Exhaust steam in a steam system originates from which component?

• A. Turbine
• B. Boiler
• C. Condenser
• D. Economizer

Answer: (A)

Exhaust steam comes from the turbine. In a steam power cycle, high‑pressure steam from the boiler expands through the turbine, transferring energy to the turbine blades and doing work. After expansion, the steam exits the turbine at a lower pressure and temperature as exhaust steam. This exhaust then usually goes to the condenser to be condensed back into condensate for reuse. The boiler generates the steam, the condenser handles the exhaust, and the economizer heats feedwater—none of these produce exhaust steam. So the origin is the turbine.