Machinery Repairman Practice Test

The four areas of operation in the main steam system are generation, expansion, condensation, and what else?

Vent Drain Feed Reheat

Correct Answer:

Feed

Explanation:

The four main operations of the steam cycle form a closed loop: generation (boiler produces steam), expansion (steam does work in the turbine), condensation (steam is turned back into water in the condenser), and feed (feedwater is pumped back into the boiler to restart the cycle). The fourth area is feed because it completes the loop by returning the water to the boiler, maintaining water level and pressure for continuous operation. Vent, drain, and reheat serve important roles in steam systems, but they are not the primary fourth operation in this cycle. Venting lets off excess steam, a drain handles condensate or blowdown, and reheat improves efficiency within the expansion stage rather than forming a separate main cycle area.

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