Free Practice Questions for NATE Core
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Key Facts: NATE Core Exam
100
Practice Questions
OpenExamPrep
50
Exam Questions
NATE
1.5 hours
Time Limit
NATE
70%
Passing Score (35/50)
NATE
26%
Basic Electricity (largest domain)
NATE
Required
Core for all specialties
NATE
The NATE Core Knowledge Exam from North American Technician Excellence (NATE) is the foundational HVAC/R exam required before most NATE specialty certifications. It is a closed-book, 50-question multiple-choice test with a 1.5-hour (90-minute) time limit, and a passing score of 70% (35 of 50). The Core tests general, construction, and HVAC/R knowledge across seven domains: Safety (18%), Tools (10%), Basic Construction (8%), Using Basic Science (10%), Achieving Desired Conditions (14%), Taking Temperature and Humidity Measurements (14%), and Basic Electricity (26%). Topics span PPE and brazing safety, measuring and tubing tools, electrical fundamentals and Ohm's law, motors and ladder diagrams, heat transfer and BTU, psychrometrics, and proper airflow. This free prep includes 100 research-based practice questions with explanations and an AI tutor.
Sample NATE Core Practice Questions
Try these sample questions to review concepts for the NATE Core exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Before servicing HVAC equipment that may be energized, what is the most important first step?
2Which document must be readily accessible to workers and lists a hazardous chemical's handling and first-aid information?
3What gas is commonly used to purge tubing of oxygen during brazing to prevent internal oxidation (scale)?
4When refrigerant is released into a confined space, what is the primary exposure danger?
5Which type of fire extinguisher is rated for use on energized electrical equipment fires?
6What does a GFCI (ground-fault circuit interrupter) on an outdoor extension cord protect against?
7After a noise assessment determines hearing protection is required, which PPE protects hearing?
8When using a ladder, what is the recommended angle ratio for safe placement of an extension ladder?
9Compressed gas cylinders such as nitrogen or acetylene should be stored and transported in what position with what feature in place?
10What is the main purpose of wearing a respirator when handling fibrous duct insulation or working in dusty attics?
About the NATE Core Exam
The NATE Core Knowledge Exam is the foundational test every HVAC/R technician must pass to earn most NATE installation or service specialty certifications. It contains 50 multiple-choice questions delivered closed-book over 1.5 hours, and requires 70% (35 of 50) to pass.
Exam sponsor: North American Technician Excellence (NATE). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Assessment
50 multiple-choice questions over a 1.5-hour (90-minute) closed-book exam, 70% to pass (35 of 50); this practice bank is 100 selected-response items
Time Limit
1.5 hours (90 minutes)
Passing Score
70% (35 of 50)
Exam / Certification Fees
About $75 in-person; up to ~$150 for live online proctoring (varies by testing organization)
Exam sponsor websiteFees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Our practice resources: topics covered
We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.
Basic Electricity
Electrical symbols, schematic (ladder) and pictorial diagrams, single/three-phase and ECM/actuator motors, contactors and relays, and using digital meters for voltage, resistance, and amperage
Safety
Regulations, SDS/HazCom, confined spaces, ladders, electrical safety and GFCI, PPE, fire extinguishers, brazing/purging, and safe handling of hazardous materials and cylinders
Achieving Desired Conditions
Temperature and humidity comfort, ventilation and air quality, air cleaning and odor control, sound, dehumidification, and proper airflow
Taking Temperature & Humidity Measurements
Sensible and latent heat, BTU, heat transfer, thermometers, sling psychrometer, wet/dry-bulb, delta T, calibration, psychrometric charts, and enthalpy
Tools
Measuring tools and basic math measurement, fabrication tools, tubing tools (cutting, reaming, flaring, swaging, bending), and tool maintenance
Using Basic Science
Matter and combustion, Ohm's law, AC/DC and series/parallel circuits, power and loads, gas laws, pressure, mechanics, and HVAC math/geometry
Basic Construction
Plans and specifications, blueprint reading, construction materials and framing, fenestration, clear span, piping layouts, and chimneys
Preparing for the NATE Core Exam
What You Need to Know
- Passing score: 70% (35 of 50)
- Assessment: 50 multiple-choice questions over a 1.5-hour (90-minute) closed-book exam, 70% to pass (35 of 50); this practice bank is 100 selected-response items
- Time limit: 1.5 hours (90 minutes)
- Exam / certification fees: About $75 in-person; up to ~$150 for live online proctoring (varies by testing organization) Official sources
Using Our Practice Resources
- Work through all 100 available questions
- Review every answer and explanation
- Track weak areas and revisit them
- Use our AI tutor for tough concepts
NATE Core: Suggested Study Strategy
Frequently Asked Questions
How many questions are on the NATE Core exam and how long is it?
The NATE Core Knowledge Exam has 50 multiple-choice questions and a 1.5-hour (90-minute) time limit. It is a closed-book exam, and you need 70% (35 of 50 correct) to pass.
What score do I need to pass the NATE Core exam?
You need 70% to pass, which is 35 of the 50 questions. Because Basic Electricity is the largest domain at 26% and Safety is 18%, balanced study weighted toward those areas is the most efficient path to passing.
Is the NATE Core exam required for NATE certification?
Yes. The Core is the foundational exam required before most NATE installation or service specialty certifications. You pass the Core once, then add specialty exams such as Air Conditioning, Heat Pump, or Gas Furnace to earn full certification.
What topics does the NATE Core exam cover?
It covers seven domains: Safety, Tools, Basic Construction, Using Basic Science, Achieving Desired Conditions, Taking Temperature and Humidity Measurements, and Basic Electricity, the largest section at 26%.
How much does the NATE Core exam cost?
Cost varies by testing organization and delivery. In-person testing typically starts around $75, while live online proctoring can run up to roughly $150. Check with your NATE-approved testing organization for exact fees.
Is this free NATE Core practice as good as paid prep?
Our 100 practice questions are mapped to the official NATE Core domains and weightings, with a teaching explanation for every answer plus free daily AI tutor interactions. All content is free forever and updated for 2026.