RETA CARO UPDATED ACTUAL Exam
Questions and CORRECT Answers
Which refrigerant has the highest mass flow requirement at the same evaporator and condensing
temperature? - CORRECT ANSWER - CFC-12
which refrigerant is the first to be phased out by Montreal Protocol - CORRECT
ANSWER - CFC-12
As the ratio between the evaporator and condensing pressure increases - CORRECT
ANSWER - the theoretical discharge temperature increases
Under the Montreal Protocol - CORRECT ANSWER - as long as a technician does not
perform work on the refrigerant containing portions of a system they do not need to be certified
Refrigerant leaks are detected using - CORRECT ANSWER - Either a sulfur stick on
ammonia or electronic leak detector for CFCs or HCFCs
the primary reason for concern about CFC-12 concentration in an engine room is - CORRECT
ANSWER - oxygen deprivation
the published lower explosive limit for ammonia is - CORRECT ANSWER - 16%
under normal conditions an ammonia vessel should only be filled to what percentage -
CORRECT ANSWER - 80%
which refrigerant can be detected by its odor even in low concentrations - CORRECT
ANSWER - R-717
Questions and CORRECT Answers
Which refrigerant has the highest mass flow requirement at the same evaporator and condensing
temperature? - CORRECT ANSWER - CFC-12
which refrigerant is the first to be phased out by Montreal Protocol - CORRECT
ANSWER - CFC-12
As the ratio between the evaporator and condensing pressure increases - CORRECT
ANSWER - the theoretical discharge temperature increases
Under the Montreal Protocol - CORRECT ANSWER - as long as a technician does not
perform work on the refrigerant containing portions of a system they do not need to be certified
Refrigerant leaks are detected using - CORRECT ANSWER - Either a sulfur stick on
ammonia or electronic leak detector for CFCs or HCFCs
the primary reason for concern about CFC-12 concentration in an engine room is - CORRECT
ANSWER - oxygen deprivation
the published lower explosive limit for ammonia is - CORRECT ANSWER - 16%
under normal conditions an ammonia vessel should only be filled to what percentage -
CORRECT ANSWER - 80%
which refrigerant can be detected by its odor even in low concentrations - CORRECT
ANSWER - R-717
