CFESA REFRIGERATION EXAM QUESTIONS AND
100% VERIFIED ANSWERS LATEST UPDATED
150 QUESTIONS AND ANSWERS
1. What is the primary function of a refrigeration system?
o Answer: To cool a space by removing heat from it and transferring
it elsewhere.
2. Which component in a refrigeration system compresses the
refrigerant?
o Answer: The compressor increases the pressure and temperature of
the refrigerant before it enters the condenser.
3. What is the purpose of the evaporator in a refrigeration system?
o Answer: To absorb heat from the space being cooled, causing the
refrigerant to evaporate and carry heat away.
4. Which type of refrigerant is commonly used in modern refrigeration
systems?
o Answer: R-134a, due to its efficiency and lower environmental
impact.
5. What is the role of the condenser in a refrigeration system?
o Answer: To release heat to the surroundings, cooling the
refrigerant and converting it from gas to liquid.
6. What is superheat in a refrigeration system?
o Answer: The heat added to the refrigerant after it evaporates,
ensuring full vaporization before entering the compressor.
7. What is the function of the expansion valve in a refrigeration system?
, o Answer: To regulate the flow of refrigerant into the evaporator,
reducing its pressure and temperature.
8. Which law of thermodynamics is primarily applied in refrigeration
systems?
o Answer: The second law, governing the transfer of heat from a
cooler space to a warmer space using work.
9. What is the typical unit used to measure refrigeration capacity?
o Answer: BTU/hr (British Thermal Units per hour).
10.What is the purpose of refrigerant oil in a refrigeration system?
o Answer: To lubricate the compressor, reducing wear and ensuring
smooth operation.
11.What is the term for the process of removing moisture and air from a
refrigeration system?
o Answer: Evacuation, which prevents contamination and ensures
efficient operation.
12.What is the main environmental concern associated with
refrigerants?
o Answer: Global warming potential and ozone depletion.
13.What is the term for the temperature at which a refrigerant changes
from liquid to gas?
o Answer: Boiling point.
14.What is the purpose of a filter-drier in a refrigeration system?
o Answer: To remove moisture and contaminants from the
refrigerant.
15.What is the term for the pressure difference between the high side
and low side of a refrigeration system?
o Answer: Differential pressure.
16.What happens when a refrigeration system is overcharged with
refrigerant?
o Answer: It can cause high pressures, reduced efficiency, and
potential damage to components.
, 17.What is the function of a sight glass in a refrigeration system?
o Answer: To provide a visual indicator of refrigerant flow and
moisture content.
18.What is the purpose of a thermal expansion valve?
o Answer: To regulate refrigerant flow based on temperature
changes in the evaporator.
19.Why is proper airflow important in refrigeration systems?
o Answer: It ensures efficient heat transfer and prevents system
overheating or freezing.
20.What is the impact of a dirty condenser coil on system performance?
o Answer: Reduced heat transfer, increased energy consumption,
and potential compressor failure.
What is the purpose of a defrost cycle in refrigeration systems?
• Answer: To remove ice buildup from the evaporator coils, ensuring
efficient operation.
What is the term for the refrigerant's state when it leaves the
evaporator?
• Answer: Vapor, as it absorbs heat and evaporates.
What is the impact of low refrigerant levels in a system?
• Answer: Reduced cooling efficiency and potential damage to the
compressor.
What is the purpose of a pressure switch in a refrigeration system?
• Answer: To monitor and control system pressures for safe operation.
What is the term for the temperature difference between the refrigerant
and the surrounding air or water?
• Answer: Temperature differential.
What is the function of a liquid line filter-drier?
100% VERIFIED ANSWERS LATEST UPDATED
150 QUESTIONS AND ANSWERS
1. What is the primary function of a refrigeration system?
o Answer: To cool a space by removing heat from it and transferring
it elsewhere.
2. Which component in a refrigeration system compresses the
refrigerant?
o Answer: The compressor increases the pressure and temperature of
the refrigerant before it enters the condenser.
3. What is the purpose of the evaporator in a refrigeration system?
o Answer: To absorb heat from the space being cooled, causing the
refrigerant to evaporate and carry heat away.
4. Which type of refrigerant is commonly used in modern refrigeration
systems?
o Answer: R-134a, due to its efficiency and lower environmental
impact.
5. What is the role of the condenser in a refrigeration system?
o Answer: To release heat to the surroundings, cooling the
refrigerant and converting it from gas to liquid.
6. What is superheat in a refrigeration system?
o Answer: The heat added to the refrigerant after it evaporates,
ensuring full vaporization before entering the compressor.
7. What is the function of the expansion valve in a refrigeration system?
, o Answer: To regulate the flow of refrigerant into the evaporator,
reducing its pressure and temperature.
8. Which law of thermodynamics is primarily applied in refrigeration
systems?
o Answer: The second law, governing the transfer of heat from a
cooler space to a warmer space using work.
9. What is the typical unit used to measure refrigeration capacity?
o Answer: BTU/hr (British Thermal Units per hour).
10.What is the purpose of refrigerant oil in a refrigeration system?
o Answer: To lubricate the compressor, reducing wear and ensuring
smooth operation.
11.What is the term for the process of removing moisture and air from a
refrigeration system?
o Answer: Evacuation, which prevents contamination and ensures
efficient operation.
12.What is the main environmental concern associated with
refrigerants?
o Answer: Global warming potential and ozone depletion.
13.What is the term for the temperature at which a refrigerant changes
from liquid to gas?
o Answer: Boiling point.
14.What is the purpose of a filter-drier in a refrigeration system?
o Answer: To remove moisture and contaminants from the
refrigerant.
15.What is the term for the pressure difference between the high side
and low side of a refrigeration system?
o Answer: Differential pressure.
16.What happens when a refrigeration system is overcharged with
refrigerant?
o Answer: It can cause high pressures, reduced efficiency, and
potential damage to components.
, 17.What is the function of a sight glass in a refrigeration system?
o Answer: To provide a visual indicator of refrigerant flow and
moisture content.
18.What is the purpose of a thermal expansion valve?
o Answer: To regulate refrigerant flow based on temperature
changes in the evaporator.
19.Why is proper airflow important in refrigeration systems?
o Answer: It ensures efficient heat transfer and prevents system
overheating or freezing.
20.What is the impact of a dirty condenser coil on system performance?
o Answer: Reduced heat transfer, increased energy consumption,
and potential compressor failure.
What is the purpose of a defrost cycle in refrigeration systems?
• Answer: To remove ice buildup from the evaporator coils, ensuring
efficient operation.
What is the term for the refrigerant's state when it leaves the
evaporator?
• Answer: Vapor, as it absorbs heat and evaporates.
What is the impact of low refrigerant levels in a system?
• Answer: Reduced cooling efficiency and potential damage to the
compressor.
What is the purpose of a pressure switch in a refrigeration system?
• Answer: To monitor and control system pressures for safe operation.
What is the term for the temperature difference between the refrigerant
and the surrounding air or water?
• Answer: Temperature differential.
What is the function of a liquid line filter-drier?
