NATE Core Service Certification Exam
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following best describes the purpose of the NATE
Core exam?
A. Assessing specialized knowledge in gas furnaces
B. Evaluating general HVACR service knowledge and safety
practices
C. Certifying technicians for commercial refrigeration only
D. Testing knowledge of electrical engineering principles
B. Evaluating general HVACR service knowledge and safety practices
The NATE Core exam evaluates foundational knowledge in HVACR
service, safety, and diagnostic skills common across multiple
specialties. It is not specific to one type of equipment.
, 2. Before performing service on an HVAC system, the first step a
technician should take is:
A. Begin disassembly
B. Shut off power and follow lockout/tagout procedures
C. Replace air filters
D. Call the manufacturer
B. Shut off power and follow lockout/tagout procedures
Safety is the top priority. Lockout/tagout ensures that electrical or
mechanical energy sources are isolated before service.
3. Which tool is most appropriate for measuring refrigerant
pressure?
A. Multimeter
B. Manifold gauge set
C. Thermometer
D. Anemometer
B. Manifold gauge set
A manifold gauge set is specifically designed for reading both high-
and low-side refrigerant pressures in HVACR systems.
4. What is the primary purpose of the heat exchanger in a furnace?
A. Distribute airflow
B. Transfer heat from combustion gases to air
, C. Store refrigerant
D. Control fan speed
B. Transfer heat from combustion gases to air
The heat exchanger safely transfers heat from combustion gases to
the air that circulates through ductwork without mixing combustion
products with indoor air.
5. When troubleshooting a split-system air conditioner, the first
component a technician should typically check is:
A. Expansion valve
B. Outdoor condenser unit
C. Electrical disconnect and breakers
D. Evaporator coil
C. Electrical disconnect and breakers
Starting with basic electrical checks ensures power is supplied and
safe before moving to more complex components.
6. A technician notices ice forming on an evaporator coil. Which of
the following is the most likely cause?
A. Low refrigerant charge or poor airflow
B. Overcharged system
C. High ambient temperature
D. Dirty condenser coil only
, A. Low refrigerant charge or poor airflow
Ice forms on the evaporator when refrigerant is insufficient or airflow
is restricted, lowering the coil temperature below freezing.
7. The proper refrigerant recovery procedure requires:
A. Venting the refrigerant into the atmosphere
B. Capturing refrigerant in approved recovery equipment
C. Releasing it into a drain
D. Diluting with water before disposal
B. Capturing refrigerant in approved recovery equipment
EPA regulations require capturing refrigerant to prevent
environmental release.
8. In electrical systems, the term “ohm’s law” describes the
relationship between:
A. Voltage, current, and resistance
B. Power and energy efficiency
C. Capacitance and inductance
D. Hertz and frequency
A. Voltage, current, and resistance
Ohm’s law states that voltage equals current times resistance (V = I ×
R), fundamental in troubleshooting electrical circuits.
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following best describes the purpose of the NATE
Core exam?
A. Assessing specialized knowledge in gas furnaces
B. Evaluating general HVACR service knowledge and safety
practices
C. Certifying technicians for commercial refrigeration only
D. Testing knowledge of electrical engineering principles
B. Evaluating general HVACR service knowledge and safety practices
The NATE Core exam evaluates foundational knowledge in HVACR
service, safety, and diagnostic skills common across multiple
specialties. It is not specific to one type of equipment.
, 2. Before performing service on an HVAC system, the first step a
technician should take is:
A. Begin disassembly
B. Shut off power and follow lockout/tagout procedures
C. Replace air filters
D. Call the manufacturer
B. Shut off power and follow lockout/tagout procedures
Safety is the top priority. Lockout/tagout ensures that electrical or
mechanical energy sources are isolated before service.
3. Which tool is most appropriate for measuring refrigerant
pressure?
A. Multimeter
B. Manifold gauge set
C. Thermometer
D. Anemometer
B. Manifold gauge set
A manifold gauge set is specifically designed for reading both high-
and low-side refrigerant pressures in HVACR systems.
4. What is the primary purpose of the heat exchanger in a furnace?
A. Distribute airflow
B. Transfer heat from combustion gases to air
, C. Store refrigerant
D. Control fan speed
B. Transfer heat from combustion gases to air
The heat exchanger safely transfers heat from combustion gases to
the air that circulates through ductwork without mixing combustion
products with indoor air.
5. When troubleshooting a split-system air conditioner, the first
component a technician should typically check is:
A. Expansion valve
B. Outdoor condenser unit
C. Electrical disconnect and breakers
D. Evaporator coil
C. Electrical disconnect and breakers
Starting with basic electrical checks ensures power is supplied and
safe before moving to more complex components.
6. A technician notices ice forming on an evaporator coil. Which of
the following is the most likely cause?
A. Low refrigerant charge or poor airflow
B. Overcharged system
C. High ambient temperature
D. Dirty condenser coil only
, A. Low refrigerant charge or poor airflow
Ice forms on the evaporator when refrigerant is insufficient or airflow
is restricted, lowering the coil temperature below freezing.
7. The proper refrigerant recovery procedure requires:
A. Venting the refrigerant into the atmosphere
B. Capturing refrigerant in approved recovery equipment
C. Releasing it into a drain
D. Diluting with water before disposal
B. Capturing refrigerant in approved recovery equipment
EPA regulations require capturing refrigerant to prevent
environmental release.
8. In electrical systems, the term “ohm’s law” describes the
relationship between:
A. Voltage, current, and resistance
B. Power and energy efficiency
C. Capacitance and inductance
D. Hertz and frequency
A. Voltage, current, and resistance
Ohm’s law states that voltage equals current times resistance (V = I ×
R), fundamental in troubleshooting electrical circuits.
