NATE Comfort and Airflow Certification
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
Pdf
1. What is the primary purpose of airflow measurement in HVAC systems?
A. Determine refrigerant charge
B. Assess system comfort and efficiency
C. Measure electrical load
D. Calculate compressor speed
Answer: B
Rationale: Airflow measurement ensures proper distribution of
conditioned air, directly affecting comfort and system efficiency.
2. Which instrument is commonly used to measure air velocity?
A. Manometer
B. Thermocouple
C. Anemometer
D. Hygrometer
Answer: C
Rationale: An anemometer measures air velocity, which is essential for
calculating airflow.
,3. Total external static pressure (TESP) is measured across:
A. Compressor
B. Evaporator coil only
C. Entire air handler system
D. Condenser coil
Answer: C
Rationale: TESP includes all external resistances in the air handler system,
including filters and ducts.
4. What unit is used to measure airflow?
A. PSI
B. CFM
C. BTU
D. Volts
Answer: B
Rationale: Cubic feet per minute (CFM) measures airflow volume.
5. High static pressure typically indicates:
A. Oversized ducts
B. Restricted airflow
C. Low refrigerant
D. High humidity
Answer: B
Rationale: Restrictions like dirty filters or undersized ducts increase static
pressure.
6. A dirty air filter will most likely:
A. Increase airflow
B. Decrease airflow
C. Increase voltage
D. Reduce temperature
Answer: B
Rationale: Dirt buildup restricts airflow through the system.
, 7. What is the recommended airflow per ton for most HVAC systems?
A. 200 CFM
B. 300 CFM
C. 400 CFM
D. 600 CFM
Answer: C
Rationale: Standard design airflow is about 400 CFM per ton of cooling.
8. Which component primarily controls airflow in a duct system?
A. Compressor
B. Blower motor
C. Thermostat
D. Expansion valve
Answer: B
Rationale: The blower motor moves air through the duct system.
9. What does low airflow across the evaporator cause?
A. High head pressure
B. Coil freezing
C. Increased airflow
D. Reduced humidity
Answer: B
Rationale: Insufficient airflow can cause the evaporator coil to freeze.
10.Static pressure is measured in:
A. Volts
B. Inches of water column
C. Amps
D. Degrees Fahrenheit
Answer: B
Rationale: Static pressure is commonly measured in inches of water
column (in. w.c.).
11.Which tool measures static pressure?
A. Thermometer
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
1. What is the primary purpose of airflow measurement in HVAC systems?
A. Determine refrigerant charge
B. Assess system comfort and efficiency
C. Measure electrical load
D. Calculate compressor speed
Answer: B
Rationale: Airflow measurement ensures proper distribution of
conditioned air, directly affecting comfort and system efficiency.
2. Which instrument is commonly used to measure air velocity?
A. Manometer
B. Thermocouple
C. Anemometer
D. Hygrometer
Answer: C
Rationale: An anemometer measures air velocity, which is essential for
calculating airflow.
,3. Total external static pressure (TESP) is measured across:
A. Compressor
B. Evaporator coil only
C. Entire air handler system
D. Condenser coil
Answer: C
Rationale: TESP includes all external resistances in the air handler system,
including filters and ducts.
4. What unit is used to measure airflow?
A. PSI
B. CFM
C. BTU
D. Volts
Answer: B
Rationale: Cubic feet per minute (CFM) measures airflow volume.
5. High static pressure typically indicates:
A. Oversized ducts
B. Restricted airflow
C. Low refrigerant
D. High humidity
Answer: B
Rationale: Restrictions like dirty filters or undersized ducts increase static
pressure.
6. A dirty air filter will most likely:
A. Increase airflow
B. Decrease airflow
C. Increase voltage
D. Reduce temperature
Answer: B
Rationale: Dirt buildup restricts airflow through the system.
, 7. What is the recommended airflow per ton for most HVAC systems?
A. 200 CFM
B. 300 CFM
C. 400 CFM
D. 600 CFM
Answer: C
Rationale: Standard design airflow is about 400 CFM per ton of cooling.
8. Which component primarily controls airflow in a duct system?
A. Compressor
B. Blower motor
C. Thermostat
D. Expansion valve
Answer: B
Rationale: The blower motor moves air through the duct system.
9. What does low airflow across the evaporator cause?
A. High head pressure
B. Coil freezing
C. Increased airflow
D. Reduced humidity
Answer: B
Rationale: Insufficient airflow can cause the evaporator coil to freeze.
10.Static pressure is measured in:
A. Volts
B. Inches of water column
C. Amps
D. Degrees Fahrenheit
Answer: B
Rationale: Static pressure is commonly measured in inches of water
column (in. w.c.).
11.Which tool measures static pressure?
A. Thermometer
