Related Questions
#253 Under EMERGENCY operating conditions, the proper valve positions for controlling feed water to the boiler should be the _______________.#254 One boiler of a two boiler plant has ruptured a tube and the water cannot be maintained in sight in the gage glass. After securing the fires, your next action should be to _______________.#256 When the steam pressure drops below a set value on an automatically fired auxiliary boiler, fitted with rotary cup atomizers, the combustion control system will _______________.#257 A variable capacity, pressure atomizing, fuel oil burner functions to _______________.#258 Control of the fuel oil metering valve in an automatically fired auxiliary boiler is accomplished by a _______________.