1|Page
EPA 608 Certification Exam Questions with 100%
Verified Correct Answers
How does ozone depletion affect humans? -
...ANSWER✓✓✓Increased risk of skin cancer and cataracts.
How many access valves are needed to recover refrigerant from a sealed
system with a restricted capillary tube? - ...ANSWER✓✓✓One access
valve is needed.
How many atoms of oxygen does ozone have? - ...ANSWER✓✓✓3
How many molecules of ozone can three molecules of chlorine destroy?
- ...ANSWER✓✓✓300,000.
How should refrigerant blends be charged? -
...ANSWER✓✓✓Refrigerant blends need to be charged as a liquid.
If a gas has a GWP of 50, does it mean it has 50 times less global
warming potential than carbon dioxide? - ...ANSWER✓✓✓False
If a refrigerant has a drop-in replacement, is a retrofit needed? -
,2|Page
...ANSWER✓✓✓No, if a refrigerant has a drop-in replacement, then no
retrofit is needed.
If a refrigerant has an ODP of 0.055, what can be inferred? -
...ANSWER✓✓✓It contains chlorine and could be R-22.
Is Alkylbenzene (AB) oil miscible in HCFC refrigerants? -
...ANSWER✓✓✓True, Alkylbenzene (AB) oil is miscible in HCFC
refrigerants.
Is ammonia safe to use as a natural refrigerant? -
...ANSWER✓✓✓False
Is an active recovery machine required for all systems? -
...ANSWER✓✓✓False, passive recovery is still applicable.
Is equipment that uses nitrogen as a refrigerant subject to Section 608
requirements? - ...ANSWER✓✓✓True.
Is it true that for the same substance, at the same temperature, the
average speed of molecules in a vapor is the same as in a liquid? -
...ANSWER✓✓✓False.
,3|Page
Is it true that in a zeotropic blend, all refrigerants have the same boiling
point? - ...ANSWER✓✓✓False, in a zeotropic blend, not all refrigerants
have the same boiling point.
Is R-1234yf miscible with any refrigerant oils? -
...ANSWER✓✓✓False, R-1234yf is not miscible with any refrigerant
oils.
Is R-404a commonly found in household refrigerators and freezers? -
...ANSWER✓✓✓No, it is not expected to be found in household
refrigerators and freezers.
Is R-407c an azeotropic blend? - ...ANSWER✓✓✓False, R-407c is not
an azeotropic blend.
Is R-407c used in new household refrigerators and freezers? -
...ANSWER✓✓✓No, it is not expected to be used in new household
refrigerators and freezers.
Is R-410a an A1 refrigerant? - ...ANSWER✓✓✓True
, 4|Page
Is R-450a an acceptable substitute for use in new household
refrigerators and freezers under SNAP? - ...ANSWER✓✓✓Yes, it is
acceptable.
Is the boiling point of most refrigerants 212 °F? -
...ANSWER✓✓✓False.
Is the lowest number for an ozone depletion potential (ODP) 1? -
...ANSWER✓✓✓False
Is the vapor leaving the compressor lower in pressure than the vapor
entering the compressor? - ...ANSWER✓✓✓False.
Is there evidence that refrigerants are in the stratosphere? -
...ANSWER✓✓✓Yes.
What absorbs and reflects harmful UV rays from the sun? -
...ANSWER✓✓✓Ozone, but ground level ozone does not.
What appliances do Section 608 regulations apply to? -
...ANSWER✓✓✓Freezers and other specified appliances.
What are considered de minimis releases of refrigerant? -
EPA 608 Certification Exam Questions with 100%
Verified Correct Answers
How does ozone depletion affect humans? -
...ANSWER✓✓✓Increased risk of skin cancer and cataracts.
How many access valves are needed to recover refrigerant from a sealed
system with a restricted capillary tube? - ...ANSWER✓✓✓One access
valve is needed.
How many atoms of oxygen does ozone have? - ...ANSWER✓✓✓3
How many molecules of ozone can three molecules of chlorine destroy?
- ...ANSWER✓✓✓300,000.
How should refrigerant blends be charged? -
...ANSWER✓✓✓Refrigerant blends need to be charged as a liquid.
If a gas has a GWP of 50, does it mean it has 50 times less global
warming potential than carbon dioxide? - ...ANSWER✓✓✓False
If a refrigerant has a drop-in replacement, is a retrofit needed? -
,2|Page
...ANSWER✓✓✓No, if a refrigerant has a drop-in replacement, then no
retrofit is needed.
If a refrigerant has an ODP of 0.055, what can be inferred? -
...ANSWER✓✓✓It contains chlorine and could be R-22.
Is Alkylbenzene (AB) oil miscible in HCFC refrigerants? -
...ANSWER✓✓✓True, Alkylbenzene (AB) oil is miscible in HCFC
refrigerants.
Is ammonia safe to use as a natural refrigerant? -
...ANSWER✓✓✓False
Is an active recovery machine required for all systems? -
...ANSWER✓✓✓False, passive recovery is still applicable.
Is equipment that uses nitrogen as a refrigerant subject to Section 608
requirements? - ...ANSWER✓✓✓True.
Is it true that for the same substance, at the same temperature, the
average speed of molecules in a vapor is the same as in a liquid? -
...ANSWER✓✓✓False.
,3|Page
Is it true that in a zeotropic blend, all refrigerants have the same boiling
point? - ...ANSWER✓✓✓False, in a zeotropic blend, not all refrigerants
have the same boiling point.
Is R-1234yf miscible with any refrigerant oils? -
...ANSWER✓✓✓False, R-1234yf is not miscible with any refrigerant
oils.
Is R-404a commonly found in household refrigerators and freezers? -
...ANSWER✓✓✓No, it is not expected to be found in household
refrigerators and freezers.
Is R-407c an azeotropic blend? - ...ANSWER✓✓✓False, R-407c is not
an azeotropic blend.
Is R-407c used in new household refrigerators and freezers? -
...ANSWER✓✓✓No, it is not expected to be used in new household
refrigerators and freezers.
Is R-410a an A1 refrigerant? - ...ANSWER✓✓✓True
, 4|Page
Is R-450a an acceptable substitute for use in new household
refrigerators and freezers under SNAP? - ...ANSWER✓✓✓Yes, it is
acceptable.
Is the boiling point of most refrigerants 212 °F? -
...ANSWER✓✓✓False.
Is the lowest number for an ozone depletion potential (ODP) 1? -
...ANSWER✓✓✓False
Is the vapor leaving the compressor lower in pressure than the vapor
entering the compressor? - ...ANSWER✓✓✓False.
Is there evidence that refrigerants are in the stratosphere? -
...ANSWER✓✓✓Yes.
What absorbs and reflects harmful UV rays from the sun? -
...ANSWER✓✓✓Ozone, but ground level ozone does not.
What appliances do Section 608 regulations apply to? -
...ANSWER✓✓✓Freezers and other specified appliances.
What are considered de minimis releases of refrigerant? -
