- Study guides, Class notes & Summaries

HVAC Certification Practice Tests Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What does a contactor do in an HVAC system? Controls power to major components. What is the purpose of a filter drier? Remove moisture and contaminants from refrigerant. What happens if an air filter is clogged? Reduced airflow and system efficiency. What is latent heat? Heat involved in a phase change without temperature change. What type of compressor is commonly used ...

HVAC Certification Practice Test Questions and Answers

HVAC Certification Practice Tests Questions and Answers (Latest Update 2024)

Propane and Butane are _______ than air: Heavier What will be the resistance in the circuit if the supply voltage is 30V and current flowing through the circuit is 5A 6 ohms Temperature at which oil starts to produce a waxy substance that may interfere with the refrigeration system Floc point What manifold gauge set is used to charge, evacuate, add oil and recover refrigerant from a refrigeration and air conditioning system? Yellow hose Where is the oil separator ...