EPA Core || with Complete Solutions.
Which refrigerant is considered a high-pressure refrigerant? correct answers R-410A
Department of Transportation (DOT) regulations require the ________ to be recorded on the
shipping paper for hazard class 2.2 Nonflammable Compressed Gases. correct answers number
of cylinders of each gas
________ contains chlorine. correct answers R-22
During servicing of any refrigeration system, the refrigerant must be ________. correct answers
recovered
After proper R-410A refrigerant recovery, you should use ________ to leak check the system.
correct answers nitrogen, and if a trace gas is desired, add a small amount of R-410A
The ability of a substance to destroy ozone in the stratosphere is referred to as ________. correct
answers ODP (ozone depletion potential)
Ozone contains ________. correct answers molecules containing 3 oxygen atoms
All CFC, HCFC, and HFC refrigerant recovery devices must ________. correct answers meet
EPA standards
A system is considered dehydrated when ________. correct answers a micron-gauge shows you
have reached and held a vacuum of 500 microns or less with the vacuum pump isolated from the
system
If there is a large release of refrigerant in a contained area ________. correct answers leave the
area, and return with self-contained breathing apparatus
Ester-based oils like POE can be mixed with ________. correct answers no other oils
Never fill a refillable refrigerant cylinder beyond ________. correct answers 80% of its capacity
by weight
When a system using POE oil has been opened, what is the minimum evacuation level that
should be achieved and held before charging the system? correct answers 500 microns
f corrosion is discovered in the body of a relief valve, the valve must be ________. correct
answers replaced
After a refrigerant is phased-out, supplies of that refrigerant for equipment servicing can only
come from ________. correct answers recovered and reclaimed refrigerant
, ________ means that the refrigerant blend has a range of bubble or dew points at a constant
pressure. correct answers Temperature glide
Always ________ when operating refrigerant recovery or recycling equipment. correct answers -
Wear safety glasses
- Wear Protective Gloves
- Follow all safety precautions (for the equipment)
"All of the Above"
The capacity of a vacuum pump and its suction line size affect ________. correct answers
moisture removal and evacuation time
Never operate a hermetic compressor when the system ________. correct answers is evacuated
Which refrigerant release is illegal? correct answers Venting refrigerant from an approved dual-
refrigerant recovery machine to switch working fluids.
Which material is NOT compatible with any HFO refrigerant? correct answers Silicone
The Department of Transportation (DOT) requires ________ when transporting cylinders
containing used refrigerant. correct answers DOT classification tags
When measuring a vacuum of the system, the vacuum gauge should be connected ________.
correct answers to the system as far as possible away from the vacuum pump
How should disposable cylinders be discarded? correct answers Recover all remaining
refrigerant, render the cylinders useless, and recycle the metal.
When a system is operating, the ________ changes a low-pressure vapor to a high-pressure
vapor. correct answers compressor
Which of the following synthetic lubricants is used with ternary refrigerant blends containing
HCFCs? correct answers Alkylbenzene
Non-toxic refrigerants can still cause death because ________. correct answers they are heavier
than air and can cause asphyxia
Under the EPA's new regulations, when can disposable cylinders be used to recover refrigerant?
correct answers Never.
An example of an HCFC refrigerant is: correct answers R-123
A system containing a flammable refrigerant must have the process tubes or service connection
marked with a color marking that extends a minimum of ________ in both directions. correct
answers 1 inch
Which refrigerant is considered a high-pressure refrigerant? correct answers R-410A
Department of Transportation (DOT) regulations require the ________ to be recorded on the
shipping paper for hazard class 2.2 Nonflammable Compressed Gases. correct answers number
of cylinders of each gas
________ contains chlorine. correct answers R-22
During servicing of any refrigeration system, the refrigerant must be ________. correct answers
recovered
After proper R-410A refrigerant recovery, you should use ________ to leak check the system.
correct answers nitrogen, and if a trace gas is desired, add a small amount of R-410A
The ability of a substance to destroy ozone in the stratosphere is referred to as ________. correct
answers ODP (ozone depletion potential)
Ozone contains ________. correct answers molecules containing 3 oxygen atoms
All CFC, HCFC, and HFC refrigerant recovery devices must ________. correct answers meet
EPA standards
A system is considered dehydrated when ________. correct answers a micron-gauge shows you
have reached and held a vacuum of 500 microns or less with the vacuum pump isolated from the
system
If there is a large release of refrigerant in a contained area ________. correct answers leave the
area, and return with self-contained breathing apparatus
Ester-based oils like POE can be mixed with ________. correct answers no other oils
Never fill a refillable refrigerant cylinder beyond ________. correct answers 80% of its capacity
by weight
When a system using POE oil has been opened, what is the minimum evacuation level that
should be achieved and held before charging the system? correct answers 500 microns
f corrosion is discovered in the body of a relief valve, the valve must be ________. correct
answers replaced
After a refrigerant is phased-out, supplies of that refrigerant for equipment servicing can only
come from ________. correct answers recovered and reclaimed refrigerant
, ________ means that the refrigerant blend has a range of bubble or dew points at a constant
pressure. correct answers Temperature glide
Always ________ when operating refrigerant recovery or recycling equipment. correct answers -
Wear safety glasses
- Wear Protective Gloves
- Follow all safety precautions (for the equipment)
"All of the Above"
The capacity of a vacuum pump and its suction line size affect ________. correct answers
moisture removal and evacuation time
Never operate a hermetic compressor when the system ________. correct answers is evacuated
Which refrigerant release is illegal? correct answers Venting refrigerant from an approved dual-
refrigerant recovery machine to switch working fluids.
Which material is NOT compatible with any HFO refrigerant? correct answers Silicone
The Department of Transportation (DOT) requires ________ when transporting cylinders
containing used refrigerant. correct answers DOT classification tags
When measuring a vacuum of the system, the vacuum gauge should be connected ________.
correct answers to the system as far as possible away from the vacuum pump
How should disposable cylinders be discarded? correct answers Recover all remaining
refrigerant, render the cylinders useless, and recycle the metal.
When a system is operating, the ________ changes a low-pressure vapor to a high-pressure
vapor. correct answers compressor
Which of the following synthetic lubricants is used with ternary refrigerant blends containing
HCFCs? correct answers Alkylbenzene
Non-toxic refrigerants can still cause death because ________. correct answers they are heavier
than air and can cause asphyxia
Under the EPA's new regulations, when can disposable cylinders be used to recover refrigerant?
correct answers Never.
An example of an HCFC refrigerant is: correct answers R-123
A system containing a flammable refrigerant must have the process tubes or service connection
marked with a color marking that extends a minimum of ________ in both directions. correct
answers 1 inch
