Question 256Steam Plants - Assistant Engineer70% to pass
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 _______________.
AI Explanation
The correct answer is A) increase the fuel oil control valve opening.
When the steam pressure drops below a set value on an automatically fired auxiliary boiler with rotary cup atomizers, the combustion control system will increase the fuel oil control valve opening. This is because the decrease in steam pressure indicates a drop in boiler output, so the control system needs to increase the fuel supply to the boiler to maintain the desired steam pressure.
The other options are incorrect because: B) increasing the rotary cup speed would be an unnecessary step, C) decreasing the back pressure regulating valve opening would restrict the steam flow instead of increasing it, and D) decreasing the supply steam control valve opening would also restrict the steam flow, which is the opposite of what is required to maintain the steam pressure.
Related Questions
#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 _______________.#255 The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler are automatically closed by _______________.#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 _______________.#259 Which of the following statements describes how the fuel oil enters the whirling chambers of the sprayer plates used in an auxiliary boiler return flow fuel oil system?