RETA CARO EXAM QUESTIONS WITH 100%
VERIFIED ANSWERS
Which refrigerant has the highest mass flow requirement at the same evaporator and condensing
temperature?
CFC-12
which refrigerant is the first to be phased out by Montreal Protocol
CFC-12
As the ratio between the evaporator and condensing pressure increases
the theoretical discharge temperature increases
Under the Montreal Protocol
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
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
oxygen deprivation
the published lower explosive limit for ammonia is
16%
under normal conditions an ammonia vessel should only be filled to what percentage
80%
which refrigerant can be detected by its odor even in low concentrations
R-717
Which refrigerant would have the lowest condensing pressure at 95 Degrees F
CFC-11
A cartridge type gas mask may legally be used for personal protection when
the type of the hazard is known and the concentration is known
a vapor can NOT be
subcooled
what kind of measure is a to of refrigeration
a rate of heat transfer in BTUs per Unit of time
VERIFIED ANSWERS
Which refrigerant has the highest mass flow requirement at the same evaporator and condensing
temperature?
CFC-12
which refrigerant is the first to be phased out by Montreal Protocol
CFC-12
As the ratio between the evaporator and condensing pressure increases
the theoretical discharge temperature increases
Under the Montreal Protocol
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
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
oxygen deprivation
the published lower explosive limit for ammonia is
16%
under normal conditions an ammonia vessel should only be filled to what percentage
80%
which refrigerant can be detected by its odor even in low concentrations
R-717
Which refrigerant would have the lowest condensing pressure at 95 Degrees F
CFC-11
A cartridge type gas mask may legally be used for personal protection when
the type of the hazard is known and the concentration is known
a vapor can NOT be
subcooled
what kind of measure is a to of refrigeration
a rate of heat transfer in BTUs per Unit of time
