Question 178Motor Plants - 1st Asst/Chief70% 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 action increases the fuel supply to the boiler, which helps to restore the steam pressure to the desired level.
The other options are incorrect because: B) increasing the rotary cup speed would not directly increase the fuel supply, C) decreasing the back pressure regulating valve opening would restrict the steam flow, and D) decreasing the supply steam control valve opening would reduce the steam supply, which would further decrease the steam pressure.
Related Questions
#176 A variable capacity, pressure atomizing, fuel oil burner functions to_______________.#177 Which of the following statements describes how the fuel oil enters the whirling chambers of the sprayer plates used in a auxiliary boiler return flow fuel oil system? #179 Control of the fuel oil metering valve in an automatically fired auxiliary boiler is accomplished by a _______________.#180 The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler, are automatically closed by _______________.#181 Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are_______________.