🔍 Key Concepts

• Trace the flow of water/steam through the system, starting at the feedwater source and ending at the turbine/generator. • Identify whether component 3 is in the water path before or after the steam drum (A/C). • Recall the difference between economizer / feedwater heater, evaporator (saturated steam), and superheater sections in a boiler or exhaust-gas heat-recovery unit.

💭 Think About

• Look at where the arrows show fluid entering and leaving component 3. Does it carry water, steam, or condensate? • Check what type of gas is passing over/through component 3 (engine exhaust, furnace gas, or steam) and what that would typically do to the fluid inside its tubes. • Compare the location of 3 relative to the steam drum: would this location be best suited to create steam, superheat steam, or just raise the temperature of feedwater?

✅ Before You Answer

• Verify whether fluid entering component 3 is liquid water/condensate or steam. • Confirm if the outlet from component 3 goes directly to the steam drum or toward the turbine/superheater. • Make sure the function you choose (from the options) matches a component that is normally placed in that exact position in an exhaust-gas/auxiliary boiler system.