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NATE A/C exam questions focus on residential split systems, testing knowledge of refrigeration cycles, electrical troubleshooting, airflow, and installation, comprising a 50-question Core and 100-question Specialty exam. Key topics include diagnosing refrigerant pressures, superheat/subcooling, heat transfer, and electrical component testing (capacitors/relays).
Sample NATE A/C & Core Exam Questions Refrigeration Cycle: Which component is used to flood the condenser with liquid refrigerant under low outside ambient temperature? Answer: A head pressure control valve. Troubleshooting: A system shows high low-side superheat and low condenser subcooling. What is the most likely issue? Answer: Refrigerant undercharge. Airflow: What instrument is used to measure air velocity in ductwork? Answer: Anemometer. Electrical: What is the acceptable capacitance reading for a run capacitor? Answer: Plus or minus 10% of the rating on the capacitor. Concepts: What type of heat is removed in the condenser? Answer: Sensible and latent heat. Components: A grille equipped with a damper control is called a: Answer: Register. Safety: Which safety device prevents a furnace or air handler from overheating? Answer: Limit switch.
Key Exam Preparation Areas Refrigerant Types: Understanding the use of R-410A in modern residential systems. Electrical Theory: Applying Ohm's Law to electrical troubleshooting. System Operation: Identifying 4 different pressure levels in a mechanical refrigeration system. Tool Usage: Measuring voltage and resistance using a multimeter.
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