In the illustrated refrigeration system, what is the proper name for the component labeled "A"? GS-RA-12 Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option A — compressor

Component "A" in marine refrigeration schematics represents the compressor, which raises the pressure and temperature of the low-pressure refrigerant vapor drawn from the evaporator, discharging high-pressure superheated vapor to the condenser to facilitate heat rejection.