EPA 608 EXAM REVISION QUESTIONS
AND THEIR EXPECTED ANSWERS
What type of refrigerant is chlorine free?
HFC's
Refrigerant migrates to the compressor crankcase
because of a difference in ________ between the
refrigerant and the oil
Vapor pressure
Which Refrigerant is an HCFC? A) R-124, B) R-134A,
C) R410a, D) R-12, E) R-22
E) R- 22
Which Refrigerant is an HFC? A) R-124, B) R-134A, C)
R410a, D) R-12, E) Both B and C
E) Both B and C
What factor(s) affects the speed of evacuation? A) the
size of the equipment being evacuated, B) the ambient
temperature, C) the amt of moisture in the system, D)
All of the above
D) All of the above
Systems charged with R-134a should be leak checked
with:
Pressurized dry nitrogen
HCFC refrigerants contain:
Hydrogen, chlorine, fluorine, carbon
Manifold gauge sets are often color coded, when this
is done, the low pressure gauge is color coded:
Blue
,After refrigerant liquid transfer between recovery unit
and the system being emptied, you need to avoid
trapping:
Liquid refrigerant between service valves
When can you use a disposable cylinder to recover
refrigerant?
Never
CFC refrigerants are so named because they contain
the elements:
Chlorine, fluorine, carbon
Recovery equipment that relies upon the compressor
in the system would be considered:
System-dependant
The EPA requires the installation of a service aperture
stub on all appliances using a class I or class II
sustance as a refrigerant. The main purpose of this
requirement is to make it easier to:
Recover refrigerant
When dealing with small systems, how many different
refrigerants may be recovered in the same cylinder?
Only one
It is important not to mix different refrigerants in the
same container because:
The mixture may be impossible to reclaim
Chlorofluorocarbons (CFC's) and
hydrochlorofluorocarbons (HCFC's) have which of the
following in common?
They must be recovered before opening or disposing of
appliances
Refrigerant that is recovered can be returned to:
,The same system or other systems owned by the same
person without restrictions
An example of a HFC refrigerant is:
R-134a
When transporting cylinders containing used
refrigerant, the DOT requires that you:
Attach DOT classification tags
Blended refrigerants leak from a system:
In uneven amounts due to different vapor pressures
Which type of refrigerant is the most harmful to
stratospheric ozone?
CFC
Long hoses between the unit and the recovery
machine should not be used because they cause: A)
Excessive pressure drop, B) Increased recovery time,
C) Increased emissions, D) All of the above
D) All of the above
If corrosion is found within the body of a relief valve,
the valve must be:
Replaced
Disposable refrigerant containers are used for ______
refrigerant.
Virgin
Never use an open flame to heat a refrigerant tank
because: A) it can result in venting refrigerant to the
atmosphere, B) the tank may explode, causing serious
injury to people nearby, C) refrigerant in the tank may
decompose, forming a toxic material, D) All of the
above
D) All of the above
If an oil is hygroscopic it means that it:
, Readily absorbs moisture
The type of oil that is most commonly used in
stationary refrigeration applications w/ HFC-134a
refrigerant is:
Ester oil
Which type of refrigerant is the most harmful to
stratospheric ozone?
Refrigerants containing bromine
Ozone depletion in the Stratosphere is what type of
problem?
Global
Under EPA's regulations, what standard must
reclaimed refrigerant meet before it can be resold?
ARI 700
Under the EPA's " safe disposal requirements ", who
is responsible of making sure that the refrigerant is
removed from household refrigerators before they are
disposed of:
Final person in the disposal chain
Ozone depletion potential, or "ODP," is:
A measure of the ability of CFCs' and HCFCs' to destroy
ozone
_______ is the process of removing refrigerant in any
condition from a system and storing it in a container
without necessarily testing or processing it in any
way.
Recovering
The EPA can require a technician to demonstrate their
ability to perform proper procedures for recovering
and/or recycling refrigerant. Failure to demonstrate
competency can result in:
AND THEIR EXPECTED ANSWERS
What type of refrigerant is chlorine free?
