Arizona York HVAC Systems Technician
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
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1. What is the primary function of an HVAC system?
A. To provide electrical power
B. To control indoor temperature, humidity, and air quality
C. To filter drinking water
D. To insulate building walls
The primary purpose of an HVAC system is to regulate the indoor
environment by controlling temperature, humidity, and air quality.
2. In refrigerant systems, what does the term “superheat” refer to?
A. Refrigerant below boiling point
B. Liquid refrigerant temperature
C. Temperature above refrigerant’s boiling point at a given pressure
D. Compressor discharge pressure
Superheat describes the additional heat added to refrigerant vapor
after it has completely boiled, indicating vapor is above its saturation
temperature.
,3. Which component in an HVAC system removes heat from indoor air?
A. Expansion valve
B. Condenser coil
C. Evaporator coil
D. Compressor
The evaporator coil absorbs heat from indoor air, causing refrigerant
to evaporate and cool the air.
4. What is the main purpose of a compressor in a refrigeration cycle?
A. To filter air
B. To increase refrigerant pressure and temperature
C. To decrease refrigerant pressure
D. To absorb heat
Compressors raise the pressure and temperature of refrigerant vapor
to allow heat rejection at the condenser.
5. Which refrigerant is most commonly used in modern residential HVAC
systems due to lower environmental impact?
A. R-22
B. R-410A
C. R-12
D. Ammonia
R-410A replaced older refrigerants like R-22 due to its lower ozone
depletion potential and better efficiency.
6. What device is used to regulate the flow of refrigerant into the
evaporator?
A. Expansion valve
B. Compressor
C. Condenser fan
D. Filter drier
, The expansion valve controls refrigerant flow entering the
evaporator, affecting pressure and cooling.
7. Latent heat in HVAC refers to the heat involved with:
A. Sensible temperature change
B. Phase change without temperature change
C. Electrical energy conversion
D. Heat lost to the environment
Latent heat is the energy absorbed or released during a phase
change, like evaporation or condensation.
8. The SEER rating of an air conditioner indicates:
A. Structural energy efficiency
B. System electrical reliability
C. Seasonal energy efficiency ratio
D. Sound emission efficiency
SEER measures efficiency by comparing cooling output over a season
to energy consumed.
9. What is the purpose of the condenser in an HVAC system?
A. To evaporate refrigerant
B. To filter air
C. To reject heat to the outdoors
D. To circulate water
The condenser releases the heat absorbed inside to the outdoors,
allowing refrigerant to cool and condense.
10. Which safety device prevents excessively high pressure in a
refrigeration system?
A. Thermostat
B. High-pressure switch
C. Expansion valve
D. Blower motor
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. What is the primary function of an HVAC system?
A. To provide electrical power
B. To control indoor temperature, humidity, and air quality
C. To filter drinking water
D. To insulate building walls
The primary purpose of an HVAC system is to regulate the indoor
environment by controlling temperature, humidity, and air quality.
2. In refrigerant systems, what does the term “superheat” refer to?
A. Refrigerant below boiling point
B. Liquid refrigerant temperature
C. Temperature above refrigerant’s boiling point at a given pressure
D. Compressor discharge pressure
Superheat describes the additional heat added to refrigerant vapor
after it has completely boiled, indicating vapor is above its saturation
temperature.
,3. Which component in an HVAC system removes heat from indoor air?
A. Expansion valve
B. Condenser coil
C. Evaporator coil
D. Compressor
The evaporator coil absorbs heat from indoor air, causing refrigerant
to evaporate and cool the air.
4. What is the main purpose of a compressor in a refrigeration cycle?
A. To filter air
B. To increase refrigerant pressure and temperature
C. To decrease refrigerant pressure
D. To absorb heat
Compressors raise the pressure and temperature of refrigerant vapor
to allow heat rejection at the condenser.
5. Which refrigerant is most commonly used in modern residential HVAC
systems due to lower environmental impact?
A. R-22
B. R-410A
C. R-12
D. Ammonia
R-410A replaced older refrigerants like R-22 due to its lower ozone
depletion potential and better efficiency.
6. What device is used to regulate the flow of refrigerant into the
evaporator?
A. Expansion valve
B. Compressor
C. Condenser fan
D. Filter drier
, The expansion valve controls refrigerant flow entering the
evaporator, affecting pressure and cooling.
7. Latent heat in HVAC refers to the heat involved with:
A. Sensible temperature change
B. Phase change without temperature change
C. Electrical energy conversion
D. Heat lost to the environment
Latent heat is the energy absorbed or released during a phase
change, like evaporation or condensation.
8. The SEER rating of an air conditioner indicates:
A. Structural energy efficiency
B. System electrical reliability
C. Seasonal energy efficiency ratio
D. Sound emission efficiency
SEER measures efficiency by comparing cooling output over a season
to energy consumed.
9. What is the purpose of the condenser in an HVAC system?
A. To evaporate refrigerant
B. To filter air
C. To reject heat to the outdoors
D. To circulate water
The condenser releases the heat absorbed inside to the outdoors,
allowing refrigerant to cool and condense.
10. Which safety device prevents excessively high pressure in a
refrigeration system?
A. Thermostat
B. High-pressure switch
C. Expansion valve
D. Blower motor
