Refrigeration Final Exam Questions & Answers 2026 | High-
Yield Review | Graded A+
1. Describe the significance of the suction pressure and ambient temperature in
determining the state of refrigerant 410A in a refrigeration system.
The suction pressure is irrelevant to the refrigerant state; only ambient
temperature matters.
The suction pressure and ambient temperature help determine
whether the refrigerant is in a superheated, saturated, or subcooled
state, which affects system efficiency.
The suction pressure indicates the refrigerant's temperature, but
ambient temperature does not affect it.
The state of refrigerant is solely determined by the compressor speed.
2. Describe the significance of maintaining a valid ODP card for professionals
working with refrigerants.
The ODP card is irrelevant to environmental regulations.
An expired ODP card can still be used for refrigerant handling.
An ODP card is only necessary for initial training and not for ongoing
work.
Maintaining a valid ODP card ensures compliance with
environmental regulations and demonstrates the individual's
qualifications to handle refrigerants safely.
3. Which refrigerant is known for having a lower ozone depletion potential
compared to others?
HCFC-22
HFC-410A
, R-134a
CFC-12
4. An air conditioning system charged with R-410A is operating with a suction
pressure of 130 psig which equates to a 45°F saturation temperature. If the
manufacturer calls for a 15°F superheat, what should the suction line
temperature be?
45°F - 15°F = 30°F suction line temperature
45°F + 15°F = 60°F suction line temperature
130 psig + 15°F = 190°F suction line temperature
130 psig - 15°F = 115°F suction line temperature
5. Describe the significance of the boiling point of refrigerants like R134A in
refrigeration systems.
The boiling point indicates the refrigerant's environmental impact.
The boiling point affects the color of the refrigerant.
The boiling point of refrigerants like R134A is crucial as it
determines the temperature at which the refrigerant changes from
liquid to gas, impacting the efficiency of the refrigeration cycle.
The boiling point is irrelevant to refrigeration systems.
6. What is one consequence, besides a fine, for a person convicted of releasing
a CFC/HCFC/HFC into the atmosphere?
Mandatory training
Community service
License suspension
Imprisonment
,7. If a refrigeration technician is tasked with upgrading an old system using
CFC-12 to a more environmentally friendly refrigerant, which of the following
would be the most appropriate choice?
R-134a
HFC-410A
HCFC-22
CFC-12
8. Describe the environmental implications of releasing CFCs, HCFCs, and HFCs
into the atmosphere.
Releasing these refrigerants contributes to ozone depletion and
global warming.
They improve air quality and reduce greenhouse gases.
They have no significant environmental impact.
They are beneficial for the environment.
9. Describe how the return air temperature affects the saturated suction
pressure of R22 in a refrigeration system.
Higher return air temperatures lead to lower saturated suction
pressures for R22.
The return air temperature does not affect the saturated suction
pressure of R22.
The saturated suction pressure of R22 is constant regardless of return
air temperature.
As the return air temperature increases, the saturated suction
pressure of R22 also increases due to the relationship between
temperature and pressure in refrigerants.
, 10. Specific heat is defined as:
the amount of energy needed to evaporate one gram of liquid.
the amount of heat needed to raise the temperature of one gram of
a substance by one degree Celsius
the amount of energy needed to break hydrogen bonds that hold
water molecules together.
the amount of heat needed to convert one gram of water from one
state to any other state.
11. When evaluating the operation of an AC system during the summer months,
the temperature differential between the supply and renew air should
typically be:
15- 30 F
15-20 F
20-25 F
10-15 F
12. Describe the role of a manometer in a refrigeration system and why it is
important.
A manometer is used to measure the volume of refrigerant in the
system.
A manometer regulates the temperature of the refrigerant to prevent
freezing.
A manometer monitors the electrical current flowing through the
refrigeration unit.
A manometer measures the pressure in a refrigeration system,
which is crucial for ensuring the system operates within safe and
Yield Review | Graded A+
1. Describe the significance of the suction pressure and ambient temperature in
determining the state of refrigerant 410A in a refrigeration system.
The suction pressure is irrelevant to the refrigerant state; only ambient
temperature matters.
The suction pressure and ambient temperature help determine
whether the refrigerant is in a superheated, saturated, or subcooled
state, which affects system efficiency.
The suction pressure indicates the refrigerant's temperature, but
ambient temperature does not affect it.
The state of refrigerant is solely determined by the compressor speed.
2. Describe the significance of maintaining a valid ODP card for professionals
working with refrigerants.
The ODP card is irrelevant to environmental regulations.
An expired ODP card can still be used for refrigerant handling.
An ODP card is only necessary for initial training and not for ongoing
work.
Maintaining a valid ODP card ensures compliance with
environmental regulations and demonstrates the individual's
qualifications to handle refrigerants safely.
3. Which refrigerant is known for having a lower ozone depletion potential
compared to others?
HCFC-22
HFC-410A
, R-134a
CFC-12
4. An air conditioning system charged with R-410A is operating with a suction
pressure of 130 psig which equates to a 45°F saturation temperature. If the
manufacturer calls for a 15°F superheat, what should the suction line
temperature be?
45°F - 15°F = 30°F suction line temperature
45°F + 15°F = 60°F suction line temperature
130 psig + 15°F = 190°F suction line temperature
130 psig - 15°F = 115°F suction line temperature
5. Describe the significance of the boiling point of refrigerants like R134A in
refrigeration systems.
The boiling point indicates the refrigerant's environmental impact.
The boiling point affects the color of the refrigerant.
The boiling point of refrigerants like R134A is crucial as it
determines the temperature at which the refrigerant changes from
liquid to gas, impacting the efficiency of the refrigeration cycle.
The boiling point is irrelevant to refrigeration systems.
6. What is one consequence, besides a fine, for a person convicted of releasing
a CFC/HCFC/HFC into the atmosphere?
Mandatory training
Community service
License suspension
Imprisonment
,7. If a refrigeration technician is tasked with upgrading an old system using
CFC-12 to a more environmentally friendly refrigerant, which of the following
would be the most appropriate choice?
R-134a
HFC-410A
HCFC-22
CFC-12
8. Describe the environmental implications of releasing CFCs, HCFCs, and HFCs
into the atmosphere.
Releasing these refrigerants contributes to ozone depletion and
global warming.
They improve air quality and reduce greenhouse gases.
They have no significant environmental impact.
They are beneficial for the environment.
9. Describe how the return air temperature affects the saturated suction
pressure of R22 in a refrigeration system.
Higher return air temperatures lead to lower saturated suction
pressures for R22.
The return air temperature does not affect the saturated suction
pressure of R22.
The saturated suction pressure of R22 is constant regardless of return
air temperature.
As the return air temperature increases, the saturated suction
pressure of R22 also increases due to the relationship between
temperature and pressure in refrigerants.
, 10. Specific heat is defined as:
the amount of energy needed to evaporate one gram of liquid.
the amount of heat needed to raise the temperature of one gram of
a substance by one degree Celsius
the amount of energy needed to break hydrogen bonds that hold
water molecules together.
the amount of heat needed to convert one gram of water from one
state to any other state.
11. When evaluating the operation of an AC system during the summer months,
the temperature differential between the supply and renew air should
typically be:
15- 30 F
15-20 F
20-25 F
10-15 F
12. Describe the role of a manometer in a refrigeration system and why it is
important.
A manometer is used to measure the volume of refrigerant in the
system.
A manometer regulates the temperature of the refrigerant to prevent
freezing.
A manometer monitors the electrical current flowing through the
refrigeration unit.
A manometer measures the pressure in a refrigeration system,
which is crucial for ensuring the system operates within safe and
