Air Conditioning Certification Exam
(Exam Code A-02) Refrigeration Exam
Study Guide 2026
❄️ Complete Questions with Correct Detailed Answers |
Latest Version | High Pass Success
Get fully prepared for your Refrigeration Certification Exam with this comprehensive and
easy-to-follow study guide designed to help you understand key concepts and pass with
confidence.
This resource features complete exam questions with correct detailed answers, covering
essential refrigeration principles, system components, and troubleshooting techniques. Each
answer includes clear explanations to help you build real understanding—not just memorize
content.
🔥 Key Highlights
✔ Complete exam questions covering core refrigeration topics
✔ Correct answers with detailed, easy-to-understand explanations
✔ Covers system operation, maintenance, and safety procedures
✔ Real exam-style questions for effective practice
✔ Latest updated version (2026) for accurate preparation
🧊 Topics Covered
• Refrigeration cycles and principles
• Compressors, condensers, evaporators
• Refrigerants and environmental considerations
• System installation and maintenance
• Troubleshooting and fault diagnosis
• Safety standards and best practices
,🚀 Why This Guide Works
This study guide helps you simplify complex technical concepts, identify common exam
questions, and improve your problem-solving skills. It’s perfect for both beginners and
experienced technicians preparing for certification.
🎯 Ideal For
• Refrigeration certification exam candidates
• HVAC and refrigeration students
• Technicians seeking license or certification
• Exam revision and practice
• Improving technical knowledge and confidence
📚 A practical and reliable study resource designed to help you master refrigeration
concepts and pass your exam with confidence.
Heat which causes a change in temperature of a substance is called; -
ANSWER✅✅✅sensible heat.
Heat which causes a change in state of a material without a change in temperature is
called; -ANSWER✅✅✅latent heat.
Heat which is added to a vapor after the change of state occurs is called; -
ANSWER✅✅✅superheat.
Heat can travel by; -ANSWER✅✅✅conduction, convection, radiation.
The movement of heat by way of fluid (or air) is called; -ANSWER✅✅✅convection .
The movement of heat by direct contact is called; -ANSWER✅✅✅conduction .
The standard unit for measuring the quantity of heat in a substance is; -
ANSWER✅✅✅the British Thermal Unit (Btu).
A refrigerat gives up heat when; -ANSWER✅✅✅it condenses.
, It is desirable for refrigerant in the suction line to be slightly superheated in order to; -
ANSWER✅✅✅insure liquid refrigerant does not enter the compressor.
The state of refrigerant in the suction line should be; -ANSWER✅✅✅low pressure/ low
temperature.
The state of the refrigerant entering the condenser is; -ANSWER✅✅✅high pressure/
highly superheated liquid.
The evaporator; -ANSWER✅✅✅Transfers heat from the refrigerant to the ambient air.
Which of the following is NOT a thermodynamic property of refrigerants?
a) Critical point.
b) Saturation point.
c) Enthalpy.
d) Flammability. -ANSWER✅✅✅d) Flammability.
The sequential order of steps in the vapor - compression process are; -
ANSWER✅✅✅compression, condensation, expansion, vaporization.
If a 30 pound cylinder of reclaimed R-12 refrigerant has been stored over night at 70°F,
the pressure in the cylinder should be approximately; -ANSWER✅✅✅70.2 Psig.
Pressures lower than atmospheric are measured in;
a) inches of mercury
b) microns
c) Psig
d) either "A" or "B". -ANSWER✅✅✅d) either "A" or "B".
Zero psia (pounds per square inch absolute) is; -ANSWER✅✅✅a pressure which
cannot be further reduced.
Zero psig (pounds per square inch guage) is; -ANSWER✅✅✅the same as
atmospheric pressure.
The temperature at which moisture will start to condense from the air is called; -
ANSWER✅✅✅dew point temperature.
A compound pressure guage measures; -ANSWER✅✅✅pressure and vacuum.
A mechanical shaft seal is necessary on a; -ANSWER✅✅✅open drive compressor.
