MACS 609 Certification Practice Exam

Disable ads (and more) with a membership for a one time $4.99 payment

Prepare for the MACS 609 Certification Test with comprehensive study materials and interactive quizzes. Explore multiple choice questions with detailed explanations to excel in your exam!

Practice this question and more.

Mineral-based lubricants are used in which type of mobile A/C system?

CFC-12
HFC-134a
HFO-1234yf
CFC-22

The correct answer is: CFC-12

Mineral-based lubricants are specifically designed to work with systems that utilize CFC-12 (also known as R-12) as a refrigerant. CFC-12 is a chlorofluorocarbon refrigerant that was commonly used in automotive air conditioning systems before being phased out due to environmental regulations. The mineral oil used in these systems is compatible with the chemical properties of CFC-12, ensuring optimal performance and lubrication. In contrast, HFC-134a (R-134a) and HFO-1234yf require synthetic oils with specific additives to ensure proper lubrication within the A/C systems. CFC-22 (R-22) is used primarily in stationary applications rather than mobile systems and also relies on its own specialized lubricants. Therefore, the association of mineral-based lubricants is unique to CFC-12 systems, making it the appropriate choice in this context.