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NATE Core Exam Revision
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Avg score: 84% Most missed: “Doubling of duct diameter will reduce friction loss by a factor of _____ times”
The NATE (North American Technician Excellence) Core Exam is the foundation for all NATE certifications and tests a technician's fundamental knowledge of HVACR systems. It is a 50-question, closed-book exam that covers safety, tools, basic construction, science, and electrical principles.  Here is a breakdown of the NATE Core Revision syllabus based on the Knowledge Areas of Technician Expertise (KATEs): 1. Safety Job Site Safety: OSHA standards, personal protective equipment (PPE), hazard recognition, and mitigation. Safe Procedures: Proper handling of refrigerants, lockout/tagout... Show more
NATE Core Exam Revision
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25 Questions

1. Which of the is used to smooth out the variations in the power source current:

2. Square cut or butt joints are not permitted on corners of ductboard sections:

3. Screw compressors have almost nonlinear capacity control mechanism:

4. Which of the following device has the function to prevent migration of liquid refrigerant and oil:

5. Common indoor levels of nitrogen oxide are _______ or less

6. _______ Heat that can be measured or felt

7. The rate at which the compressor oil absorbing gas ______ as the oil temperature falls:

8. Inductance is the property of the coil that opposes any sudden change in the circuit ______

9. When a _____ is applied to a capacitor, after charging it acts as _____ circuit:

10. ______ are preferred for high volume and low pressure applications:

11. Gas burners operating at high pressure will be typically in the range:

12. As the compression ratio increases, heat rejection factor of the condenser _______ :

13. ______ are designed for allowing the flow of refrigerant in one direction

14. ________ opposes sudden changes in the current variation in the electrical circuit

15. Turning the TXV valve stem in _______ direction increases super heat:

16. The closed type condensers are not internally driven by the motor:

17. The condenser temperature or discharge pressure will not change with the change in the surrounding temperature:

18. One watt = _______ Btu

19. 1 boiler horsepower = _______ Btuh

20. 1 kWh of electric power is equivalent to ______ Btu per hour:

21. If the branch circuit also feeds lighting units or other appliances, the total load of the air conditioner shall not exceed _______ percent of the current rating of the circuit.

22. Black wire in electrical wiring represents:

23. Motor controller is capable of starting and stopping the motor but will not provide overload protection:

24. Dual voltage three phase motor has _____ number of terminals

25. In electronic filter, the electrical field ionizes the dust to a _______ charge: