🔍 Key Concepts

• End point of combustion in a boiler furnace (what it actually refers to in boiler design and firing practice) • Difference between complete combustion vs. maximum steam generation capacity • Relationship between firing rate, heat transfer to tubes, and burner/sprayer plate capacity

💭 Think About

• Ask yourself: does 'end point of combustion' describe a visible symptom like smoke and panting, or a design/thermal limit inside the furnace? • Which choice talks about what happens even if you keep increasing the firing rate but don’t get any more useful heat into the water/steam? • Which options are talking about the boiler as a whole (steam output) versus the specific burner/furnace combustion process?

✅ Before You Answer

• Identify which choice deals specifically with heat transfer in the furnace/tubes, not just total steam output or mechanical limits. • Eliminate any option that describes abnormal or faulty operation rather than a designed limit condition. • Check which answer describes a point of diminishing returns where more fuel does not increase effective furnace heat transfer.