1|Page
SKILLCAT EPA 608 EXAM NEWEST ACTUAL EXAM
COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+ 2026/2027
Complex customized appliances used in the chemical, pharmaceutical,
petrochemical industries, and in manufacturing. The sector includes
industrial ice machines and ice rinks. ......ANSWER......Industrial Process
Refrigeration
One of a group of substances having the same combination of elements
but arranged spatially in different ways. ......ANSWER......Isomer
A combination shut-off and service value typically used on the inlet and
outlet of a compressor, and on the inlet and outlet of a packaged
condensing units. ......ANSWER......King Value
The rate at which an appliance is losing refrigerant, projected over the
next 12-months. The leak rate is expressed in terms of the percentage
of the appliance's full charge that would be lost in the next 12-months if
the current rate of loss were to continue over that period. The rate is
calculated using the following formula: refrigerant added over total
charge x 365 days per year over D x 100 ......ANSWER......Leak Rate
pg. 1
,2|Page
The piping used to connect the outdoor unit (referred to as the
condensing unit) to the indoor unit (sometime referred to as fan coil
unit). It consists of two lines; the smaller, high-pressure liquid
refrigerant line (which brings condensed refrigerant to the evaporator)
and the larger, insulated low- pressure line (which brings cooler
evaporated refrigerant vapor back to the compressor).
......ANSWER......Line set
Any device that is intended to establish a connection between hoses,
appliances, or recovery/ recycling machines, and that is designed to
close automatically or to be closed manually when disconnected to
minimize the release of refrigerant from hoses, appliances, and
recovery or recycling machines. ......ANSWER......Low-Loss Fitting
An appliance that uses a refrigerant with a liquid phase saturation
pressure below 45 psia at 104 F. This definition includes but not limited
to appliances using R-11, R-123, and R-113. ......ANSWER......Low-
pressure appliance
An appliance that uses a refrigerant with a liquid phase saturation
pressure between 45 psia and 170 psia at 104 F. This definition includes
but not limited to appliances using R-114, R-124, R-12, R-401C, R-406A,
and R-500. ......ANSWER......Medium-pressure appliance
One thousandth (1/1,000) of a millimeter of mercury vacuum.
......ANSWER......Micron
pg. 2
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A blend of two or more components that do not a have fixed proportion
to one another and that no matter how well blended, they still retain a
separate existence ( oil and water, for example).
......ANSWER......Mixture
Mechanical vapor compression refrigeration equipment used to cool
the driver or passenger compartment of any motor vehicle. This
definition is NOT intended to encompass the hermetically sealed
refrigeration system used on motor vehicles for refrigerated cargo or
the air conditioning systems on passenger buses.
......ANSWER......Motor Vehicle Air Conditioner (MVAC)
a synonym for zeotropic, which is the preferred term though less
commonly used as a descriptor. Zeotropic refers to blends comprising
multiple components of different volatilities that, when used in
refrigeration cycles, change volumetric composition and saturation
temperatures (exhibit temperature glide) as they evaporate (boil) or
condense at constant pressure. These refrigerants are given a 400-series
ASHRAE designation. ......ANSWER......Non-Azeotropic Refrigerant
Gases that will not condense anywhere in the vapor compression
system and typically accumulate in the condenser. ......ANSWER......Non-
condensables
The quantity of refrigerant within the appliance or appliance
component when the appliance is operating with a full charge of
refrigerant. ......ANSWER......Normal Charge
pg. 3
, 4|Page
Any service, maintenance, or repair on an appliance that could be
reasonably expected to release refrigerant from the appliance to the
atmosphere unless the refrigerant was previously recovered from the
appliance. ......ANSWER......Opening an Appliance
A passive throttling device, comprised of a small opening, 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. ......ANSWER......Orifice Plate
Any individual or legal entity, including an individual corporation,
partnership, association, state, municipality, political subdivision of a
state, Indian tribe, and any agency, department, or instrumentality of
the United States and any officer, agent, or employee thereof.
