RETA CARO TEST QUESTIONS
AND ANSWERS
Which refrigerant requires the biggest mass flow at the same evaporator and
condensing temperatures? - Answer: CFC-12.
Which refrigerant is the first to be phased out by the Montreal Protocol? -
Answer: CFC-12
As the ratio between the evaporator and condensing pressure increases, the
theoretical discharge temperature rises.
According to the Montreal Protocol, as long as a technician does not undertake
work on the refrigerant-containing elements of a system, they do not need to be
certified.
Refrigerant leaks are discovered using the ANSWER. A sulphur stick on
ammonia or an electronic leak detector for CFCs or HCFCs.
The main cause for concern about CFC-12 levels 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? ANSWER: 80%
Which refrigerant's odour can be detected even at low concentrations? - Answer
R-717
Which refrigerant would have the lowest condensing pressure at 95 degrees F?
ANSWER: CFC-11
AND ANSWERS
Which refrigerant requires the biggest mass flow at the same evaporator and
condensing temperatures? - Answer: CFC-12.
Which refrigerant is the first to be phased out by the Montreal Protocol? -
Answer: CFC-12
As the ratio between the evaporator and condensing pressure increases, the
theoretical discharge temperature rises.
According to the Montreal Protocol, as long as a technician does not undertake
work on the refrigerant-containing elements of a system, they do not need to be
certified.
Refrigerant leaks are discovered using the ANSWER. A sulphur stick on
ammonia or an electronic leak detector for CFCs or HCFCs.
The main cause for concern about CFC-12 levels 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? ANSWER: 80%
Which refrigerant's odour can be detected even at low concentrations? - Answer
R-717
Which refrigerant would have the lowest condensing pressure at 95 degrees F?
ANSWER: CFC-11
