A2L-Core pt3 Introduction to
Refrigerating Test Questions with All
Actual Answers 2026.
.Which of the following refrigerants has the lowest global warming potential? - Answer R-600
How does the global warming potential of R-410A compare to carbon dioxide? - Answer
They are equal.
How do the global warming potentials of isobutane (R-600a), propane (R-290), and R-441A
compare to the GWPs of HFC-134a, R-404A, and R-410A? - Answer They are significantly
lower
What is the state of the refrigerant entering the compressor of a refrigeration system? - Answer
Low pressure vapor
Which type of lubricants are HFO refrigerants are miscible in? - Answer POE lubricants
What characteristic(s) of CFCs and HCFCs make them more likely to reach the stratosphere than
most other compounds containing chlorine? - Answer They do not dissolve in water or easily
break down in the atmosphere
What does ozone depletion potential (or'ODP) measure? - Answer The ability of a substance
to destroy ozone in the stratosphere.
What characteristic of HFC refrigerants make them damaging to the environment? - Answer
They can have very high global warming potentials.
Which of the following refrigerants contains chlorine? - Answer R-22
When working with an appliance containing HCFCs or HFCs, which of the following does NOT
require a person to be a Section 608 certified technician? - Answer Rewiring an external
electric circuit.
Which of the following is not a reason to recover refrigerants? - Answer Avoid violating the
warranty on equipment.
,A major system repai is being performed on an R-22 appliance. What CANNOT be done to
recharge the appliance? - Answer Top off the unit with R-410A.
In which of the following scenarios can refrigerant be vented? - Answer Releasing isobutane
from a household freezer.
What range is displayed on a high pressure gauge on a service manifold? - Answer 0 to 800
psi
Why do EPA regulationg require appliances to have a service aperture or process stub? - Answer
To make it easier to recover refrigerant.
Which of the following releases of a refrigerant is illegal? - Answer Venting refrigerant from a
recovery machine or recovery cylinder.
Which types of refrigerant can only be sold to persons who have successfully passed the EPA's
Section 608 certification exam? - Answer All refrigerants that are not exempt from the
venting prohibition.
What is the center port on a three port manifold used for? - Answer Recovery, evacuation,
and charging.
What is the term for removing refrigerant in any condition from a system and storing it in an
external container without necessarily testing or processing it in any way? - Answer
Recovering
You have to leak-check a unit which has lost a complete charge. Which gas(es) would cause the
LEAST damage to the environment? - Answer Dry nitrogen
What effect will low ambient temperatures have on recovery - Answer Increase the recovery
time.
Which of the following is a reason to heat a system during dehydration? - Answer To
decrease dehydration time
When pressurizing a refrigeration system with nitrogen what rule should you always follow? -
Answer Use a pressure regulator with a pressure relief valve on the nitrogen cylinder.
Under what conditions may you use a disposable cylinder to recover rerigerant? - Answer
Never
, What must be done before shipping any used refrigerant in a cylinder? - Answer Properly
label the refrigerant container.
Which of the following refrigerant has a GWP of "1"?
A) R-22
B) R-1233zd
C) R-410A
D) R-134a - Answer B) R-1233zd
The molecule found in CFCs and HCFCs that depletes O-Zone is:
A) Fluorine
B) Chlorine
C) Hydrogen
D) Carbon - Answer B) Chlorine
Recover any remaining refrigerant and then render the cylinder useless, then recycle the metal
is the proper disposal method for;
A) disposable cylinders
B) recovery cylinders
C) one pound cans
D) accumulator cylinders - Answer A) disposable cylinders
The condenser __________________________.
A) Changes a high-pressure vapor to a high-pressure liquid.
B) Changes a low pressure liquid to a low pressure vapor.
C) changes a low-pressure vapor to a low-pressure liquid.
D) changes a high-pressure liquid to a low-pressure liquid. - Answer A) Changes a high-
pressure vapor to a high-pressure liquid.
