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RETA CARO Questions & Revised Correct Answers

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RETA CARO Questions & Revised Correct Answers. Which refrigerant has the highest mass flow requirement at the same evaporator and condensing temperature? - ANSWER : CFC-12 which refrigerant is the first to be phased out by Montreal Protocol - ANSWER : CFC-12 As the ratio between the evaporator and condensing pressure increases - ANSWER : the theoretical discharge temperature increases Under the Montreal Protocol - 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 - 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 - ANSWER : oxygen deprivation the published lower explosive limit for ammonia is - ANSWER : 16%

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