EPA 608 Vocabulary Exam Questions with
complete Solutions latest 2025/2026 A+
Graded 100% Verified.
appliance - ANS- Any device that contains and uses a refrigerant for household or
commercial purposes, including any air conditioner, refrigerator, chiller, or freezer. EPA
interprets this definition to include all air-conditioning and refrigerant equipment except
units designed and used exclusively for military purposes.
asphyxia - ANS- The displacement of the oxygen in a room by the denser refrigerant.
Azeotrope - ANS- A blend of two or more components whose equilibrium vapor phase
and liquid phase compositions are the same at a given pressure. These refrigerants are
given a 500-series ASHRAE designation and behave like a single refrigerant. They can be
charged as a liquid or vapor.
Bubble Point - ANS- The temperature at which a non-azeotropic blend first begins to
evaporate (boil)
Capillary Tube - ANS- A passive throttling device comprised of a very small diameter
long tube located upstream of the evaporator that drops the pressure in the system,
causing refrigerant to flash into a two-phase mixture. It does not actively control the
pressure drop to maintain a prescribed superheat at the exit of the evaporator.
Class I Refrigerant - ANS- Refrigerants that have an ODP value greater than 0.2, and
consist of ALL CFCs
Class II Refrigerant - ANS- Refrigerants that have an ODP less than 0.2, and consist of all
HCFCs
Commercial Refrigeration - ANS- Refrigeration appliances used in retail food and cold
storage warehouse sectors. Retail food includes the refrigeration equipment found in
supermarkets, convenience stores. restaurants, and other food service establishment.
cold storage includes the equipment used to store meat, produce, dairy products, and
other perishable goods. all of this type of equipment contains large refrigerant charges.
typically over 75 pounds.
, Compound - ANS- A substance formed by a union of two or more elements in a definite
proportion by weight.
Dehydrate - ANS- To remove water from the system.
Deep Vacuum - ANS- The evacuation of a system down to a low vacuum, typically below
500 microns, with the goal of removing non-condensable gases as well as evaporating
and removing water from the system.
Dew Point - ANS- The temperature at which the non-azeotropic blend first begins to
condense.
Disposal - ANS- The process leading to and including any of the following:
1. The discharging, depositing, dumping, or placing of any discarded appliance into or on
any land or water.
2. The disassembly of any appliance for discharging, depositing, dumping, or placing of
its discarded component parts into or on any land or water.
3. The disassembly of any appliance for reuse of its component parts.
Electronic Vacuum Gauge or Micron Gauge - ANS- An electronic vacuum gauge that
displays the vacuum level directly in microns and is the only accurate field method to
determine the evacuation level of a deep vacuum.
Evacuation - ANS- The process of extracting any air, non-condensable gases, or water
from the system and thereby reducing the pressure to some value below 0 psig.
EXV - ANS- The abbreviation for an Electronic Expansion Valve, a throttling device
located upstream of the evaporator, that actively controls the pressure drop to maintain a
prescribed superheat at the exit of the evaporator.
Fractionation - ANS- The separation of a liquid mixture into separate parts by the
preferential evaporation of the more volatile component.
Halocarbon - ANS- A halogenated hydrocarbon containing one or more of three
halogens: fluorine, chlorine, and bromine. Hydrogen may or may not be present.
High-pressure appliance - ANS- An appliance that uses a refrigerant with a liquid phase
saturation pressure between 170 psia and 355 psia at 104 degrees F
Hydrocarbon - ANS- Compounds composed of only carbon and hydrogen.
Hygroscopic - ANS- an affinity for water, so hygroscopic oils are oils that absorb
moisture
complete Solutions latest 2025/2026 A+
Graded 100% Verified.
appliance - ANS- Any device that contains and uses a refrigerant for household or
commercial purposes, including any air conditioner, refrigerator, chiller, or freezer. EPA
interprets this definition to include all air-conditioning and refrigerant equipment except
units designed and used exclusively for military purposes.
asphyxia - ANS- The displacement of the oxygen in a room by the denser refrigerant.
Azeotrope - ANS- A blend of two or more components whose equilibrium vapor phase
and liquid phase compositions are the same at a given pressure. These refrigerants are
given a 500-series ASHRAE designation and behave like a single refrigerant. They can be
charged as a liquid or vapor.
Bubble Point - ANS- The temperature at which a non-azeotropic blend first begins to
evaporate (boil)
Capillary Tube - ANS- A passive throttling device comprised of a very small diameter
long tube located upstream of the evaporator that drops the pressure in the system,
causing refrigerant to flash into a two-phase mixture. It does not actively control the
pressure drop to maintain a prescribed superheat at the exit of the evaporator.
Class I Refrigerant - ANS- Refrigerants that have an ODP value greater than 0.2, and
consist of ALL CFCs
Class II Refrigerant - ANS- Refrigerants that have an ODP less than 0.2, and consist of all
HCFCs
Commercial Refrigeration - ANS- Refrigeration appliances used in retail food and cold
storage warehouse sectors. Retail food includes the refrigeration equipment found in
supermarkets, convenience stores. restaurants, and other food service establishment.
cold storage includes the equipment used to store meat, produce, dairy products, and
other perishable goods. all of this type of equipment contains large refrigerant charges.
typically over 75 pounds.
, Compound - ANS- A substance formed by a union of two or more elements in a definite
proportion by weight.
Dehydrate - ANS- To remove water from the system.
Deep Vacuum - ANS- The evacuation of a system down to a low vacuum, typically below
500 microns, with the goal of removing non-condensable gases as well as evaporating
and removing water from the system.
Dew Point - ANS- The temperature at which the non-azeotropic blend first begins to
condense.
Disposal - ANS- The process leading to and including any of the following:
1. The discharging, depositing, dumping, or placing of any discarded appliance into or on
any land or water.
2. The disassembly of any appliance for discharging, depositing, dumping, or placing of
its discarded component parts into or on any land or water.
3. The disassembly of any appliance for reuse of its component parts.
Electronic Vacuum Gauge or Micron Gauge - ANS- An electronic vacuum gauge that
displays the vacuum level directly in microns and is the only accurate field method to
determine the evacuation level of a deep vacuum.
Evacuation - ANS- The process of extracting any air, non-condensable gases, or water
from the system and thereby reducing the pressure to some value below 0 psig.
EXV - ANS- The abbreviation for an Electronic Expansion Valve, a throttling device
located upstream of the evaporator, that actively controls the pressure drop to maintain a
prescribed superheat at the exit of the evaporator.
Fractionation - ANS- The separation of a liquid mixture into separate parts by the
preferential evaporation of the more volatile component.
Halocarbon - ANS- A halogenated hydrocarbon containing one or more of three
halogens: fluorine, chlorine, and bromine. Hydrogen may or may not be present.
High-pressure appliance - ANS- An appliance that uses a refrigerant with a liquid phase
saturation pressure between 170 psia and 355 psia at 104 degrees F
Hydrocarbon - ANS- Compounds composed of only carbon and hydrogen.
Hygroscopic - ANS- an affinity for water, so hygroscopic oils are oils that absorb
moisture