An ozone molecule contains;
A) Four oxygen atoms
Refrigerating Test Questions with All
Actual Answers 2026.
.Which of the following refrigerants has the lowest global warming potential? - Answer R-600
How does the global warming potential of R-410A compare to carbon dioxide? - Answer
They are equal.
How do the global warming potentials of isobutane (R-600a), propane (R-290), and R-441A
compare to the GWPs of HFC-134a, R-404A, and R-410A? - Answer They are significantly
lower
What is the state of the refrigerant entering the compressor of a refrigeration system? - Answer
Low pressure vapor
Which type of lubricants are HFO refrigerants are miscible in? - Answer POE lubricants
What characteristic(s) of CFCs and HCFCs make them more likely to reach the stratosphere than
most other compounds containing chlorine? - Answer They do not dissolve in water or easily
break down in the atmosphere
What does ozone depletion potential (or'ODP) measure? - Answer The ability of a substance
to destroy ozone in the stratosphere.
What characteristic of HFC refrigerants make them damaging to the environment? - Answer
They can have very high global warming potentials.
Which of the following refrigerants contains chlorine? - Answer R-22
When working with an appliance containing HCFCs or HFCs, which of the following does NOT
require a person to be a Section 608 certified technician? - Answer Rewiring an external
electric circuit.
Which of the following is not a reason to recover refrigerants? - Answer Avoid violating the
warranty on equipment.
,A major system repai is being performed on an R-22 appliance. What CANNOT be done to
recharge the appliance? - Answer Top off the unit with R-410A.
In which of the following scenarios can refrigerant be vented? - Answer Releasing isobutane
from a household freezer.
What range is displayed on a high pressure gauge on a service manifold? - Answer 0 to 800
psi
Why do EPA regulationg require appliances to have a service aperture or process stub? - Answer
To make it easier to recover refrigerant.
Which of the following releases of a refrigerant is illegal? - Answer Venting refrigerant from a
recovery machine or recovery cylinder.
Which types of refrigerant can only be sold to persons who have successfully passed the EPA's
Section 608 certification exam? - Answer All refrigerants that are not exempt from the
venting prohibition.
What is the center port on a three port manifold used for? - Answer Recovery, evacuation,
and charging.
What is the term for removing refrigerant in any condition from a system and storing it in an
external container without necessarily testing or processing it in any way? - Answer
Recovering
You have to leak-check a unit which has lost a complete charge. Which gas(es) would cause the
LEAST damage to the environment? - Answer Dry nitrogen
What effect will low ambient temperatures have on recovery - Answer Increase the recovery
time.
Which of the following is a reason to heat a system during dehydration? - Answer To
decrease dehydration time
When pressurizing a refrigeration system with nitrogen what rule should you always follow? -
Answer Use a pressure regulator with a pressure relief valve on the nitrogen cylinder.
Under what conditions may you use a disposable cylinder to recover rerigerant? - Answer
Never
, What must be done before shipping any used refrigerant in a cylinder? - Answer Properly
label the refrigerant container.
Which of the following refrigerant has a GWP of "1"?
A) R-22
B) R-1233zd
C) R-410A
D) R-134a - Answer B) R-1233zd
The molecule found in CFCs and HCFCs that depletes O-Zone is:
A) Fluorine
B) Chlorine
C) Hydrogen
D) Carbon - Answer B) Chlorine
Recover any remaining refrigerant and then render the cylinder useless, then recycle the metal
is the proper disposal method for;
A) disposable cylinders
B) recovery cylinders
C) one pound cans
D) accumulator cylinders - Answer A) disposable cylinders
The condenser __________________________.
A) Changes a high-pressure vapor to a high-pressure liquid.
B) Changes a low pressure liquid to a low pressure vapor.
C) changes a low-pressure vapor to a low-pressure liquid.
D) changes a high-pressure liquid to a low-pressure liquid. - Answer A) Changes a high-
pressure vapor to a high-pressure liquid.
An ozone molecule contains;
A) Four oxygen atoms
