Question 282Steam 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 fitted with rotary cup atomizers, the combustion control system will increase the fuel oil control valve opening. This is done to increase the fuel supply to the boiler, which will raise the steam pressure back to the desired level.
The other options are incorrect because: B) increasing the rotary cup speed would increase the air-fuel ratio, not the fuel supply; C) decreasing the back pressure regulating valve opening would decrease the steam pressure, not increase it; and D) decreasing the supply steam control valve opening would reduce the steam pressure, not increase it.
Related Questions
#280 In a regenerative air heater, air is bypassed around the heater while _______________.#281 A variable capacity, pressure atomizing, fuel oil burner functions to _______________.#283 The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler are automatically closed by _______________.#284 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? #285 The unit shown in the illustration is used as the _______________ Illustration SG-0025