Residential HVAC Installation Practice Exam 2025 – The All-in-One Resource to Master Your Certification!

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What does the hiss indicate when removing rubber plugs from a line set during HVAC work?

The tubing is leaking

The tubing is expanding

The tubing is contracting

The tubing is not leaking

When removing rubber plugs from a line set during HVAC work, the hiss sound typically indicates that the tubing is not leaking. This is because the hissing sound is a sign of pressure being equalized, meaning that the tubing is maintaining the same pressure without losing any air or refrigerant. The other options are incorrect because if the tubing was leaking, there would be a different sound, such as a whoosh or a hiss that quickly disappears. The tubing expanding or contracting would also not produce a hissing sound.

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