🔍 Key Concepts

• Coil-type auxiliary water-tube boiler construction and flow path • Difference between where water becomes steam vs. where water collects • How coil-type boilers respond to changes in steam demand compared with fire-tube boilers

💭 Think About

• Visualize the path of the feedwater: Where does it enter, where is it heated, and at what point does it change phase from water to steam? • Think about what makes coil-type boilers popular as auxiliary or package boilers: is their steam demand response typically faster or slower than a fire-tube boiler? • Which options describe what happens inside the coils versus what might happen in a separate chamber or drum?

✅ Before You Answer

• Identify in which part of a coil-type boiler the actual flashing to steam occurs (inside the coils or in a separate flash chamber). • Recall whether coil-type boilers are known for quick or slow response to load changes compared with fire-tube boilers. • Check each option against the basic design: coil of small tubes with high circulation, no large steam drum. Eliminate statements that imply a large drum or stored water mass.