FREE North American Technician Excellence Questions and Answers 2026 October
📗 Prepare for the FREE North American Technician certification. Practice questions with answer explanations covering all exam domains.
Sample NATE - North American Technician Excellence Practice Questions
Try these questions from our free NATE - North American Technician Excellence practice tests. The correct answer and an explanation follow each question.
What does a suction line accumulator protect in a refrigeration system?
- A. Liquid line from high pressure
- B. Compressor from liquid refrigerant slugging
- C. Condenser from excess load
- D. Expansion device from debris
Answer: B. Compressor from liquid refrigerant slugging
The accumulator traps liquid refrigerant on the suction line, boiling it off slowly rather than allowing it to enter and damage the compressor.
What is the function of the delayed oil valve (solenoid valve) on some oil burners?
- A. Prevent oil flow during power outages
- B. Stop oil flow immediately on burner shutdown to prevent after-drip and after-fire
- C. Regulate oil pressure during high-fire mode
- D. Allow oil to flow only on a call for heat
Answer: B. Stop oil flow immediately on burner shutdown to prevent after-drip and after-fire
The delayed oil valve closes instantly when the burner shuts off, preventing oil drip into the combustion chamber that could cause after-fire and smoke.
What EPA regulation governs refrigerant handling and requires recovery before service of commercial refrigeration equipment?
- A. EPA Section 404
- B. EPA Section 608
- C. Clean Water Act
- D. OSHA 29 CFR 1910
Answer: B. EPA Section 608
EPA Section 608 prohibits venting refrigerants and requires certified technicians to recover refrigerant before opening any refrigerant circuit.
What annual maintenance item is most critical for oil burner efficiency?
- A. Replacing the transformer
- B. Replacing the nozzle and cleaning the strainer, electrodes, and heat exchanger
- C. Adjusting the thermostat anticipator
- D. Flushing the oil tank
Answer: B. Replacing the nozzle and cleaning the strainer, electrodes, and heat exchanger
An annual tune-up including nozzle replacement and cleaning ensures complete combustion, maximum efficiency, and safe operation.
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About the Author
NATE Certified HVAC Technician & Licensing Exam Trainer
Universal Technical InstituteMike Johnson is a NATE-certified HVAC technician and EPA 608 universal-certified refrigerant handler with a Bachelor of Science in HVAC/R Technology. He has 19 years of commercial and residential HVAC installation and service experience and specializes in preparing technicians for NATE certification, EPA 608, A2L refrigerant safety, and state HVAC contractor licensing examinations.
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