🔍 Key Concepts

• Coil-type auxiliary water-tube boiler construction – how water and steam flow through coils instead of large drums • Steam separation method – where and how steam is separated from water in this design • Difference between steam generation and steam storage in auxiliary boilers

💭 Think About

• Think about what function a large steam drum normally serves in a water-tube boiler. How is that function handled differently in a coil-type boiler? • Which choice describes a specific physical component or process that can replace the need for a large drum, rather than talking generally about pressure, combustion heat, or automatic controls? • Ask yourself: which option explains where or how the steam is separated from the water in this particular boiler design?

✅ Before You Answer

• Identify the primary purpose of a steam drum (steam-water separation and storage) and see which option addresses that directly. • Eliminate any answers that rely only on combustion intensity, low pressure, or automatic controls, because those do not physically replace the separation/storage function of a drum. • Look for wording that suggests a mechanical/structural feature of the coil-type boiler that can perform steam-water separation without a large steam drum.