Air Conditioning and Refrigeration Contractor Class B –
Practice Licensing Examination Newest 2025 – 2026 Questions
From Actual Exams Complete Questions And Correct Detailed
Answers (Verified Answers) |Already Graded A+||Brand
New!!
Content Covered (Most Tested Areas on the Official Exam)
• Refrigeration cycle fundamentals
• Refrigerants and environmental regulations
• Electrical systems and controls
• Compressors and system components
• Piping, evacuation, and charging procedures
• Heat transfer and thermodynamics
• Safety practices and tools
• Load calculations and system sizing
• Troubleshooting and diagnostics
• Codes, permits, and contractor responsibilities
1. What component in a refrigeration system removes heat from the
conditioned space?
A. Condenser
B. Compressor
C. Evaporator
D. Receiver
Answer: Evaporator
Explanation: The evaporator absorbs heat from the indoor air or refrigerated
space, allowing the refrigerant to evaporate and remove heat from the
environment.
, 2. Which refrigerant classification indicates a refrigerant with low toxicity and
no flame propagation?
A. B2
B. A3
C. A1
D. B1
Answer: A1
Explanation: A1 refrigerants have low toxicity (A) and no flame propagation (1),
making them among the safest refrigerant classifications.
3. The primary function of a condenser in a refrigeration system is to:
A. Absorb heat
B. Reject heat
C. Compress vapor
D. Store refrigerant
Answer: Reject heat
Explanation: The condenser releases heat absorbed by the refrigerant in the
evaporator to the outside environment.
4. Superheat refers to:
A. Liquid refrigerant temperature above saturation
B. Vapor refrigerant temperature above saturation
C. Pressure below atmospheric pressure
D. Refrigerant temperature equal to saturation
Answer: Vapor refrigerant temperature above saturation
Explanation: Superheat occurs when refrigerant vapor is heated above its
saturation temperature at a given pressure.
5. A technician is evacuating a system. The purpose is to remove:
, A. Oil and refrigerant
B. Refrigerant only
C. Air and moisture
D. Liquid refrigerant
Answer: Air and moisture
Explanation: Evacuation removes non-condensable gases and moisture that can
damage the system and reduce efficiency.
6. Which device meters refrigerant into the evaporator based on temperature
and pressure?
A. Capillary tube
B. Thermostatic expansion valve
C. Receiver
D. Oil separator
Answer: Thermostatic expansion valve
Explanation: A TXV adjusts refrigerant flow based on evaporator superheat
conditions.
7. The compression process in a vapor-compression system increases
refrigerant:
A. Volume and pressure
B. Pressure and temperature
C. Pressure only
D. Volume only
Answer: Pressure and temperature
Explanation: Compressing refrigerant vapor increases both pressure and
temperature before it enters the condenser.
8. What instrument measures refrigerant system pressure?
A. Clamp meter
B. Thermometer
Practice Licensing Examination Newest 2025 – 2026 Questions
From Actual Exams Complete Questions And Correct Detailed
Answers (Verified Answers) |Already Graded A+||Brand
New!!
Content Covered (Most Tested Areas on the Official Exam)
• Refrigeration cycle fundamentals
• Refrigerants and environmental regulations
• Electrical systems and controls
• Compressors and system components
• Piping, evacuation, and charging procedures
• Heat transfer and thermodynamics
• Safety practices and tools
• Load calculations and system sizing
• Troubleshooting and diagnostics
• Codes, permits, and contractor responsibilities
1. What component in a refrigeration system removes heat from the
conditioned space?
A. Condenser
B. Compressor
C. Evaporator
D. Receiver
Answer: Evaporator
Explanation: The evaporator absorbs heat from the indoor air or refrigerated
space, allowing the refrigerant to evaporate and remove heat from the
environment.
, 2. Which refrigerant classification indicates a refrigerant with low toxicity and
no flame propagation?
A. B2
B. A3
C. A1
D. B1
Answer: A1
Explanation: A1 refrigerants have low toxicity (A) and no flame propagation (1),
making them among the safest refrigerant classifications.
3. The primary function of a condenser in a refrigeration system is to:
A. Absorb heat
B. Reject heat
C. Compress vapor
D. Store refrigerant
Answer: Reject heat
Explanation: The condenser releases heat absorbed by the refrigerant in the
evaporator to the outside environment.
4. Superheat refers to:
A. Liquid refrigerant temperature above saturation
B. Vapor refrigerant temperature above saturation
C. Pressure below atmospheric pressure
D. Refrigerant temperature equal to saturation
Answer: Vapor refrigerant temperature above saturation
Explanation: Superheat occurs when refrigerant vapor is heated above its
saturation temperature at a given pressure.
5. A technician is evacuating a system. The purpose is to remove:
, A. Oil and refrigerant
B. Refrigerant only
C. Air and moisture
D. Liquid refrigerant
Answer: Air and moisture
Explanation: Evacuation removes non-condensable gases and moisture that can
damage the system and reduce efficiency.
6. Which device meters refrigerant into the evaporator based on temperature
and pressure?
A. Capillary tube
B. Thermostatic expansion valve
C. Receiver
D. Oil separator
Answer: Thermostatic expansion valve
Explanation: A TXV adjusts refrigerant flow based on evaporator superheat
conditions.
7. The compression process in a vapor-compression system increases
refrigerant:
A. Volume and pressure
B. Pressure and temperature
C. Pressure only
D. Volume only
Answer: Pressure and temperature
Explanation: Compressing refrigerant vapor increases both pressure and
temperature before it enters the condenser.
8. What instrument measures refrigerant system pressure?
A. Clamp meter
B. Thermometer
