NV C-1A Boilers Practice Questions - Nevada C-1A Boilers Contractor Examination Exam

Compared with a one-pipe hydronic loop, a two-pipe direct-return system does which of the following?

Uses a single pipe that is both supply and return for every radiator. Eliminates the circulator because steam carries the heat. Provides a separate supply main and return main so each emitter has its own supply takeoff and return drop. Requires the expansion tank to be open to atmosphere at every radiator.

Correct Answer:

Provides a separate supply main and return main so each emitter has its own supply takeoff and return drop.

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