Refrigeration Practice Test Study Guide 2026 | Complete
Review | Graded A+
1. Describe the significance of pressure equalization in a refrigeration system
using a capillary tube metering device during off cycles.
Pressure equalization has no impact on system performance.
Pressure equalization helps prevent damage to the system and
ensures efficient operation when the system is restarted.
Pressure equalization only affects the compressor's lifespan.
Pressure equalization leads to increased energy consumption during
operation.
2. What is the typical temperature range that refrigeration systems are designed
to control?
Typically between 50°F and 70°F (10°C and 21°C)
Typically between 70°F and 100°F (21°C and 38°C)
Typically between 0°F and 32°F (-18°C and 0°C)
Typically between 32°F and 50°F (0°C and 10°C)
3. What is the name of the accessory that reduces hot gas pulsation in a
refrigeration system?
Condenser
Expansion valve
Evaporator
Pulsation dampener
,4. Describe the role of a heat exchanger in a closed loop cooling tower system
compared to an open loop system.
In both systems, the heat exchanger functions the same way by mixing
water with refrigerant.
In a closed loop system, the heat exchanger is unnecessary as all
cooling is done by the cooling tower.
In a closed loop system, the heat exchanger transfers heat without
mixing water, while in an open loop system, water is directly
exposed to the environment.
The heat exchanger is only used in open loop systems to cool the
refrigerant.
5. A Temperature scale that is absolute is based off of _.
the average kinetic energy
absolute zero
the temperature where water boils and freezes
an arbitrary number
6. A low pressure cut-out is used on a refrigeration system to stop the
compressor on:
any of the above
low oil pressure
low condenser water pressure
low refrigerant evaporation pressure
low compressor suction pressure
,7. If the blower fan in the indoor section of a split system refrigeration unit fails,
what immediate effect would this have on the system's operation?
The compressor would overheat due to lack of refrigerant flow.
The cooling tower would become ineffective, raising the overall
temperature.
The refrigerant would not evaporate properly, causing the system to
freeze.
The indoor air would not be circulated, leading to inadequate
cooling.
8. What term is used to describe the total heat content of a substance?
Enthalpy
Specific heat
Thermal energy
Entropy
9. What is the name of the safety device that prevents over-pressurization in
refrigeration systems?
Pressure relief valve
Thermostatic valve
Check valve
Expansion valve
10. What is the primary function of a suction accumulator in a refrigeration
system?
To increase the pressure of the refrigerant.
, To cool the refrigerant before it enters the evaporator.
To regulate the flow of refrigerant through the system.
To store refrigerant and prevent liquid from entering the
compressor.
11. What is the primary purpose of a defrost cycle in refrigeration systems?
To increase cooling efficiency
To regulate refrigerant flow
To enhance compressor function
To remove ice buildup
12. In a refrigeration system using a capillary tube metering device, what might
occur if the pressures do not equalize during off cycles?
The system could experience damage or inefficient operation upon
restart.
The refrigerant would flow continuously, causing overcooling.
The compressor would run more efficiently without any issues.
The evaporator would freeze completely, stopping all cooling.
13. Describe the role of the oil pump in the operation of a screw chiller.
The oil pump cools the refrigerant before it enters the condenser.
The oil pump removes excess refrigerant from the system.
The oil pump circulates oil from the separator back to the
compressor to ensure proper lubrication.
The oil pump increases the pressure of the refrigerant before it enters
the evaporator.
Review | Graded A+
1. Describe the significance of pressure equalization in a refrigeration system
using a capillary tube metering device during off cycles.
Pressure equalization has no impact on system performance.
Pressure equalization helps prevent damage to the system and
ensures efficient operation when the system is restarted.
Pressure equalization only affects the compressor's lifespan.
Pressure equalization leads to increased energy consumption during
operation.
2. What is the typical temperature range that refrigeration systems are designed
to control?
Typically between 50°F and 70°F (10°C and 21°C)
Typically between 70°F and 100°F (21°C and 38°C)
Typically between 0°F and 32°F (-18°C and 0°C)
Typically between 32°F and 50°F (0°C and 10°C)
3. What is the name of the accessory that reduces hot gas pulsation in a
refrigeration system?
Condenser
Expansion valve
Evaporator
Pulsation dampener
,4. Describe the role of a heat exchanger in a closed loop cooling tower system
compared to an open loop system.
In both systems, the heat exchanger functions the same way by mixing
water with refrigerant.
In a closed loop system, the heat exchanger is unnecessary as all
cooling is done by the cooling tower.
In a closed loop system, the heat exchanger transfers heat without
mixing water, while in an open loop system, water is directly
exposed to the environment.
The heat exchanger is only used in open loop systems to cool the
refrigerant.
5. A Temperature scale that is absolute is based off of _.
the average kinetic energy
absolute zero
the temperature where water boils and freezes
an arbitrary number
6. A low pressure cut-out is used on a refrigeration system to stop the
compressor on:
any of the above
low oil pressure
low condenser water pressure
low refrigerant evaporation pressure
low compressor suction pressure
,7. If the blower fan in the indoor section of a split system refrigeration unit fails,
what immediate effect would this have on the system's operation?
The compressor would overheat due to lack of refrigerant flow.
The cooling tower would become ineffective, raising the overall
temperature.
The refrigerant would not evaporate properly, causing the system to
freeze.
The indoor air would not be circulated, leading to inadequate
cooling.
8. What term is used to describe the total heat content of a substance?
Enthalpy
Specific heat
Thermal energy
Entropy
9. What is the name of the safety device that prevents over-pressurization in
refrigeration systems?
Pressure relief valve
Thermostatic valve
Check valve
Expansion valve
10. What is the primary function of a suction accumulator in a refrigeration
system?
To increase the pressure of the refrigerant.
, To cool the refrigerant before it enters the evaporator.
To regulate the flow of refrigerant through the system.
To store refrigerant and prevent liquid from entering the
compressor.
11. What is the primary purpose of a defrost cycle in refrigeration systems?
To increase cooling efficiency
To regulate refrigerant flow
To enhance compressor function
To remove ice buildup
12. In a refrigeration system using a capillary tube metering device, what might
occur if the pressures do not equalize during off cycles?
The system could experience damage or inefficient operation upon
restart.
The refrigerant would flow continuously, causing overcooling.
The compressor would run more efficiently without any issues.
The evaporator would freeze completely, stopping all cooling.
13. Describe the role of the oil pump in the operation of a screw chiller.
The oil pump cools the refrigerant before it enters the condenser.
The oil pump removes excess refrigerant from the system.
The oil pump circulates oil from the separator back to the
compressor to ensure proper lubrication.
The oil pump increases the pressure of the refrigerant before it enters
the evaporator.
