EPA 608 CORE | NEWEST| 2025/ 2026
QUESTIONS WITH VERIFIED
ANSWERS
What characteristic(s) of CFCs make them more likely to reach the stratosphere than most other
compounds containing chlorine? - correct answer -refrigerants that contain chlorine but not
hydrogen are so stable that they do not break down in the lower atmosphere after being
released. the chlorine or bromine reacts with ozone, causing it to change back to oxygen, thus
destroying the ozone layer.
A system is dehydrated to: - correct answer -remove water and water vapor
What refrigerant listed is a "low-pressure refrigerant" under EPA's refrigerant recycling
regulations?
R-22, R-123, R-134a or R-500 - correct answer -R-123
Which of the following is a "high-pressure refrigerant" under EPA's refrigerant recycling
regulations? R-11, R-22, R-113 or R-123 - correct answer -R-22
,When dealing with small systems, how many different refrigerants may be recovered into the
same cylinder? - correct answer -only one
The evacuation of a system is a method of: - correct answer -dehydration
This chemical was found in the upper stratosphere and that indicates that the ozone layer is
being destroyed. chlorine monoxide,
carbon monoxide,
carbon dioxide,
or nitrogen dioxide - correct answer -chlorine monoxide
Which refrigerant contains a CFC?
R-12, R-22, R-134a, R-410a - correct answer -R-12
According to the EPA, of the refrigerants listed below, which types of refrigerants will not
contribute to global warming? CFCs, HCFCs, HFCs, the all contribute to global warming - correct
answer -they all contribute to global warming
According to the EPA, an oil sample should be taken for which of the following reasons?
- new filter-drier has been installed,
- The system had a leak or a major component failure,
-system not cooling properly,
,-recycled refrigerant was added to the system - correct answer -the system had a leak or a
major component failure
A refillable refrigerant cylinder must never be filled to more than _______ of its capacity by
weight: - correct answer -80%
Which of the following is a "very high-pressure refrigerant" under EPA's refrigerant recycling
regulations?
R-22, R-134a, R-13, R-500 - correct answer -R-13
In a vapor compression refrigeration system, cooling occurs when: - correct answer -refrigerant
liquid turns to a vapor
87. What statement is true about an azeotropic refrigerant mixture?
it is always made from just two components.,
it has a pressure andtemperature curve identical to one of its components.,
it is a mixture that is always made from at least three component refrigerants.,
it is a mixture that acts like a single-component refrigerant over its entire range. - correct
answer -It is a mixture that acts like a single-component refrigerant over its entire range
What is one of the most serious results of damage to the ozone layer? - correct answer -
increase in human skin cancer
, When moisture exists in an operating system, which of the following is the most likely to occur?
copper tubes and fittings will rust, compressor discharge valves will freeze up, acid will form,
compressor head pressures will rise - correct answer -acid will form
Each chlorine atom in the stratosphere can destroy ______ ozone molecules. - correct answer -
100,000
91. State and local governments can make state laws that: - correct answer -◦follow the clean air
act/EPA regulations
◦contain stricter regulations than the clean air act/EPA regulations
It is important not to mix R-22 and R-410a refrigerants in the same container because - correct
answer -the mixture may be impossible to reclaim
93. The term used to describe the fact that a refrigerant blend has a range of boiling or
condensing points at a constant pressure is: - correct answer -temperature glide
To scrap a disposable cylinder, the internal cylinder pressure should be reduced to at least: -
correct answer -0 psig
QUESTIONS WITH VERIFIED
ANSWERS
What characteristic(s) of CFCs make them more likely to reach the stratosphere than most other
compounds containing chlorine? - correct answer -refrigerants that contain chlorine but not
hydrogen are so stable that they do not break down in the lower atmosphere after being
released. the chlorine or bromine reacts with ozone, causing it to change back to oxygen, thus
destroying the ozone layer.
A system is dehydrated to: - correct answer -remove water and water vapor
What refrigerant listed is a "low-pressure refrigerant" under EPA's refrigerant recycling
regulations?
R-22, R-123, R-134a or R-500 - correct answer -R-123
Which of the following is a "high-pressure refrigerant" under EPA's refrigerant recycling
regulations? R-11, R-22, R-113 or R-123 - correct answer -R-22
,When dealing with small systems, how many different refrigerants may be recovered into the
same cylinder? - correct answer -only one
The evacuation of a system is a method of: - correct answer -dehydration
This chemical was found in the upper stratosphere and that indicates that the ozone layer is
being destroyed. chlorine monoxide,
carbon monoxide,
carbon dioxide,
or nitrogen dioxide - correct answer -chlorine monoxide
Which refrigerant contains a CFC?
R-12, R-22, R-134a, R-410a - correct answer -R-12
According to the EPA, of the refrigerants listed below, which types of refrigerants will not
contribute to global warming? CFCs, HCFCs, HFCs, the all contribute to global warming - correct
answer -they all contribute to global warming
According to the EPA, an oil sample should be taken for which of the following reasons?
- new filter-drier has been installed,
- The system had a leak or a major component failure,
-system not cooling properly,
,-recycled refrigerant was added to the system - correct answer -the system had a leak or a
major component failure
A refillable refrigerant cylinder must never be filled to more than _______ of its capacity by
weight: - correct answer -80%
Which of the following is a "very high-pressure refrigerant" under EPA's refrigerant recycling
regulations?
R-22, R-134a, R-13, R-500 - correct answer -R-13
In a vapor compression refrigeration system, cooling occurs when: - correct answer -refrigerant
liquid turns to a vapor
87. What statement is true about an azeotropic refrigerant mixture?
it is always made from just two components.,
it has a pressure andtemperature curve identical to one of its components.,
it is a mixture that is always made from at least three component refrigerants.,
it is a mixture that acts like a single-component refrigerant over its entire range. - correct
answer -It is a mixture that acts like a single-component refrigerant over its entire range
What is one of the most serious results of damage to the ozone layer? - correct answer -
increase in human skin cancer
, When moisture exists in an operating system, which of the following is the most likely to occur?
copper tubes and fittings will rust, compressor discharge valves will freeze up, acid will form,
compressor head pressures will rise - correct answer -acid will form
Each chlorine atom in the stratosphere can destroy ______ ozone molecules. - correct answer -
100,000
91. State and local governments can make state laws that: - correct answer -◦follow the clean air
act/EPA regulations
◦contain stricter regulations than the clean air act/EPA regulations
It is important not to mix R-22 and R-410a refrigerants in the same container because - correct
answer -the mixture may be impossible to reclaim
93. The term used to describe the fact that a refrigerant blend has a range of boiling or
condensing points at a constant pressure is: - correct answer -temperature glide
To scrap a disposable cylinder, the internal cylinder pressure should be reduced to at least: -
correct answer -0 psig
