Commercial Refrigeration Exam II with comprehensive Questions
and Answers
5%✔️✔️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✔️✔️When converting to POE from mineral oil, what can be used to
determine residual mineral oil content?
Global warming potential (GWP)✔️✔️Some refrigerants are now being phased out due to their
HCFC✔️✔️Which currently used refrigerant category is quickly disappearing due to its ozone
depletion potential?
404a✔️✔️An orange refrigerant container is typically
Ternary blend✔️✔️When three refrigerants make up a new refrigerant it is considered to be a
Temperature glide✔️✔️The difference between bubble point and dew point temperatures is called
HC✔️✔️Which of the following categories of refrigerant is least harmful to the environment?
R-290✔️✔️One of the refrigerants now being used in small refrigerant quantities in self-contained
systems is
400✔️✔️Which "series" of refrigerants should be charged into a system as a liquid?
, The separation of a blended refrigerant in the evaporator or condenser✔️✔️What is fractionation?
POE✔️✔️Which of the following oils may be used with most typical refrigerants used today?
Hygroscopicity✔️✔️The term used to describe the ability to hold moisture is known as
134a✔️✔️A light blue refrigerant container is typically
POE✔️✔️Which oil is shipped in metal containers?
Dew point temperature✔️✔️A 400 series refrigerant should use_______ when calculating
superheat.
In the liquid state, but in a controlled metered condition into the suction side✔️✔️A blend should
be charged
Polyolester (POE)✔️✔️Which of the following lubricants is considered the most hygroscopic used
in stationary refrigeration equipment?
Chlorine✔️✔️The main chemical that harms the ozone layer is
502✔️✔️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✔️✔️When switching from
one refrigerant type to another you should do what?
and Answers
5%✔️✔️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✔️✔️When converting to POE from mineral oil, what can be used to
determine residual mineral oil content?
Global warming potential (GWP)✔️✔️Some refrigerants are now being phased out due to their
HCFC✔️✔️Which currently used refrigerant category is quickly disappearing due to its ozone
depletion potential?
404a✔️✔️An orange refrigerant container is typically
Ternary blend✔️✔️When three refrigerants make up a new refrigerant it is considered to be a
Temperature glide✔️✔️The difference between bubble point and dew point temperatures is called
HC✔️✔️Which of the following categories of refrigerant is least harmful to the environment?
R-290✔️✔️One of the refrigerants now being used in small refrigerant quantities in self-contained
systems is
400✔️✔️Which "series" of refrigerants should be charged into a system as a liquid?
, The separation of a blended refrigerant in the evaporator or condenser✔️✔️What is fractionation?
POE✔️✔️Which of the following oils may be used with most typical refrigerants used today?
Hygroscopicity✔️✔️The term used to describe the ability to hold moisture is known as
134a✔️✔️A light blue refrigerant container is typically
POE✔️✔️Which oil is shipped in metal containers?
Dew point temperature✔️✔️A 400 series refrigerant should use_______ when calculating
superheat.
In the liquid state, but in a controlled metered condition into the suction side✔️✔️A blend should
be charged
Polyolester (POE)✔️✔️Which of the following lubricants is considered the most hygroscopic used
in stationary refrigeration equipment?
Chlorine✔️✔️The main chemical that harms the ozone layer is
502✔️✔️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✔️✔️When switching from
one refrigerant type to another you should do what?
