EPA 608 Certification questions and
answers graded A+
Which of the following factors affect the speed of system dehydration - correct answer ✔✔The
ambient temperature and amount of moisture in the system
What is the state of the refrigerant leaving the receiver in a refrigeration system? - correct
answer ✔✔high pressure liquid
When evacuating the system the use of a large vacuum pump could - correct answer ✔✔cause
trapped water to freeze
What are two factors that, if present, are most likely to lead to an explosion with hydrocarbon
refrigerant? - correct answer ✔✔A sufficient concentration of the refrigerant in the space and
an ignition source
What is the service procedure if the refrigerant in a recovery cylinder is suspected to be
contaminated - correct answer ✔✔Take a pressure reading of the cylinder
What is the best use for testing with soap bubbles? - correct answer ✔✔To pinpoint refrigerant
leaks
What is the component directly following the condenser in a refrigeration system using the
terms expansion valve? - correct answer ✔✔Receiver
HFC's - correct answer ✔✔Will not damage the stratospheric ozone but have a high GWP
,Which of the following refrigerants of an HFO? - correct answer ✔✔R-1234ze
Which of the following refrigerant has a GWP OF 1? - correct answer ✔✔carbon dioxide
Which of the following has the highest ozone depletion potential? - correct answer ✔✔CFC's
The low side test pressure data plate valve should be used by a technician to determine a safe
pressure for - correct answer ✔✔Leak testing
Silicone elastomers, for use in seals and gaskets, are not compatible with which refrigerants? -
correct answer ✔✔HFO's
To process refrigerant to a level equal to new (virgin) product specifications as determined by
chemical analysis defines - correct answer ✔✔Reclaiming
Crop loss, eye disease, and skin cancer have been attributed to; - correct answer ✔✔Depletion
of Stratospheric ozone
an oxygen molecule contains - correct answer ✔✔Three oxygen atoms
Which type of refrigerant contains no chlorine? - correct answer ✔✔HFCs
Disposable refrigerant containers are used for _______ refrigerant. - correct answer ✔✔virgin
Which refrigerant is an HCFC - correct answer ✔✔R-124
In general, blended refrigerants should be charged as - correct answer ✔✔A liquid
, The Montreal protocol is - correct answer ✔✔a treaty among nations that controls production
of CFCs and HCFCs
Of the refrigerants listed bellow, which has the lowest ozone depletion potential - correct
answer ✔✔R-22
Ozone Depletion Potential - correct answer ✔✔Measures the ability of CFC and HCFCS to
destroy and ozone
An example of a HFC refrigerant is - correct answer ✔✔R-134a
The evacuation of a system is a method of - correct answer ✔✔dehydration
What is the best proof the CFC's are in the stratosphere - correct answer ✔✔Measurement of
CFCs in air samples from the stratosphere
A compound pressure gauge, typically used on the low side of the system, measures pressure
in: - correct answer ✔✔psig and inches of mercury
What is the process that returns refrigerant to new-product specifications and that requires
chemical analysis - correct answer ✔✔to reclaim
Which type of refrigerant is the most harmful to stratospheric ozone? - correct answer
✔✔Bromine
A hermetic compressor must never be operated when: - correct answer ✔✔there is a
dehydration vacuum in the system
answers graded A+
Which of the following factors affect the speed of system dehydration - correct answer ✔✔The
ambient temperature and amount of moisture in the system
What is the state of the refrigerant leaving the receiver in a refrigeration system? - correct
answer ✔✔high pressure liquid
When evacuating the system the use of a large vacuum pump could - correct answer ✔✔cause
trapped water to freeze
What are two factors that, if present, are most likely to lead to an explosion with hydrocarbon
refrigerant? - correct answer ✔✔A sufficient concentration of the refrigerant in the space and
an ignition source
What is the service procedure if the refrigerant in a recovery cylinder is suspected to be
contaminated - correct answer ✔✔Take a pressure reading of the cylinder
What is the best use for testing with soap bubbles? - correct answer ✔✔To pinpoint refrigerant
leaks
What is the component directly following the condenser in a refrigeration system using the
terms expansion valve? - correct answer ✔✔Receiver
HFC's - correct answer ✔✔Will not damage the stratospheric ozone but have a high GWP
,Which of the following refrigerants of an HFO? - correct answer ✔✔R-1234ze
Which of the following refrigerant has a GWP OF 1? - correct answer ✔✔carbon dioxide
Which of the following has the highest ozone depletion potential? - correct answer ✔✔CFC's
The low side test pressure data plate valve should be used by a technician to determine a safe
pressure for - correct answer ✔✔Leak testing
Silicone elastomers, for use in seals and gaskets, are not compatible with which refrigerants? -
correct answer ✔✔HFO's
To process refrigerant to a level equal to new (virgin) product specifications as determined by
chemical analysis defines - correct answer ✔✔Reclaiming
Crop loss, eye disease, and skin cancer have been attributed to; - correct answer ✔✔Depletion
of Stratospheric ozone
an oxygen molecule contains - correct answer ✔✔Three oxygen atoms
Which type of refrigerant contains no chlorine? - correct answer ✔✔HFCs
Disposable refrigerant containers are used for _______ refrigerant. - correct answer ✔✔virgin
Which refrigerant is an HCFC - correct answer ✔✔R-124
In general, blended refrigerants should be charged as - correct answer ✔✔A liquid
, The Montreal protocol is - correct answer ✔✔a treaty among nations that controls production
of CFCs and HCFCs
Of the refrigerants listed bellow, which has the lowest ozone depletion potential - correct
answer ✔✔R-22
Ozone Depletion Potential - correct answer ✔✔Measures the ability of CFC and HCFCS to
destroy and ozone
An example of a HFC refrigerant is - correct answer ✔✔R-134a
The evacuation of a system is a method of - correct answer ✔✔dehydration
What is the best proof the CFC's are in the stratosphere - correct answer ✔✔Measurement of
CFCs in air samples from the stratosphere
A compound pressure gauge, typically used on the low side of the system, measures pressure
in: - correct answer ✔✔psig and inches of mercury
What is the process that returns refrigerant to new-product specifications and that requires
chemical analysis - correct answer ✔✔to reclaim
Which type of refrigerant is the most harmful to stratospheric ozone? - correct answer
✔✔Bromine
A hermetic compressor must never be operated when: - correct answer ✔✔there is a
dehydration vacuum in the system
