NEW EPA 608 EXAM PRACTICE
QUESTIONS 2025 UPDATED
Ozone depletion is caused by _______ in HFC refrigerants. - CORRECT
ANSWER>>>>chlorine
CFCs and HCFCs ________ making them capable capable of reaching the stratospheric ozone
layer. - CORRECT ANSWER>>>>do not dissolve in water or easily break down in the
atmosphere
According to the Rolanda-Molina theory, ________ are destroyed by each chlorine atom in the
stratosphere. - CORRECT ANSWER>>>>100,000 ozone molecules
The stratospheric ozone layer protects us from _______. - CORRECT ANSWER>>>>ultraviolet
radiation from the sun
Which health effect increases from loss of the stratospheric ozone layer? - CORRECT
ANSWER>>>>cases of cataracts or skin cancer
What proves that HCFCs are in the stratosphere? - CORRECT ANSWER>>>>HCFCs found in
air samples from the stratosphere.
What makes HFC refrigerants damaging to the environment? - CORRECT ANSWER>>>>They
can have very high global warming potentials.
_______ makes HFO refrigerants less flammable than HC refrigerants. - CORRECT
ANSWER>>>>Flourine
Which refrigerant contains chlorine? - CORRECT ANSWER>>>>R-12
HFO refrigerants are miscible in _______ lubricants. - CORRECT ANSWER>>>>POE
lubricants
An example of HcFC refrigerant is: ______ - CORRECT ANSWER>>>>R-123
What is being done in the U.S. to stop damage to the stratospheric ozone layer? - CORRECT
ANSWER>>>>Eliminating the use of CFCs and HCFCs refrigerants
EPA regulations require appliances to have _________. - CORRECT ANSWER>>>>a service
aperture or process hub
The release of any CFC, HCFC, or HFC refrigerant during _________ is illegal. - CORRECT
ANSWER>>>>theft of equipment
____________ is the only EPA SNAP approved "drop in" replacement for
, R-22. - CORRECT ANSWER>>>>There are no direct drop-in refrigerant substitutes
Ester-based oils like POE can be mixed with ________. - CORRECT ANSWER>>>>no other
oils
What provides the cooling in a vapor compression refrigeration system? - CORRECT
ANSWER>>>>The vaporization of the liquid refrigerant
An oil sample might be taken when __________. - CORRECT ANSWER>>>>a. moisture
and/or acid problems are suspected
b. oil sludge formation or oil waxing is suspected
c. residual acidic oil from a burn-out is suspected of contaminating the replacement oil
________ returns refrigerant to new product specifications and requires chemical analysis to
verify the purity to AHRI-700 standards. - CORRECT ANSWER>>>>reclaiming
The EPA considers _________ the most effective for locating the general area of a small leak. -
CORRECT ANSWER>>>>electronic or ultrasonic tester
Low ambient temperatures __________ recovery time. - CORRECT ANSWER>>>>increase
A system is considered dehydrated when _________. - CORRECT ANSWER>>>>a micron
gauge shows you have reached and held a vacuum of 500 microns or less with the vacuum pump
isolated from the system
If corrosion is discovered in the body of a relief valve, the valve must be _______. - CORRECT
ANSWER>>>>replaced
The fill level of a recovery cylinder can be determined by __________. - CORRECT
ANSWER>>>>a. mechanical-float or electronic shut-off devices
b. the weight of the cylinder
Before recharging any flammable hydrocarbon or HFO refrigerant, always ___________. -
CORRECT ANSWER>>>>a. electronically ground the recovery machine and recovery tank,
and verify the refrigeration system is grounded
b. install a fresh filter drier, successfully complete a
standing-pressure leak
A small appliance is defined as a system that is __________. - CORRECT
ANSWER>>>>manufactured, fully charged, and hermetically sealed in a factory with a charge
of 5 pounds or less
__________ is an approved refrigerant for new household refrigerators, freezers, and
combination refrigeration/freezers. - CORRECT ANSWER>>>>R-600a
QUESTIONS 2025 UPDATED
Ozone depletion is caused by _______ in HFC refrigerants. - CORRECT
ANSWER>>>>chlorine
CFCs and HCFCs ________ making them capable capable of reaching the stratospheric ozone
layer. - CORRECT ANSWER>>>>do not dissolve in water or easily break down in the
atmosphere
According to the Rolanda-Molina theory, ________ are destroyed by each chlorine atom in the
stratosphere. - CORRECT ANSWER>>>>100,000 ozone molecules
The stratospheric ozone layer protects us from _______. - CORRECT ANSWER>>>>ultraviolet
radiation from the sun
Which health effect increases from loss of the stratospheric ozone layer? - CORRECT
ANSWER>>>>cases of cataracts or skin cancer
What proves that HCFCs are in the stratosphere? - CORRECT ANSWER>>>>HCFCs found in
air samples from the stratosphere.
