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 incre...
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 ?
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