RETA CARO Exam 2023 Solved Correctly
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
which two forms of heat transfer is most common in refrigeration
conduction and convecton
the condition of a boiling liquid is what
saturated
What kind of measurement is a ton of refrigeration
A rate of heat transfer in BTUs per unit of time
Which is greater 10psia or 10psig
10psig is greater than 10paia
The latent heat of condensation of a substance is the same as what
The latent heat of evaporation of the substance
Superheat is found in an air conditioning system in the:
Compressor suction line and it's discharge line
Subcooled refrigerant can only be what
Liquid
Superheated refrigerant can only be ?
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
which two forms of heat transfer is most common in refrigeration
conduction and convecton
the condition of a boiling liquid is what
saturated
What kind of measurement is a ton of refrigeration
A rate of heat transfer in BTUs per unit of time
Which is greater 10psia or 10psig
10psig is greater than 10paia
The latent heat of condensation of a substance is the same as what
The latent heat of evaporation of the substance
Superheat is found in an air conditioning system in the:
Compressor suction line and it's discharge line
Subcooled refrigerant can only be what
Liquid
Superheated refrigerant can only be ?
