RETA CARO questions with complete
solutions rated A+
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
Which refrigerant would have the lowest condensing pressure at 95 Degrees F - correct answer ✔✔CFC-
11
solutions rated A+
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
Which refrigerant would have the lowest condensing pressure at 95 Degrees F - correct answer ✔✔CFC-
11
