CFESA Refrigeration Chapter 3
Exam Questions with Solutions
Why is the issue of refrigerant so difficult today? - -Because there are so
many different refrigerants used today.
- What is the problem caused by CFC refrigerants? - -They are depleting the
O Zone layer in the atmosphere.
- Why must refrigerants be recovered? - -It is the law, and to protect the
environment.
- What are HCFC refrigerants? - -They are interim refrigerants except for R-
22, and they have a low ozone depletion potential.
- What are HFC refrigerants? - -The newer refrigerants with a zero o-zone
depletion potential.
- Which type of refrigerant is preferable? - -HFC refrigerants because they
have no potential to deplete the o-zone layer.
- Why not just use HFC refrigerants all of the time? - -It can be a major job
to switch to the new HFC refrigerants due to the hard task of removing all of
the old mineral oil and replacing it with the new Polyolester oil.
- What qualities must refrigerants have? - -P/T relationship, low boiling
point, non-toxic, non-flammable, non-explosive
- What type of oil is used with R-12? - -Mineral oil
- What is R-22 used for? - -It has been primarily used in air conditioning. It is
now being also used for coolers.
- What type of oil is used with R-22? - -Mineral Oil
- What type of refrigerant is R-22? - -HCFC
- What is the problem with using R-22 on low temperature applications? - -It
has a very high condensing temperature due to high heat of compression
that results in premature compressor failure on freezers. It requires specially
designed compressors to stand up to the heat stress.
- What was R-502 used for? - -Some cooler, but mainly for freezers.
Exam Questions with Solutions
Why is the issue of refrigerant so difficult today? - -Because there are so
many different refrigerants used today.
- What is the problem caused by CFC refrigerants? - -They are depleting the
O Zone layer in the atmosphere.
- Why must refrigerants be recovered? - -It is the law, and to protect the
environment.
- What are HCFC refrigerants? - -They are interim refrigerants except for R-
22, and they have a low ozone depletion potential.
- What are HFC refrigerants? - -The newer refrigerants with a zero o-zone
depletion potential.
- Which type of refrigerant is preferable? - -HFC refrigerants because they
have no potential to deplete the o-zone layer.
- Why not just use HFC refrigerants all of the time? - -It can be a major job
to switch to the new HFC refrigerants due to the hard task of removing all of
the old mineral oil and replacing it with the new Polyolester oil.
- What qualities must refrigerants have? - -P/T relationship, low boiling
point, non-toxic, non-flammable, non-explosive
- What type of oil is used with R-12? - -Mineral oil
- What is R-22 used for? - -It has been primarily used in air conditioning. It is
now being also used for coolers.
- What type of oil is used with R-22? - -Mineral Oil
- What type of refrigerant is R-22? - -HCFC
- What is the problem with using R-22 on low temperature applications? - -It
has a very high condensing temperature due to high heat of compression
that results in premature compressor failure on freezers. It requires specially
designed compressors to stand up to the heat stress.
- What was R-502 used for? - -Some cooler, but mainly for freezers.
