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NATE Exam: Air Conditioning and Heat Pumps
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The NATE (North American Technician Excellence) Air Conditioning and Heat Pump exams are rigorous, industry-recognized tests certifying expertise in installing, servicing, and repairing HVAC systems. Technicians must pass a 50-question Core exam plus 100-question Specialty exams in AC or Heat Pumps (scoring 70%+). Certification requires renewal every two years.  Key Details of NATE AC & Heat Pump Certification Certification Structure: To become certified, a technician must pass two exams: Core Exam: Covers fundamental knowledge (safety, tools, basic heat transfer, electrical). Specialty... Show more
NATE Exam: Air Conditioning and Heat Pumps
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25 Questions

1. Which of the following factors affects a customer's level of comfort?
2. What effect does raising the pressure in a sealed system have on refrigerant?
3. The maximum temperature at which refrigerant may be stored is ____°F when the container is no more than ____% full of liquid by volume.
4. Voltage supplied to a motor may vary from the rated voltage by ____%.
5. Temperature readings taken on the refrigerant discharge line 6 in. from the compressor must never exceed ____°F.
6. Which of the following statements about the installation of an electric air cleaner (EAC) is true?
7. The evacuation of a refrigerant circuit is considered complete when a vacuum of ____ can be maintained.
8. What is the purpose of a receiver?
9. The NEC approves a ____ dual-element time-delay fuse as overcurrent protection for a 20-A motor?
10. What affect does a low refrigerant charge have on reversing valve operation?
11. Which of the following electrical components is a power-passing device?
12. Which of the following combination of measurements indicates an open heater element?
13. In wiring diagrams, solid heavy lines usually indicate ____.
14. Some electromechanical thermostats must be connected to both sides of the transformer in order to power the ____.
15. Which of the following statements about understanding wiring diagrams is not true?
16. What type of flame is recommended for brazing refrigerant piping?
17. Which of the following functions occur when a heat pump goes into a defrost cycle?
18. As the length of electrical wire increases, its resistance ____ while the temperature is maintained at a constant level.
19. What tool should be used to shorten a capillary tube?
20. Of the motors commonly used in HVACR systems, which type has the lowest starting torque?
21. Use the collected service data below to calculate the air flow volume for a residential electric furnace:
Voltage = 240 V ac
Current draw = 40 A
Entering air temperature = 70°F
Leaving air temperature = 105°F
cfm = (voltage x current x 3.413) / (temperature rise x 1.08)
22. When adding a heat pump to an existing fossil-fuel furnace, an installer must do all of the following except ____.
23. What air volume flow rate of recirculated indoor air equals one ton of cooling load on the evaporator?
24. What is the maximum recommended face velocity for air leaving a supply register?
25. Which component pumps refrigerant through the system and raises the vapor temperature?

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