Engine Refrigeration (Supplementary) USCG Question #214 (Set 4)

In addition to the indicated gauge pressure, what other information is presented on the compound gauge for the hypothetical refrigerant illustrated? GS-RA-16

USCG Exam Illustration GS-RA-16
USCG Examination Diagram: Illustration GS-RA-16
Official USCG Answer & Rule Citation

Correct Answer: Option B — the saturation temperature of the refrigerant that corresponds to the gauge pressure at the point of measurement

Compound refrigeration gauges display both positive pressure and vacuum alongside corresponding refrigerant saturation temperature scales. This dual graduation allows technicians to immediately correlate measured operating pressures with exact boiling or condensing temperatures for the specific refrigerant.

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