Residential HVAC Installation Practice Exam

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Prepare for the Residential HVAC Installation Exam with this comprehensive quiz. Test your knowledge with multiple-choice questions and get ready to excel in your HVAC installation career.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Sludge is produced when moisture, acid, and _ are present in the system.

Water
Refrigerant
Oil
Dirt

The correct answer is: Oil

Sludge is produced in an HVAC system when moisture, acid, and oil are present. Oil plays a crucial role in the formation of sludge because it can break down under certain conditions and create a thick, gummy substance that can clog components and reduce system efficiency. While water and dirt can also be harmful to the system, it is the presence of oil that specifically contributes to the formation of sludge in this scenario.