Massachusetts Refrigeration License Exam –
Refrigerants & Oils Practice Questions with 100%
Verified Answers | Complete MA Refrigeration Exam
Prep | 2026–2027
, undesirable refrigerant characteristics are Low critical temperature and high freezing point
a desired chemical refrigerant characteristic is stability
what refrigerant breaks down and forms phosgene in the R-11
presence of a carbon flame
when heated R-12 changes to Phosgene gas
what would NOT help eliminate odors in vapors neutralization
anhydrous ammonia is ammonia without any water
refrigerant is subcooled to increase the refrigeration effect
aluminum CANNOT be used with R-40
Any water in the refrigerant of a Freon system would cause frozen expansion valve
a
of the following refrigerants, which is least flammable and Freon-11
least toxic? Methyl chloride, Ammonia, Propane, Freon-11
calcium chloride freezes at -41°F
how do you know whether you have enough refrigerant by the gauge glass on the receiver
charge in an ammonia system
in a R-12 system with too much refrigerant, what will high head pressure
happen
sodium chloride is NOT recommended for use in 0°F
temperatures below
the instrument that measures the specific gravity of a brine hydrometer
is a
Refrigerants & Oils Practice Questions with 100%
Verified Answers | Complete MA Refrigeration Exam
Prep | 2026–2027
, undesirable refrigerant characteristics are Low critical temperature and high freezing point
a desired chemical refrigerant characteristic is stability
what refrigerant breaks down and forms phosgene in the R-11
presence of a carbon flame
when heated R-12 changes to Phosgene gas
what would NOT help eliminate odors in vapors neutralization
anhydrous ammonia is ammonia without any water
refrigerant is subcooled to increase the refrigeration effect
aluminum CANNOT be used with R-40
Any water in the refrigerant of a Freon system would cause frozen expansion valve
a
of the following refrigerants, which is least flammable and Freon-11
least toxic? Methyl chloride, Ammonia, Propane, Freon-11
calcium chloride freezes at -41°F
how do you know whether you have enough refrigerant by the gauge glass on the receiver
charge in an ammonia system
in a R-12 system with too much refrigerant, what will high head pressure
happen
sodium chloride is NOT recommended for use in 0°F
temperatures below
the instrument that measures the specific gravity of a brine hydrometer
is a
