A2L Comprehensive Assessment Paper Questions with Correct
Answers (Grade A+)
Question 1: Refrigerant cylinders may be transported in the _________________ position
Answer: upright or horizontal
Question 2: When working with any refrigerant, flammable or non-flammable, always refer the
__________________________ for specific hazards and hazard mitigation actions
Answer: safety data sheets (SDS)
Question 3: DOT regulations require refrigerant cylinders containing over 2.2 lbs. of a 2L refrigerant
to be equipped with a ____________________________________ instead of a rupture disc
Answer: pressure relief valve
Question 4: OSHA requires that if flammable refrigerant cylinders are to be stored in an enclosure, the
enclosure be _____________________ and _____________________
Answer: secure and ventilated.
Question 5: When servicing or installing equipment charged with a flammable refrigerant, the jobsite
should be evaluated for safety hazards, such as possible ignition sources or the presence of flammable
vapors ________________________________ any work
Answer: prior to beginning
Question 6: Specific applications and use limitations for the installation of A2L equipment can be
found in the _________________________________
Answer: manufacturer's literature (installation manual).
Question 7: When working with a flammable refrigerant, recommended PPE can be found in the
________________________
Answer: Safety Data Sheets (SDS).
Question 8: With proper ventilation on a jobsite or work area, flammable refrigerants can be kept
below their ______________________________ should a leak occur
Answer: lower flammability limit (LFL)
Page 1
, Question 9: Accumulation of a flammable refrigerant in a confined space can lead to a
_______________________ or _________________________
Answer: a severe ignition event or asphyxiation.
Question 10: Underwriters Laboratories' (UL) standards require that systems charged with a
flammable refrigerant have a label affixed to the unit that is filled out by
________________________________
Answer: the installing technician.
Question 11: EPA Section 608 regulations require that if a system is charged with a flammable
refrigerant, the equipment must have ________________________ on the service and access valves
which must extend at least 1 inch in each direction
Answer: red markings
Question 12: __________________________ is a measurement of the amount of heat released when a
substance, in this case, a refrigerant, burns
Answer: Heat of combustion (HOC)
Question 13: The_________________________ is the minimum electrical spark energy, in millijoules
(mJ), required to ignite a flammable gas/air mixture
Answer: minimum ignition energy (MIE)
Question 14: The ______________________ of a combustible gas (flammable refrigerant) is the rate at
which a flame front spreads relative to the unburned gas ahead of the flame
Answer: burning velocity
Question 15: The ________________________________ is the lowest of three calculated limits for:
toxicity, oxygen deprivation (asphyxiation), and/or flammability
Answer: refrigerant concentration Limit (RCL)
Question 16: The ________________________________ is the minimum concentration of a flammable
substance, in this case a refrigerant, that is capable of ignition when there is a sufficient mixture of air
and the substance
Answer: lower flammability limit (LFL)
Page 2
Answers (Grade A+)
Question 1: Refrigerant cylinders may be transported in the _________________ position
Answer: upright or horizontal
Question 2: When working with any refrigerant, flammable or non-flammable, always refer the
__________________________ for specific hazards and hazard mitigation actions
Answer: safety data sheets (SDS)
Question 3: DOT regulations require refrigerant cylinders containing over 2.2 lbs. of a 2L refrigerant
to be equipped with a ____________________________________ instead of a rupture disc
Answer: pressure relief valve
Question 4: OSHA requires that if flammable refrigerant cylinders are to be stored in an enclosure, the
enclosure be _____________________ and _____________________
Answer: secure and ventilated.
Question 5: When servicing or installing equipment charged with a flammable refrigerant, the jobsite
should be evaluated for safety hazards, such as possible ignition sources or the presence of flammable
vapors ________________________________ any work
Answer: prior to beginning
Question 6: Specific applications and use limitations for the installation of A2L equipment can be
found in the _________________________________
Answer: manufacturer's literature (installation manual).
Question 7: When working with a flammable refrigerant, recommended PPE can be found in the
________________________
Answer: Safety Data Sheets (SDS).
Question 8: With proper ventilation on a jobsite or work area, flammable refrigerants can be kept
below their ______________________________ should a leak occur
Answer: lower flammability limit (LFL)
Page 1
, Question 9: Accumulation of a flammable refrigerant in a confined space can lead to a
_______________________ or _________________________
Answer: a severe ignition event or asphyxiation.
Question 10: Underwriters Laboratories' (UL) standards require that systems charged with a
flammable refrigerant have a label affixed to the unit that is filled out by
________________________________
Answer: the installing technician.
Question 11: EPA Section 608 regulations require that if a system is charged with a flammable
refrigerant, the equipment must have ________________________ on the service and access valves
which must extend at least 1 inch in each direction
Answer: red markings
Question 12: __________________________ is a measurement of the amount of heat released when a
substance, in this case, a refrigerant, burns
Answer: Heat of combustion (HOC)
Question 13: The_________________________ is the minimum electrical spark energy, in millijoules
(mJ), required to ignite a flammable gas/air mixture
Answer: minimum ignition energy (MIE)
Question 14: The ______________________ of a combustible gas (flammable refrigerant) is the rate at
which a flame front spreads relative to the unburned gas ahead of the flame
Answer: burning velocity
Question 15: The ________________________________ is the lowest of three calculated limits for:
toxicity, oxygen deprivation (asphyxiation), and/or flammability
Answer: refrigerant concentration Limit (RCL)
Question 16: The ________________________________ is the minimum concentration of a flammable
substance, in this case a refrigerant, that is capable of ignition when there is a sufficient mixture of air
and the substance
Answer: lower flammability limit (LFL)
Page 2
