TEXAS HVAC TECHNICIAN CERTIFICATION
PRACTICE EXAM Questions With Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary function of an HVAC system?
A. Generate electricity
B. Control indoor temperature, humidity, and air quality
C. Produce refrigeration chemicals
D. Increase building insulation
Answer: B
Rationale: HVAC systems are designed to regulate heating, ventilation,
and air conditioning for indoor comfort.
2. What refrigerant property allows it to absorb heat?
A. High density
B. Low boiling point
C. High viscosity
D. Electrical conductivity
Answer: B
Rationale: Refrigerants absorb heat by evaporating at low boiling
points.
,3. Which tool is used to measure electrical resistance?
A. Manometer
B. Thermometer
C. Multimeter
D. Tachometer
Answer: C
Rationale: A multimeter measures voltage, current, and resistance.
4. What does SEER rating measure?
A. Heating capacity
B. Cooling efficiency
C. Airflow speed
D. Refrigerant pressure
Answer: B
Rationale: SEER stands for Seasonal Energy Efficiency Ratio.
5. What is the purpose of a thermostat?
A. Measure refrigerant
B. Control system temperature
C. Increase airflow
D. Filter air
Answer: B
Rationale: A thermostat regulates temperature by controlling system
operation.
,6. What component removes moisture from air?
A. Compressor
B. Evaporator coil
C. Condenser
D. Expansion valve
Answer: B
Rationale: The evaporator coil cools air and removes humidity.
7. What gas law relates pressure, volume, and temperature?
A. Ohm’s Law
B. Boyle’s Law
C. Newton’s Law
D. Dalton’s Law
Answer: B
Rationale: Boyle’s Law explains pressure-volume relationships in gases.
8. What does a capacitor do in an HVAC motor?
A. Stores refrigerant
B. Starts or runs motor
C. Filters air
D. Controls humidity
Answer: B
Rationale: Capacitors provide starting torque or running efficiency.
, 9. Which refrigerant phase absorbs heat?
A. Liquid
B. Solid
C. Vaporization
D. Compression
Answer: C
Rationale: Evaporation absorbs heat from indoor air.
10. What is superheat?
A. Liquid below freezing
B. Extra heat added to vapor
C. Air pressure drop
D. Condensation point
Answer: B
Rationale: Superheat ensures refrigerant is fully vaporized.
11. What is subcooling?
A. Cooling vapor below dew point
B. Cooling liquid below condensation point
C. Heating air
D. Compressing gas
Answer: B
Rationale: Subcooling ensures liquid refrigerant is fully condensed.
PRACTICE EXAM Questions With Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary function of an HVAC system?
A. Generate electricity
B. Control indoor temperature, humidity, and air quality
C. Produce refrigeration chemicals
D. Increase building insulation
Answer: B
Rationale: HVAC systems are designed to regulate heating, ventilation,
and air conditioning for indoor comfort.
2. What refrigerant property allows it to absorb heat?
A. High density
B. Low boiling point
C. High viscosity
D. Electrical conductivity
Answer: B
Rationale: Refrigerants absorb heat by evaporating at low boiling
points.
,3. Which tool is used to measure electrical resistance?
A. Manometer
B. Thermometer
C. Multimeter
D. Tachometer
Answer: C
Rationale: A multimeter measures voltage, current, and resistance.
4. What does SEER rating measure?
A. Heating capacity
B. Cooling efficiency
C. Airflow speed
D. Refrigerant pressure
Answer: B
Rationale: SEER stands for Seasonal Energy Efficiency Ratio.
5. What is the purpose of a thermostat?
A. Measure refrigerant
B. Control system temperature
C. Increase airflow
D. Filter air
Answer: B
Rationale: A thermostat regulates temperature by controlling system
operation.
,6. What component removes moisture from air?
A. Compressor
B. Evaporator coil
C. Condenser
D. Expansion valve
Answer: B
Rationale: The evaporator coil cools air and removes humidity.
7. What gas law relates pressure, volume, and temperature?
A. Ohm’s Law
B. Boyle’s Law
C. Newton’s Law
D. Dalton’s Law
Answer: B
Rationale: Boyle’s Law explains pressure-volume relationships in gases.
8. What does a capacitor do in an HVAC motor?
A. Stores refrigerant
B. Starts or runs motor
C. Filters air
D. Controls humidity
Answer: B
Rationale: Capacitors provide starting torque or running efficiency.
, 9. Which refrigerant phase absorbs heat?
A. Liquid
B. Solid
C. Vaporization
D. Compression
Answer: C
Rationale: Evaporation absorbs heat from indoor air.
10. What is superheat?
A. Liquid below freezing
B. Extra heat added to vapor
C. Air pressure drop
D. Condensation point
Answer: B
Rationale: Superheat ensures refrigerant is fully vaporized.
11. What is subcooling?
A. Cooling vapor below dew point
B. Cooling liquid below condensation point
C. Heating air
D. Compressing gas
Answer: B
Rationale: Subcooling ensures liquid refrigerant is fully condensed.
