Question 82Steam Plants - Assistant Engineer
70% to passCarbon dioxide dissolved in boiler water is dangerous in a modern power boiler because the gas _______________.
Aforms carbonic acid which attacks the watersides
Bcombines with sulfates to cause severe waterside pitting
Cbreaks the magnetic iron oxide film inside boiler tubes
Dcombines with oxygen to cause severe waterside scaling
AI Explanation
The correct answer is A) forms carbonic acid which attacks the watersides. When carbon dioxide (CO2) dissolves in boiler water, it forms carbonic acid (H2CO3). This carbonic acid can be corrosive to the internal surfaces (watersides) of the boiler, potentially leading to pitting and other damage over time. This is why the presence of dissolved CO2 in boiler water is considered dangerous in modern power boilers. The other answer options are incorrect because they do not accurately describe the primary risk posed by dissolved CO2 in boiler water. Options B, C, and D describe different boiler water chemistry issues that are not directly caused by the presence of dissolved CO2.
Related Questions
Q2:A combustion control system diaphragm type air flow transmitter receives its hig... Q294:According to Coast Guard Regulations Q84:The concentration of total dissolved solids in the boiler water can increase as ... Q305:Insufficient combustion air supply will cause an atomizer flame to appear as a _... Q648:Which of the following is used to hold the poppet valves closed in a turbo-gener...
Ready to test your knowledge?
Take a Steam Plants - Assistant Engineer Practice ExamOfficial Resources