Commercial Refrigeration Exam II –
Questions and 100% Correct Answers
(2025/2026)
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?
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?
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?
Questions and 100% Correct Answers
(2025/2026)
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?
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?
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?
