RETA CARO EXAM WITH 100% CORRECT ANSWERS

RETA CARO EXAM WITH 100% CORRECT ANSWERS Which refrigerant has the highest mass flow requirement at the same evaporator and condensing temperature? -Correct Answer-CFC-12 which refrigerant is the first to be phased out by Montreal Protocol -Correct Answer-CFC-12 As the ratio between the evaporator and condensing pressure increases -Correct Answer-the theoretical discharge temperature increases Under the Montreal Protocol -Correct Answer-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 -Correct Answer-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 -Correct Answer-oxygen deprivation the published lower explosive limit for ammonia is -Correct Answer-16% under normal conditions an ammonia vessel should only be filled to what percentage -Correct Answer-80% which refrigerant can be detected by its odor even in low concentrations -Correct Answer-R-717 Which refrigerant would have the lowest condensing pressure at 95 Degrees F -Correct Answer-CFC-11 A cartridge type gas mask may legally be used for personal protection when -Correct Answer-the type of the hazard is known and the concentration is known a vapor