MACS 609 Certification Practice Exam

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What characteristic does PAG lubricant have regarding moisture?

It repels moisture
It is hygroscopic and absorbs moisture
It evaporates moisture
It neutralizes moisture

The correct answer is: It is hygroscopic and absorbs moisture

PAG (Polyalkylene Glycol) lubricant is known for being hygroscopic, meaning it has the ability to absorb moisture from the surrounding environment. This characteristic is important in applications where the presence of moisture can impact the performance of lubricants. PAG lubricants are often used in refrigeration and air conditioning systems, where moisture can be detrimental to the operation and longevity of the components involved. The hygroscopic nature of PAG lubricants means that they can effectively capture and hold onto water molecules, which can lead to issues like reduced lubricant performance over time or even chemical reactions that may occur as a result of the absorbed moisture. In contexts where PAG lubricants are applied, it is crucial to manage moisture levels to ensure optimal functionality and prevent potential system failures. Other characteristics, such as repelling moisture or evaporating it, do not correctly describe how PAG lubricants interact with water. Instead, recognizing them as hygroscopic emphasizes the importance of proper handling and storage to maintain their intended performance.