EPA 608 Universal Exam 2026 | Real Exam Questions &
Verified Answers | Complete HVAC Certification Prep
1. Azeotropic refrigerant mixtures
are more stable than non-azeotropic mixtures
Must only be charged as a liquid
Must only be charged as a superheated vapor
Act like a single component refrigerant and can be charged as
either a liquid or vapor
2. A dehydrator installed in a refrigeration system is used to remove _.
refrigerant from the oil
oil from the refrigerant
moisture from the system
noncondensable gases and vapors
3. Why is it important to reduce the internal pressure of a disposable cylinder to
zero before scrapping it?
It is a requirement for recycling all types of cylinders.
It helps in identifying the type of refrigerant inside the cylinder.
Reducing the internal pressure to zero ensures safety by preventing
accidental release of refrigerants.
It allows for easier transportation of the cylinder.
4. What is the primary use of disposable refrigerant containers in refrigeration
practices?
, To increase the pressure of refrigerants.
To dispose of used refrigerants improperly.
To mix different types of refrigerants.
To safely store and transport refrigerants.
5. Why are CFCs able to reach the stratosphere while most other compounds
cannot?
they have a relatively long lifetime
they do not absorb infrared radiation
they are relatively light (less dense)
They repel sunlight
6. Which refrigerant is known for being a common HCFC used in air
conditioning systems?
R-12
R-22
R-134a
R-410A
7. Describe the significance of HCFC refrigerants in relation to environmental
regulations.
HCFC refrigerants are only used in commercial refrigeration and have
no environmental impact.
HCFC refrigerants are preferred for their efficiency and are not
regulated.
Verified Answers | Complete HVAC Certification Prep
1. Azeotropic refrigerant mixtures
are more stable than non-azeotropic mixtures
Must only be charged as a liquid
Must only be charged as a superheated vapor
Act like a single component refrigerant and can be charged as
either a liquid or vapor
2. A dehydrator installed in a refrigeration system is used to remove _.
refrigerant from the oil
oil from the refrigerant
moisture from the system
noncondensable gases and vapors
3. Why is it important to reduce the internal pressure of a disposable cylinder to
zero before scrapping it?
It is a requirement for recycling all types of cylinders.
It helps in identifying the type of refrigerant inside the cylinder.
Reducing the internal pressure to zero ensures safety by preventing
accidental release of refrigerants.
It allows for easier transportation of the cylinder.
4. What is the primary use of disposable refrigerant containers in refrigeration
practices?
, To increase the pressure of refrigerants.
To dispose of used refrigerants improperly.
To mix different types of refrigerants.
To safely store and transport refrigerants.
5. Why are CFCs able to reach the stratosphere while most other compounds
cannot?
they have a relatively long lifetime
they do not absorb infrared radiation
they are relatively light (less dense)
They repel sunlight
6. Which refrigerant is known for being a common HCFC used in air
conditioning systems?
R-12
R-22
R-134a
R-410A
7. Describe the significance of HCFC refrigerants in relation to environmental
regulations.
HCFC refrigerants are only used in commercial refrigeration and have
no environmental impact.
HCFC refrigerants are preferred for their efficiency and are not
regulated.
