A2L PRACTICE TEST QUESTIONS WITH ACCURATE
ANSWERS
________ of a combustible gas is the rate at which a flame front spreads relative
to the unburned gas ahead of the flame. correct answer Burning velocity
_________ is equal to 760,000 microns. correct answer Atmospheric Pressure (0
psig)
__________ can form when any flouride-containing refrigerant, even non-
flammable A1 refrigerants, undergoes complete or incomplete combustion, or
thermal decomposition. correct answer Hydrogen Fluoride (HF)
__________ requires that if flammable refrigerant cylinders are to be stored in an
enclosure, the enclosure be secure and ventilated correct answer OSHA.
___________ is a measurement of the amount of heat released when a
substance, in this case, a refrigerant, burns. correct answer Heat of Combustion
(HOC)
___________ is the process of removing air and other non-condensables from the
system. correct answer Degassing
____________ are used to determine the maximum concentration of a
refrigerant allowed in an occupied space correct answer Refrigerant
Concentration Limits (RCL).
, _____________ are highly flammable and require additional technician training
for safe use. correct answer Hydrocarbon refrigerants
_______________ of a refrigerant is the minimum concentration of a refrigerant
that can propagate a flame through a consistent mixture of the refrigerant and air
under specified test conditions. correct answer Lower Flammability Limit (LFL)
A ________ is a very small unit of measurement, used in the HVACR industry to
measure a deep vacuum. correct answer Micron
A ____________ is a mixture of 2 or more refrigerants that can separate, or
fractionate, into its original components. correct answer Zeotropic refrigerant
blend
A ____________ purge should be done during the brazing process. correct answer
Low pressure nitrogen
A2L refrigerant cylinders are allowed to be shipped ________, fitting into
standard storage racks. correct answer Horizontally
After a pressure relief valve has been ___________, it should be replaced with a
new one with the same ratings. correct answer Actuated
After a system installation or repair, the first task that should be performed is a
_______________ correct answer Pressurized Leak Test
Always ________ air from the refrigerant hoses to prevent refrigerant
contamination and excessive pressure in the recovery tank. correct answer Purge
ANSWERS
________ of a combustible gas is the rate at which a flame front spreads relative
to the unburned gas ahead of the flame. correct answer Burning velocity
_________ is equal to 760,000 microns. correct answer Atmospheric Pressure (0
psig)
__________ can form when any flouride-containing refrigerant, even non-
flammable A1 refrigerants, undergoes complete or incomplete combustion, or
thermal decomposition. correct answer Hydrogen Fluoride (HF)
__________ requires that if flammable refrigerant cylinders are to be stored in an
enclosure, the enclosure be secure and ventilated correct answer OSHA.
___________ is a measurement of the amount of heat released when a
substance, in this case, a refrigerant, burns. correct answer Heat of Combustion
(HOC)
___________ is the process of removing air and other non-condensables from the
system. correct answer Degassing
____________ are used to determine the maximum concentration of a
refrigerant allowed in an occupied space correct answer Refrigerant
Concentration Limits (RCL).
, _____________ are highly flammable and require additional technician training
for safe use. correct answer Hydrocarbon refrigerants
_______________ of a refrigerant is the minimum concentration of a refrigerant
that can propagate a flame through a consistent mixture of the refrigerant and air
under specified test conditions. correct answer Lower Flammability Limit (LFL)
A ________ is a very small unit of measurement, used in the HVACR industry to
measure a deep vacuum. correct answer Micron
A ____________ is a mixture of 2 or more refrigerants that can separate, or
fractionate, into its original components. correct answer Zeotropic refrigerant
blend
A ____________ purge should be done during the brazing process. correct answer
Low pressure nitrogen
A2L refrigerant cylinders are allowed to be shipped ________, fitting into
standard storage racks. correct answer Horizontally
After a pressure relief valve has been ___________, it should be replaced with a
new one with the same ratings. correct answer Actuated
After a system installation or repair, the first task that should be performed is a
_______________ correct answer Pressurized Leak Test
Always ________ air from the refrigerant hoses to prevent refrigerant
contamination and excessive pressure in the recovery tank. correct answer Purge
