QUESTIONS WITH SOLUTIONS GRADED A+
◉ 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%