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RETA CARO
WITH CORRECT SOLUTIONS.
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
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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 can NOT be - correct answer- subcooled
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