Residential HVAC Installation Practice Exam

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Prepare for your Residential HVAC Installation test with our engaging quizzes and in-depth multiple-choice questions. Each question comes with hints and detailed explanations to ensure mastery of the subject matter. Get ready for your exam and boost your confidence!

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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.