Refrigeration & Air Conditioning USCG Question #627 (Set 12)

A "hygroscopic" lubricant used in refrigeration compressors would have what characteristic?

Official USCG Answer & Rule Citation

Correct Answer: Option B — having a high affinity for moisture which requires it to be kept in a sealed container

Synthetic POE and PAG lubricants utilized in modern marine refrigeration are highly hygroscopic, possessing a strong chemical affinity for atmospheric moisture, necessitating strict hermetic sealing during storage and handling.

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