EPA 608 UNIVERSAL EXAM QUESTIONS
AND
CORRECT DETAILED ANSWERS WITH
RATIONALES GRADED A+
What must be done before disposing of any appliance
containing a CFC, - CORRECT
HCFC, or HFC ANSWER>> refrigerant?Recover the
refrigerant
What must a system owner do once the threshold leak rate has been
exceeded on any low-pressure system using an ozone-depleting refrigerant?
CORRECT ANSWER>>Repair the appliance enough to bring the leak rate
below the threshold, retrofit, or retire the appliance
What may be done to speed the recovery process and ensure that all CFC,
HCFC, or HFC refrigerant has been removed from a frost-free refrigerator?
CORRECT ANSWER>>Turn on the defrost heater to increase the refrigerant's
temperature and vaporize any liquid
What are two factors that, if present, are most likely to
lead to an explosion - CORRECT
with hydrocarbon ANSWER>> refrigerants?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 - CORRECT
verification tests are required?Two. ANSWER>>
Performed before the appliance is recharged
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All appliances must be equipped with a service aperture or process stub
which is used when adding or removing
refrigerant from the appliance. What - CORRECT is typically used
on small appliances?A straight piece ANSWER>>
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? -
CORRECT ANSWER>>Remove non-condensable from the system
Which of the following are recommended safe work
practices when - CORRECT ANSWER>>
recovering refrigerants?Wear safety eyewear and
butyl-lined gloves when connecting/disconnecting hoses
, What is the state of the refrigerant leaving the receiver in a
- CORRECT refrigeration
ANSWER>> system?High pressure liquid
Which of the following repairs would always be
considered - CORRECT "major" under
EPA's ANSWER>> regulations?Replacement of an
evaporator coil
On low-pressure chillers, moisture most frequently enters
the refrigeration - CORRECT
system ANSWER>> through:Leaks from areas with gaskets
or fittings
How would you remove moisture from refrigerant in a system? - CORRECT
ANSWER>>Use a filter drier
Where does refrigerant go after it leaves the purge
unit of a low- - CORRECT pressure
centrifugal ANSWER>> system?The evaporator
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Which refrigerants can be mixed in an appliance? - CORRECT
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? - CORRECT
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 - CORRECT processing it
in any ANSWER>> way?Recovery
What is meant by the term "high efficiency purge unit"? - CORRECT
ANSWER>>Purge units that discharge a low percentage of refrigerant with
the air they remove
Before beginning a refrigerant recovery procedure, it
- CORRECT is ALWAYS necessary to: know the type of refrigerant
ANSWER>> in the system Which of the following gases is used as
the baseline measurement for
global - CORRECT
warming ANSWER>> potential?Carbon Dioxide
Which hydrocarbon refrigerant is approved for retrofit
into existing - CORRECT
household ANSWER>> refrigerators?HC R-600a 2 ounces
or less
Recovered refrigerant may contain which of the following impurities? CORRECT
ANSWER>>Acids, moisture, and oil
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AND
CORRECT DETAILED ANSWERS WITH
RATIONALES GRADED A+
What must be done before disposing of any appliance
containing a CFC, - CORRECT
HCFC, or HFC ANSWER>> refrigerant?Recover the
refrigerant
What must a system owner do once the threshold leak rate has been
exceeded on any low-pressure system using an ozone-depleting refrigerant?
CORRECT ANSWER>>Repair the appliance enough to bring the leak rate
below the threshold, retrofit, or retire the appliance
What may be done to speed the recovery process and ensure that all CFC,
HCFC, or HFC refrigerant has been removed from a frost-free refrigerator?
CORRECT ANSWER>>Turn on the defrost heater to increase the refrigerant's
temperature and vaporize any liquid
What are two factors that, if present, are most likely to
lead to an explosion - CORRECT
with hydrocarbon ANSWER>> refrigerants?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 - CORRECT
verification tests are required?Two. ANSWER>>
Performed before the appliance is recharged
2|Page
All appliances must be equipped with a service aperture or process stub
which is used when adding or removing
refrigerant from the appliance. What - CORRECT is typically used
on small appliances?A straight piece ANSWER>>
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? -
CORRECT ANSWER>>Remove non-condensable from the system
Which of the following are recommended safe work
practices when - CORRECT ANSWER>>
recovering refrigerants?Wear safety eyewear and
butyl-lined gloves when connecting/disconnecting hoses
, What is the state of the refrigerant leaving the receiver in a
- CORRECT refrigeration
ANSWER>> system?High pressure liquid
Which of the following repairs would always be
considered - CORRECT "major" under
EPA's ANSWER>> regulations?Replacement of an
evaporator coil
On low-pressure chillers, moisture most frequently enters
the refrigeration - CORRECT
system ANSWER>> through:Leaks from areas with gaskets
or fittings
How would you remove moisture from refrigerant in a system? - CORRECT
ANSWER>>Use a filter drier
Where does refrigerant go after it leaves the purge
unit of a low- - CORRECT pressure
centrifugal ANSWER>> system?The evaporator
3|Page
Which refrigerants can be mixed in an appliance? - CORRECT
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? - CORRECT
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 - CORRECT processing it
in any ANSWER>> way?Recovery
What is meant by the term "high efficiency purge unit"? - CORRECT
ANSWER>>Purge units that discharge a low percentage of refrigerant with
the air they remove
Before beginning a refrigerant recovery procedure, it
- CORRECT is ALWAYS necessary to: know the type of refrigerant
ANSWER>> in the system Which of the following gases is used as
the baseline measurement for
global - CORRECT
warming ANSWER>> potential?Carbon Dioxide
Which hydrocarbon refrigerant is approved for retrofit
into existing - CORRECT
household ANSWER>> refrigerators?HC R-600a 2 ounces
or less
Recovered refrigerant may contain which of the following impurities? CORRECT
ANSWER>>Acids, moisture, and oil
4|Page
