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NATE A/C Exam Questions
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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... Show more
NATE A/C Exam Questions
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25 Questions

1. A service technician measures a return air temperature of 80 degrees and a supply air temperature of 55 degrees. What, if anything, may be wrong with this air residential split system air conditioning unit?
2. What does an anemometer measure?
3. All else being normal, if a system shows a low lowside superheat with high condenser subcooling, what is most likely the problem?
4. The number 25,400 relates to
5. Which type of copper tubing has the thickest wall?
6. A hot wood stove gives up heat to the room by
7. The purpose of the external equalizer on a thermostatic expansion valve is
8. The normal compression ratio for a typical comfort air conditioning application should be in the range of
9. A pressure relief valve is
10. Which of the following applications is not a mechanical cooling system?
11. A hot liquid line with a low to normal high side pressure is an indication of
12. A lockout relay can be reset by
13. Low airflow over a residential split system air conditioning evaporator can cause
14. A compressor is short cycling. Which of the following would not be the cause?
15. In a direct expansion chiller used on air conditioning applications, the refrigerant is on what side of the tubes?
16. A grille equipped with a damper control is called
17. Abnormally low suction pressure can be caused by which of the following?
18. A voltage measured across a switch means
19. All else being normal, if a system shows a high lowside superheat with low condenser subcooling, what is most likely the problem?
20. A double suction riser is used to
21. Air and water are directed counterflow so as to
22. All else being normal, if a system shows a high lowside superheat with high condenser subcooling, what is most likely the problem?
23. A fully hermetic compressor on a 3 ton residential split system has three electrical terminals on the side of the compressor. An ohmmeter reads the following: terminal A to B = 20 ohms, A to C = 15 ohms and B to C = 5 ohms. There was a reading of infinity between all three terminals to ground. Which terminal is the common terminal?
24. A lockout relay is also called
25. A parallel compressor system in which both the crankcase oil level and the refrigerant gas pressure are equalized is a

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