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RETA CARO Exam Latest Version 2025 2026| Questions and Accurate Answers | Verified Solution 100% 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
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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
Superheated refrigerant can only be? Vapor Saturated refrigerant can be what? A liquid, vapor or a combination of the two What do you multiply the mass flow rate (lbs./min) by to determine the vapor flow rate through the compressor Specific volume (cubic ft./lbs) Three factors to consider when choosing a refrigerant are Cost, available, and safety One positive characteristic of halocarbon refrigerant is They are usually not flammable Which refrigerant requires the largest compressor displacement per ton R-134a