What makes HFC refrigerants damaging to the environment? - CORRECT ANSWER>>>>They
can have very high global warming potentials.
_______ makes HFO refrigerants less flammable than HC refrigerants. - CORRECT
ANSWER>>>>Flourine
Which refrigerant contains chlorine? - CORRECT ANSWER>>>>R-12
HFO refrigerants are miscible in _______ lubricants. - CORRECT ANSWER>>>>POE
lubricants
An example of HcFC refrigerant is: ______ - CORRECT ANSWER>>>>R-123
What is being done in the U.S. to stop damage to the stratospheric ozone layer? - CORRECT
ANSWER>>>>Eliminating the use of CFCs and HCFCs refrigerants
EPA regulations require appliances to have _________. - CORRECT ANSWER>>>>a service
aperture or process hub
The release of any CFC, HCFC, or HFC refrigerant during _________ is illegal. - CORRECT
ANSWER>>>>theft of equipment
____________ is the only EPA SNAP approved "drop in" replacement for
, R-22. - CORRECT ANSWER>>>>There are no direct drop-in refrigerant substitutes
Ester-based oils like POE can be mixed with ________. - CORRECT ANSWER>>>>no other
oils
What provides the cooling in a vapor compression refrigeration system? - CORRECT
ANSWER>>>>The vaporization of the liquid refrigerant
An oil sample might be taken when __________. - CORRECT ANSWER>>>>a. moisture
and/or acid problems are suspected
b. oil sludge formation or oil waxing is suspected
c. residual acidic oil from a burn-out is suspected of contaminating the replacement oil
________ returns refrigerant to new product specifications and requires chemical analysis to
verify the purity to AHRI-700 standards. - CORRECT ANSWER>>>>reclaiming
The EPA considers _________ the most effective for locating the general area of a small leak. -
CORRECT ANSWER>>>>electronic or ultrasonic tester
Low ambient temperatures __________ recovery time. - CORRECT ANSWER>>>>increase
A system is considered dehydrated when _________. - CORRECT ANSWER>>>>a micron
gauge shows you have reached and held a vacuum of 500 microns or less with the vacuum pump
isolated from the system
If corrosion is discovered in the body of a relief valve, the valve must be _______. - CORRECT
ANSWER>>>>replaced
The fill level of a recovery cylinder can be determined by __________. - CORRECT
ANSWER>>>>a. mechanical-float or electronic shut-off devices
b. the weight of the cylinder
Before recharging any flammable hydrocarbon or HFO refrigerant, always ___________. -
CORRECT ANSWER>>>>a. electronically ground the recovery machine and recovery tank,
and verify the refrigeration system is grounded
b. install a fresh filter drier, successfully complete a
standing-pressure leak
A small appliance is defined as a system that is __________. - CORRECT
ANSWER>>>>manufactured, fully charged, and hermetically sealed in a factory with a charge
of 5 pounds or less
__________ is an approved refrigerant for new household refrigerators, freezers, and
combination refrigeration/freezers. - CORRECT ANSWER>>>>R-600a