(Exam Code A-02) Refrigeration Exam
Study Guide 2026
❄️ Complete Questions with Correct Detailed Answers |
Latest Version | High Pass Success
Get fully prepared for your Refrigeration Certification Exam with this comprehensive and
easy-to-follow study guide designed to help you understand key concepts and pass with
confidence.
This resource features complete exam questions with correct detailed answers, covering
essential refrigeration principles, system components, and troubleshooting techniques. Each
answer includes clear explanations to help you build real understanding—not just memorize
content.
🔥 Key Highlights
✔ Complete exam questions covering core refrigeration topics
✔ Correct answers with detailed, easy-to-understand explanations
✔ Covers system operation, maintenance, and safety procedures
✔ Real exam-style questions for effective practice
✔ Latest updated version (2026) for accurate preparation
🧊 Topics Covered
• Refrigeration cycles and principles
• Compressors, condensers, evaporators
• Refrigerants and environmental considerations
• System installation and maintenance
• Troubleshooting and fault diagnosis
• Safety standards and best practices
,🚀 Why This Guide Works
This study guide helps you simplify complex technical concepts, identify common exam
questions, and improve your problem-solving skills. It’s perfect for both beginners and
experienced technicians preparing for certification.
🎯 Ideal For
• Refrigeration certification exam candidates
• HVAC and refrigeration students
• Technicians seeking license or certification
• Exam revision and practice
• Improving technical knowledge and confidence
📚 A practical and reliable study resource designed to help you master refrigeration
concepts and pass your exam with confidence.
Heat which causes a change in temperature of a substance is called; -
ANSWER✅✅✅sensible heat.
Heat which causes a change in state of a material without a change in temperature is
called; -ANSWER✅✅✅latent heat.
Heat which is added to a vapor after the change of state occurs is called; -
ANSWER✅✅✅superheat.
Heat can travel by; -ANSWER✅✅✅conduction, convection, radiation.
The movement of heat by way of fluid (or air) is called; -ANSWER✅✅✅convection .
The movement of heat by direct contact is called; -ANSWER✅✅✅conduction .
The standard unit for measuring the quantity of heat in a substance is; -
ANSWER✅✅✅the British Thermal Unit (Btu).
A refrigerat gives up heat when; -ANSWER✅✅✅it condenses.
, It is desirable for refrigerant in the suction line to be slightly superheated in order to; -
ANSWER✅✅✅insure liquid refrigerant does not enter the compressor.
The state of refrigerant in the suction line should be; -ANSWER✅✅✅low pressure/ low
temperature.
The state of the refrigerant entering the condenser is; -ANSWER✅✅✅high pressure/
highly superheated liquid.
The evaporator; -ANSWER✅✅✅Transfers heat from the refrigerant to the ambient air.
Which of the following is NOT a thermodynamic property of refrigerants?
a) Critical point.
b) Saturation point.
c) Enthalpy.
d) Flammability. -ANSWER✅✅✅d) Flammability.
The sequential order of steps in the vapor - compression process are; -
ANSWER✅✅✅compression, condensation, expansion, vaporization.
If a 30 pound cylinder of reclaimed R-12 refrigerant has been stored over night at 70°F,
the pressure in the cylinder should be approximately; -ANSWER✅✅✅70.2 Psig.
Pressures lower than atmospheric are measured in;
a) inches of mercury
b) microns
c) Psig
d) either "A" or "B". -ANSWER✅✅✅d) either "A" or "B".
Zero psia (pounds per square inch absolute) is; -ANSWER✅✅✅a pressure which
cannot be further reduced.
Zero psig (pounds per square inch guage) is; -ANSWER✅✅✅the same as
atmospheric pressure.
The temperature at which moisture will start to condense from the air is called; -
ANSWER✅✅✅dew point temperature.
A compound pressure guage measures; -ANSWER✅✅✅pressure and vacuum.
A mechanical shaft seal is necessary on a; -ANSWER✅✅✅open drive compressor.
