Commercial Refrigeration Exam II
Questions with Latest Update
5% - Answer-If converting from mineral oil to POE oil, what is considered to be the
industry standard for residual mineral oil content?
Refractometer
Oil conversion test kit - Answer-When converting to POE from mineral oil, what can be
used to determine residual mineral oil content?
Global warming potential (GWP) - Answer-Some refrigerants are now being phased out
due to their
HCFC - Answer-Which currently used refrigerant category is quickly disappearing due
to its ozone depletion potential?
404a - Answer-An orange refrigerant container is typically
Ternary blend - Answer-When three refrigerants make up a new refrigerant it is
considered to be a
Temperature glide - Answer-The difference between bubble point and dew point
temperatures is called
HC - Answer-Which of the following categories of refrigerant is least harmful to the
environment?
R-290 - Answer-One of the refrigerants now being used in small refrigerant quantities in
self-contained systems is
400 - Answer-Which "series" of refrigerants should be charged into a system as a
liquid?
The separation of a blended refrigerant in the evaporator or condenser - Answer-What
is fractionation?
POE - Answer-Which of the following oils may be used with most typical refrigerants
used today?
Hygroscopicity - Answer-The term used to describe the ability to hold moisture is known
as
134a - Answer-A light blue refrigerant container is typically
, POE - Answer-Which oil is shipped in metal containers?
Dew point temperature - Answer-A 400 series refrigerant should use_______ when
calculating superheat.
In the liquid state, but in a controlled metered condition into the suction side - Answer-A
blend should be charged
Polyolester (POE) - Answer-Which of the following lubricants is considered the most
hygroscopic used in stationary refrigeration equipment?
Chlorine - Answer-The main chemical that harms the ozone layer is
502 - Answer-What refrigerant was mainly used in low temp refrigeration before HFC
404a was created?
Perform a pump out procedure as per the unit's operating instructions - Answer-When
switching from one refrigerant type to another you should do what?
True - Answer-A working system may result in a quicker recovery rate by allowing it to
operate and purge liquid directly into the recovery cylinder.
More than 80% full - Answer-A recovery cylinder should never be filled
Recovery - Answer-The removal of refrigerant in any state from a system is called
42 pounds - Answer-Which of the following would be a correctly filled "30 pound"
recovery cylinder if it weighs 18 pounds when empty?
As long as it meets AHRI standard 700 - Answer-Refrigerant can be resold to a new
owner if it is
100% of total charge - Answer-How much can a refrigeration system containing 18
pounds of refrigerant legally leak annually according to EPA rules?
There is no limitation to putting refrigerant back into the same system as long as it is not
contaminated - Answer-Recovered refrigerant cannot be placed back into the system it
has been recovered from unless
Condition of recovered refrigerant - Answer-To determine the full weight of a recovery
cylinder, which of the following IS NOT required to be known
False - Answer-It is still necessary to recover the entire refrigerant when a section of the
system can be isolated with service valves
Questions with Latest Update
5% - Answer-If converting from mineral oil to POE oil, what is considered to be the
industry standard for residual mineral oil content?
Refractometer
Oil conversion test kit - Answer-When converting to POE from mineral oil, what can be
used to determine residual mineral oil content?
Global warming potential (GWP) - Answer-Some refrigerants are now being phased out
due to their
HCFC - Answer-Which currently used refrigerant category is quickly disappearing due
to its ozone depletion potential?
404a - Answer-An orange refrigerant container is typically
Ternary blend - Answer-When three refrigerants make up a new refrigerant it is
considered to be a
Temperature glide - Answer-The difference between bubble point and dew point
temperatures is called
HC - Answer-Which of the following categories of refrigerant is least harmful to the
environment?
R-290 - Answer-One of the refrigerants now being used in small refrigerant quantities in
self-contained systems is
400 - Answer-Which "series" of refrigerants should be charged into a system as a
liquid?
The separation of a blended refrigerant in the evaporator or condenser - Answer-What
is fractionation?
POE - Answer-Which of the following oils may be used with most typical refrigerants
used today?
Hygroscopicity - Answer-The term used to describe the ability to hold moisture is known
as
134a - Answer-A light blue refrigerant container is typically
, POE - Answer-Which oil is shipped in metal containers?
Dew point temperature - Answer-A 400 series refrigerant should use_______ when
calculating superheat.
In the liquid state, but in a controlled metered condition into the suction side - Answer-A
blend should be charged
Polyolester (POE) - Answer-Which of the following lubricants is considered the most
hygroscopic used in stationary refrigeration equipment?
Chlorine - Answer-The main chemical that harms the ozone layer is
502 - Answer-What refrigerant was mainly used in low temp refrigeration before HFC
404a was created?
Perform a pump out procedure as per the unit's operating instructions - Answer-When
switching from one refrigerant type to another you should do what?
True - Answer-A working system may result in a quicker recovery rate by allowing it to
operate and purge liquid directly into the recovery cylinder.
More than 80% full - Answer-A recovery cylinder should never be filled
Recovery - Answer-The removal of refrigerant in any state from a system is called
42 pounds - Answer-Which of the following would be a correctly filled "30 pound"
recovery cylinder if it weighs 18 pounds when empty?
As long as it meets AHRI standard 700 - Answer-Refrigerant can be resold to a new
owner if it is
100% of total charge - Answer-How much can a refrigeration system containing 18
pounds of refrigerant legally leak annually according to EPA rules?
There is no limitation to putting refrigerant back into the same system as long as it is not
contaminated - Answer-Recovered refrigerant cannot be placed back into the system it
has been recovered from unless
Condition of recovered refrigerant - Answer-To determine the full weight of a recovery
cylinder, which of the following IS NOT required to be known
False - Answer-It is still necessary to recover the entire refrigerant when a section of the
system can be isolated with service valves
