HVAC EXCELLENCE PROFESSIONAL TECHNICIAN
EXAM QUESTIONS WITH CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A
|INSTANT DOWNLOAD PDF
1. What is the primary purpose of a compressor in an HVAC
system?
A. To remove moisture from the air
B. To increase refrigerant pressure and temperature
C. To cool the air directly
D. To filter the air
Rationale: The compressor in an HVAC system raises the
pressure and temperature of the refrigerant so it can release
heat in the condenser.
Correct Answer: B
2. Which type of refrigerant is considered ozone-friendly?
A. R-22
B. R-134a
C. R-12
D. R-502
Rationale: R-134a does not contain chlorine and does not
deplete the ozone layer, unlike older refrigerants such as R-22.
,Correct Answer: B
3. What does the SEER rating of an air conditioner indicate?
A. The unit’s cooling capacity
B. The energy efficiency over a typical cooling season
C. The unit’s refrigerant type
D. The airflow rate
Rationale: SEER (Seasonal Energy Efficiency Ratio) measures
how efficiently a system operates over an entire cooling
season.
Correct Answer: B
4. Which tool is used to measure refrigerant pressure in HVAC
systems?
A. Anemometer
B. Manifold gauge set
C. Multimeter
D. Thermocouple
Rationale: A manifold gauge set allows technicians to read both
high and low side pressures in the refrigeration cycle.
Correct Answer: B
5. In a split-system air conditioner, what is the function of the
evaporator coil?
,A. To release heat to the outside air
B. To compress refrigerant
C. To absorb heat from indoor air
D. To circulate refrigerant to the condenser
Rationale: The evaporator coil absorbs heat from indoor air and
allows the refrigerant to evaporate.
Correct Answer: C
6. What is the primary cause of ice formation on an
evaporator coil?
A. Dirty air filter
B. Low refrigerant charge
C. Excessive airflow
D. High ambient temperature
Rationale: Low refrigerant levels reduce pressure and
temperature in the coil, causing moisture to freeze.
Correct Answer: B
7. Which safety device protects a compressor from high
pressure?
A. Low-pressure switch
B. High-pressure switch
C. Thermostat
D. Expansion valve
, Rationale: The high-pressure switch opens to shut down the
system if the refrigerant pressure exceeds safe limits.
Correct Answer: B
8. What type of expansion device is commonly used in
residential air conditioners?
A. Thermostatic expansion valve (TXV)
B. Capillary tube
C. Both A and B
D. Evaporator fan
Rationale: Residential systems often use either a TXV or a
capillary tube to control refrigerant flow.
Correct Answer: C
9. What is the recommended refrigerant handling practice?
A. Venting to the atmosphere
B. Using recovery equipment
C. Mixing with other refrigerants
D. Recharging from an unknown source
Rationale: Refrigerants must be recovered properly to prevent
environmental damage and comply with regulations.
Correct Answer: B
EXAM QUESTIONS WITH CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A
|INSTANT DOWNLOAD PDF
1. What is the primary purpose of a compressor in an HVAC
system?
A. To remove moisture from the air
B. To increase refrigerant pressure and temperature
C. To cool the air directly
D. To filter the air
Rationale: The compressor in an HVAC system raises the
pressure and temperature of the refrigerant so it can release
heat in the condenser.
Correct Answer: B
2. Which type of refrigerant is considered ozone-friendly?
A. R-22
B. R-134a
C. R-12
D. R-502
Rationale: R-134a does not contain chlorine and does not
deplete the ozone layer, unlike older refrigerants such as R-22.
,Correct Answer: B
3. What does the SEER rating of an air conditioner indicate?
A. The unit’s cooling capacity
B. The energy efficiency over a typical cooling season
C. The unit’s refrigerant type
D. The airflow rate
Rationale: SEER (Seasonal Energy Efficiency Ratio) measures
how efficiently a system operates over an entire cooling
season.
Correct Answer: B
4. Which tool is used to measure refrigerant pressure in HVAC
systems?
A. Anemometer
B. Manifold gauge set
C. Multimeter
D. Thermocouple
Rationale: A manifold gauge set allows technicians to read both
high and low side pressures in the refrigeration cycle.
Correct Answer: B
5. In a split-system air conditioner, what is the function of the
evaporator coil?
,A. To release heat to the outside air
B. To compress refrigerant
C. To absorb heat from indoor air
D. To circulate refrigerant to the condenser
Rationale: The evaporator coil absorbs heat from indoor air and
allows the refrigerant to evaporate.
Correct Answer: C
6. What is the primary cause of ice formation on an
evaporator coil?
A. Dirty air filter
B. Low refrigerant charge
C. Excessive airflow
D. High ambient temperature
Rationale: Low refrigerant levels reduce pressure and
temperature in the coil, causing moisture to freeze.
Correct Answer: B
7. Which safety device protects a compressor from high
pressure?
A. Low-pressure switch
B. High-pressure switch
C. Thermostat
D. Expansion valve
, Rationale: The high-pressure switch opens to shut down the
system if the refrigerant pressure exceeds safe limits.
Correct Answer: B
8. What type of expansion device is commonly used in
residential air conditioners?
A. Thermostatic expansion valve (TXV)
B. Capillary tube
C. Both A and B
D. Evaporator fan
Rationale: Residential systems often use either a TXV or a
capillary tube to control refrigerant flow.
Correct Answer: C
9. What is the recommended refrigerant handling practice?
A. Venting to the atmosphere
B. Using recovery equipment
C. Mixing with other refrigerants
D. Recharging from an unknown source
Rationale: Refrigerants must be recovered properly to prevent
environmental damage and comply with regulations.
Correct Answer: B
