Residential HVAC Installation Practice Exam

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What must moisture in a liquid state be before it can be removed with a vacuum pump?

Filtered
Boiled
Evaporated
Crystallized

The correct answer is: Evaporated

Moisture in a liquid state must be evaporated before it can be removed with a vacuum pump. This process occurs when a liquid changes to a gas or vapor state, typically due to an increase in temperature. Filtering, boiling, and crystallizing are all different forms of separation or purification that would not result in the complete change of liquid to gas needed for removal with a vacuum pump. Therefore, these options are incorrect.