EPA 608 Universal Exam GUARANTEED PASS!!
What are two factors that, if present, are most likely to lead to an explosion with hydrocarbon
refrigerants? - (ANSWER)A sufficient concentration of the refrigeration in the space and an
ignition source
An appliance normally containing more than 50 pounds of R-22 refrigerant was found to have a
35% annual leak rate. After the repair, how many successful verification tests are required? -
(ANSWER)Two. Performed before the appliance is recharged
All appliances must be equipped with a service aperture or process stub which is used when
adding or removing refrigerant from the appliance. What is typically used on small appliances? -
(ANSWER)A straight piece of tubing that is entered using a piercing access valve. Process Tube
What is the primary purpose of a purge unit on a low-pressure chiller? - (ANSWER)Remove
non-condensable from the system
Which of the following are recommended safe work practices when recovering refrigerants? -
(ANSWER)Wear safety eyewear and butyl-lined gloves when connecting/disconnecting hoses
What is the state of the refrigerant leaving the receiver in a refrigeration system? -
(ANSWER)High pressure liquid
Which of the following repairs would always be considered "major" under EPA's regulations? -
(ANSWER)Replacement of an evaporator coil
On low-pressure chillers, moisture most frequently enters the refrigeration system through: -
(ANSWER)Leaks from areas with gaskets or fittings
How would you remove moisture from refrigerant in a system? - (ANSWER)Use a filter drier
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, Where does refrigerant go after it leaves the purge unit of a low-pressure centrifugal system? -
(ANSWER)The evaporator
Which refrigerants can be mixed in an appliance? - (ANSWER)Refrigerants cannot be mixed
What gas should be used to leak check a system designed for use with R-410A that has been
opened for a major system repair? - (ANSWER)Pressurized nitrogen
What is the term for removing refrigerant in any condition from a system and storing it in an
external container without necessarily testing or processing it in any way? -
(ANSWER)Recovery
What is meant by the term "high efficiency purge unit"? - (ANSWER)Purge units that discharge
a low percentage of refrigerant with the air they remove
Before beginning a refrigerant recovery procedure, it is ALWAYS necessary to: -
(ANSWER)know the type of refrigerant in the system
Which of the following gases is used as the baseline measurement for global warming potential?
- (ANSWER)Carbon Dioxide
Which hydrocarbon refrigerant is approved for retrofit into existing household refrigerators? -
(ANSWER)HC R-600a 2 ounces or less
Recovered refrigerant may contain which of the following impurities? - (ANSWER)Acids,
moisture, and oil
A hydrostatic tube test kit will - (ANSWER)determine if a lube leaks
When installing any type of access fitting onto a sealed system: - (ANSWER)the fitting should
be leak tested before proceeding with recovery
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What are two factors that, if present, are most likely to lead to an explosion with hydrocarbon
refrigerants? - (ANSWER)A sufficient concentration of the refrigeration in the space and an
ignition source
An appliance normally containing more than 50 pounds of R-22 refrigerant was found to have a
35% annual leak rate. After the repair, how many successful verification tests are required? -
(ANSWER)Two. Performed before the appliance is recharged
All appliances must be equipped with a service aperture or process stub which is used when
adding or removing refrigerant from the appliance. What is typically used on small appliances? -
(ANSWER)A straight piece of tubing that is entered using a piercing access valve. Process Tube
What is the primary purpose of a purge unit on a low-pressure chiller? - (ANSWER)Remove
non-condensable from the system
Which of the following are recommended safe work practices when recovering refrigerants? -
(ANSWER)Wear safety eyewear and butyl-lined gloves when connecting/disconnecting hoses
What is the state of the refrigerant leaving the receiver in a refrigeration system? -
(ANSWER)High pressure liquid
Which of the following repairs would always be considered "major" under EPA's regulations? -
(ANSWER)Replacement of an evaporator coil
On low-pressure chillers, moisture most frequently enters the refrigeration system through: -
(ANSWER)Leaks from areas with gaskets or fittings
How would you remove moisture from refrigerant in a system? - (ANSWER)Use a filter drier
Page 1 of 10
, Where does refrigerant go after it leaves the purge unit of a low-pressure centrifugal system? -
(ANSWER)The evaporator
Which refrigerants can be mixed in an appliance? - (ANSWER)Refrigerants cannot be mixed
What gas should be used to leak check a system designed for use with R-410A that has been
opened for a major system repair? - (ANSWER)Pressurized nitrogen
What is the term for removing refrigerant in any condition from a system and storing it in an
external container without necessarily testing or processing it in any way? -
(ANSWER)Recovery
What is meant by the term "high efficiency purge unit"? - (ANSWER)Purge units that discharge
a low percentage of refrigerant with the air they remove
Before beginning a refrigerant recovery procedure, it is ALWAYS necessary to: -
(ANSWER)know the type of refrigerant in the system
Which of the following gases is used as the baseline measurement for global warming potential?
- (ANSWER)Carbon Dioxide
Which hydrocarbon refrigerant is approved for retrofit into existing household refrigerators? -
(ANSWER)HC R-600a 2 ounces or less
Recovered refrigerant may contain which of the following impurities? - (ANSWER)Acids,
moisture, and oil
A hydrostatic tube test kit will - (ANSWER)determine if a lube leaks
When installing any type of access fitting onto a sealed system: - (ANSWER)the fitting should
be leak tested before proceeding with recovery
Page 2 of 10
