RETA CARO EXAM QUESTIONS WITH 100% VERIFIED ANSWERS

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 which two forms of heat transfer is most common in refrigeration conduction and convecton