......ANSWER......Person
A length of tubing that provides access to the refrigerant inside a small
appliance or room air conditioner that can be resealed at the conclusion
of repair or service. ......ANSWER......Process Stub
The absolute pressure in pounds per square inch, where 0 PSIA
corresponds to 29.9 inches of mercury vacuum, and 14.7 PSIA
corresponds to 0 ......ANSWER......PSIA
pg. 4
SKILLCAT EPA 608 EXAM NEWEST ACTUAL EXAM
COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+ 2026/2027
Complex customized appliances used in the chemical, pharmaceutical,
petrochemical industries, and in manufacturing. The sector includes
industrial ice machines and ice rinks. ......ANSWER......Industrial Process
Refrigeration
One of a group of substances having the same combination of elements
but arranged spatially in different ways. ......ANSWER......Isomer
A combination shut-off and service value typically used on the inlet and
outlet of a compressor, and on the inlet and outlet of a packaged
condensing units. ......ANSWER......King Value
The rate at which an appliance is losing refrigerant, projected over the
next 12-months. The leak rate is expressed in terms of the percentage
of the appliance's full charge that would be lost in the next 12-months if
the current rate of loss were to continue over that period. The rate is
calculated using the following formula: refrigerant added over total
charge x 365 days per year over D x 100 ......ANSWER......Leak Rate
pg. 1
,2|Page
The piping used to connect the outdoor unit (referred to as the
condensing unit) to the indoor unit (sometime referred to as fan coil
unit). It consists of two lines; the smaller, high-pressure liquid
refrigerant line (which brings condensed refrigerant to the evaporator)
and the larger, insulated low- pressure line (which brings cooler
evaporated refrigerant vapor back to the compressor).
......ANSWER......Line set
Any device that is intended to establish a connection between hoses,
appliances, or recovery/ recycling machines, and that is designed to
close automatically or to be closed manually when disconnected to
minimize the release of refrigerant from hoses, appliances, and
recovery or recycling machines. ......ANSWER......Low-Loss Fitting
An appliance that uses a refrigerant with a liquid phase saturation
pressure below 45 psia at 104 F. This definition includes but not limited
to appliances using R-11, R-123, and R-113. ......ANSWER......Low-
pressure appliance
An appliance that uses a refrigerant with a liquid phase saturation
pressure between 45 psia and 170 psia at 104 F. This definition includes
but not limited to appliances using R-114, R-124, R-12, R-401C, R-406A,
and R-500. ......ANSWER......Medium-pressure appliance
One thousandth (1/1,000) of a millimeter of mercury vacuum.
......ANSWER......Micron
pg. 2
,3|Page
A blend of two or more components that do not a have fixed proportion
to one another and that no matter how well blended, they still retain a
separate existence ( oil and water, for example).
......ANSWER......Mixture
Mechanical vapor compression refrigeration equipment used to cool
the driver or passenger compartment of any motor vehicle. This
definition is NOT intended to encompass the hermetically sealed
refrigeration system used on motor vehicles for refrigerated cargo or
the air conditioning systems on passenger buses.
......ANSWER......Motor Vehicle Air Conditioner (MVAC)
a synonym for zeotropic, which is the preferred term though less
commonly used as a descriptor. Zeotropic refers to blends comprising
multiple components of different volatilities that, when used in
refrigeration cycles, change volumetric composition and saturation
temperatures (exhibit temperature glide) as they evaporate (boil) or
condense at constant pressure. These refrigerants are given a 400-series
ASHRAE designation. ......ANSWER......Non-Azeotropic Refrigerant
Gases that will not condense anywhere in the vapor compression
system and typically accumulate in the condenser. ......ANSWER......Non-
condensables
The quantity of refrigerant within the appliance or appliance
component when the appliance is operating with a full charge of
refrigerant. ......ANSWER......Normal Charge
pg. 3
, 4|Page
Any service, maintenance, or repair on an appliance that could be
reasonably expected to release refrigerant from the appliance to the
atmosphere unless the refrigerant was previously recovered from the
appliance. ......ANSWER......Opening an Appliance
A passive throttling device, comprised of a small opening, 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. ......ANSWER......Orifice Plate
Any individual or legal entity, including an individual corporation,
partnership, association, state, municipality, political subdivision of a
state, Indian tribe, and any agency, department, or instrumentality of
the United States and any officer, agent, or employee thereof.
......ANSWER......Person
A length of tubing that provides access to the refrigerant inside a small
appliance or room air conditioner that can be resealed at the conclusion
of repair or service. ......ANSWER......Process Stub
The absolute pressure in pounds per square inch, where 0 PSIA
corresponds to 29.9 inches of mercury vacuum, and 14.7 PSIA
corresponds to 0 ......ANSWER......PSIA
pg. 4
