Refrigeration Operating Engineer
License Exam Practice Test
Questions (2026 Update) with Correct
Verified And Well Analyzed Answers
Graded A+
Oil pressure switch
protects the compressor from operating too long with no or partial
lubrication.
Off cycle defrost
Used on medium temperature systems for defrost by the air in the
cooler which will be above 32°.
Filter dryer
Removes dirt and moisture out of the refrigerator.
Suction accumulator
Prevents liquid refrigerant from entering the compressor.
Receiver
Stores unused refrigerant in a system that uses a metering device
that varies the refrigerant flow with the load.
Two types of defrost used with low temperature fixtures are _____
and _____.
Hot gas and electric
, You must evacuate and punch a hole in a DOT-39 container before
disposing of it.
True
By Code, a licensed Refrigeration Operating Engineer cannot break
into a freon system in the City of Seattle.
True
High temperature refrigeration is between ___ and ___.
45 degrees F and 60 degrees F
Low temperature refrigeration is between ___ and ___.
-20 degrees F and 5 degrees F
Medium temperature refrigeration is between ___ and ___.
30 degrees F and 45 degrees F
The average coil to air temperature relationship of the evaporators is
___.
15 degrees F differences leaving air and boiling refrigerant
temperature.
HCFCs are Hydrochlorofluorocarbins and contain the elements ___.
Hydrogen, chlorine, fluorine.
HFCs are Hydrofluorocarbons’ and contain the elements ___.
Hydrogen, fluorine and carbon.
Ozone Depletion Potential
A measurement of CFCs and HCFCs ability to destroy ozone.
White colored cylinder is used for ___.
R-12 refrigerant
Silver colored cylinder is used for ___.
R-717 refrigerant
On a gauge manifold the red hose is to be connected to the ___.
License Exam Practice Test
Questions (2026 Update) with Correct
Verified And Well Analyzed Answers
Graded A+
Oil pressure switch
protects the compressor from operating too long with no or partial
lubrication.
Off cycle defrost
Used on medium temperature systems for defrost by the air in the
cooler which will be above 32°.
Filter dryer
Removes dirt and moisture out of the refrigerator.
Suction accumulator
Prevents liquid refrigerant from entering the compressor.
Receiver
Stores unused refrigerant in a system that uses a metering device
that varies the refrigerant flow with the load.
Two types of defrost used with low temperature fixtures are _____
and _____.
Hot gas and electric
, You must evacuate and punch a hole in a DOT-39 container before
disposing of it.
True
By Code, a licensed Refrigeration Operating Engineer cannot break
into a freon system in the City of Seattle.
True
High temperature refrigeration is between ___ and ___.
45 degrees F and 60 degrees F
Low temperature refrigeration is between ___ and ___.
-20 degrees F and 5 degrees F
Medium temperature refrigeration is between ___ and ___.
30 degrees F and 45 degrees F
The average coil to air temperature relationship of the evaporators is
___.
15 degrees F differences leaving air and boiling refrigerant
temperature.
HCFCs are Hydrochlorofluorocarbins and contain the elements ___.
Hydrogen, chlorine, fluorine.
HFCs are Hydrofluorocarbons’ and contain the elements ___.
Hydrogen, fluorine and carbon.
Ozone Depletion Potential
A measurement of CFCs and HCFCs ability to destroy ozone.
White colored cylinder is used for ___.
R-12 refrigerant
Silver colored cylinder is used for ___.
R-717 refrigerant
On a gauge manifold the red hose is to be connected to the ___.
