RETA CARO EXAM QUESTIONS WITH
COMPLETE SOLUTIONS 2025/2026
Which refrigerant has the highest mass flow requirement at the same evaporator and
condensing temperature? - ANSWERSCFC-12
which refrigerant is the first to be phased out by Montreal Protocol - ANSWERSCFC-12
As the ratio between the evaporator and condensing pressure increases -
ANSWERSthe theoretical discharge temperature increases
Under the Montreal Protocol - ANSWERSas 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 - ANSWERSEither 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 -
ANSWERSoxygen deprivation
the published lower explosive limit for ammonia is - ANSWERS16%
under normal conditions an ammonia vessel should only be filled to what percentage -
ANSWERS80%
which refrigerant can be detected by its odor even in low concentrations - ANSWERSR-
717
Which refrigerant would have the lowest condensing pressure at 95 Degrees F -
ANSWERSCFC-11
the condition of a boiling liquid is what - ANSWERSsaturated
What kind of measurement is a ton of refrigeration - ANSWERSA rate of heat transfer in
BTUs per unit of time
Which is greater 10psia or 10psig - ANSWERS10psig is greater than 10paia
What do you multiply the mass flow rate (lbs./min) by to determine the vapor flow rate
through the compressor - ANSWERSSpecific volume (cubic ft./lbs)
COMPLETE SOLUTIONS 2025/2026
Which refrigerant has the highest mass flow requirement at the same evaporator and
condensing temperature? - ANSWERSCFC-12
which refrigerant is the first to be phased out by Montreal Protocol - ANSWERSCFC-12
As the ratio between the evaporator and condensing pressure increases -
ANSWERSthe theoretical discharge temperature increases
Under the Montreal Protocol - ANSWERSas 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 - ANSWERSEither 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 -
ANSWERSoxygen deprivation
the published lower explosive limit for ammonia is - ANSWERS16%
under normal conditions an ammonia vessel should only be filled to what percentage -
ANSWERS80%
which refrigerant can be detected by its odor even in low concentrations - ANSWERSR-
717
Which refrigerant would have the lowest condensing pressure at 95 Degrees F -
ANSWERSCFC-11
the condition of a boiling liquid is what - ANSWERSsaturated
What kind of measurement is a ton of refrigeration - ANSWERSA rate of heat transfer in
BTUs per unit of time
Which is greater 10psia or 10psig - ANSWERS10psig is greater than 10paia
What do you multiply the mass flow rate (lbs./min) by to determine the vapor flow rate
through the compressor - ANSWERSSpecific volume (cubic ft./lbs)