HFC's
Refrigerant migrates to the compressor crankcase
because of a difference in ________ between the
refrigerant and the oil
Vapor pressure
Which Refrigerant is an HCFC? A) R-124, B) R-134A,
C) R410a, D) R-12, E) R-22
E) R- 22
Which Refrigerant is an HFC? A) R-124, B) R-134A, C)
R410a, D) R-12, E) Both B and C
E) Both B and C
What factor(s) affects the speed of evacuation? A) the
size of the equipment being evacuated, B) the ambient
temperature, C) the amt of moisture in the system, D)
All of the above
D) All of the above
Systems charged with R-134a should be leak checked
with:
Pressurized dry nitrogen
HCFC refrigerants contain:
Hydrogen, chlorine, fluorine, carbon
Manifold gauge sets are often color coded, when this
is done, the low pressure gauge is color coded:
Blue
,After refrigerant liquid transfer between recovery unit
and the system being emptied, you need to avoid
trapping:
Liquid refrigerant between service valves
When can you use a disposable cylinder to recover
refrigerant?
Never
CFC refrigerants are so named because they contain
the elements:
Chlorine, fluorine, carbon
Recovery equipment that relies upon the compressor
in the system would be considered:
System-dependant
The EPA requires the installation of a service aperture
stub on all appliances using a class I or class II
sustance as a refrigerant. The main purpose of this
requirement is to make it easier to:
Recover refrigerant
When dealing with small systems, how many different
refrigerants may be recovered in the same cylinder?
Only one
It is important not to mix different refrigerants in the
same container because:
The mixture may be impossible to reclaim
Chlorofluorocarbons (CFC's) and
hydrochlorofluorocarbons (HCFC's) have which of the
following in common?
They must be recovered before opening or disposing of
appliances
Refrigerant that is recovered can be returned to:
,The same system or other systems owned by the same
person without restrictions
An example of a HFC refrigerant is:
R-134a
When transporting cylinders containing used
refrigerant, the DOT requires that you:
Attach DOT classification tags
Blended refrigerants leak from a system:
In uneven amounts due to different vapor pressures
Which type of refrigerant is the most harmful to
stratospheric ozone?
CFC
Long hoses between the unit and the recovery
machine should not be used because they cause: A)
Excessive pressure drop, B) Increased recovery time,
C) Increased emissions, D) All of the above
D) All of the above
If corrosion is found within the body of a relief valve,
the valve must be:
Replaced
Disposable refrigerant containers are used for ______
refrigerant.
Virgin
Never use an open flame to heat a refrigerant tank
because: A) it can result in venting refrigerant to the
atmosphere, B) the tank may explode, causing serious
injury to people nearby, C) refrigerant in the tank may
decompose, forming a toxic material, D) All of the
above
D) All of the above
If an oil is hygroscopic it means that it:
, Readily absorbs moisture
The type of oil that is most commonly used in
stationary refrigeration applications w/ HFC-134a
refrigerant is:
Ester oil
Which type of refrigerant is the most harmful to
stratospheric ozone?
Refrigerants containing bromine
Ozone depletion in the Stratosphere is what type of
problem?
Global
Under EPA's regulations, what standard must
reclaimed refrigerant meet before it can be resold?
ARI 700
Under the EPA's " safe disposal requirements ", who
is responsible of making sure that the refrigerant is
removed from household refrigerators before they are
disposed of:
Final person in the disposal chain
Ozone depletion potential, or "ODP," is:
A measure of the ability of CFCs' and HCFCs' to destroy
ozone
_______ is the process of removing refrigerant in any
condition from a system and storing it in a container
without necessarily testing or processing it in any
way.
Recovering
The EPA can require a technician to demonstrate their
ability to perform proper procedures for recovering
and/or recycling refrigerant. Failure to demonstrate
competency can result in:
