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CFC Core updated exam 2023# 75 questions and answers.
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CFC Core updated exam 2023# 75questions and answers.
Letters A or B indicate - -Level of toxicity.
B = higher
-Number 1, 2, and 3 indicate levels - -of flammability. 3 =
highest
-A1 Refrigerants - -R-11, R-12, R-22, R-500, R-502, R-134a
-B1 Refrigerants - -R-123
-Check refrigerants containers every ____ years for a current
hydrostatic test before use - -5
-December 31, 1995 - -CFC production stopped
-CFC Regrigerants - -R-11, R-12, R-13, R-14, R-113, R-114
-CFC refrigerants are classified as Class __ subtances - -1
-Class 1 substance is a refrigerant that poses the highest danger
to the environment - -...
-HCFC's will be produced until the year - -2030
-HCFC are not as stable as CFC molecules and have a much
shorter lifespan - -...
-HCFC refrigerants - -R-22, R-123, R-124
-HCFC refrigerants are classified as Class __ substances - -2
-Class 2 substances are considered to present a medium danger
to the environment - -...
-HFC-134a is a replacement for - -R-12
, -HFC refrigerants - -R-32, R-134a, R-152a, R-125
-R-11 and R-123 are considered _____ pressure refrigerants - -
low
-There is no HFC replacement for R-11, but HCFC-123 is
considered the interim replacement. - -...
-Azeotropic mixture - -A refrigerant blend that behaves like a
new refrigerant made from one chemical. 500 series
-Zeotropic mixtures - -A refrigerant blend in which individual
refrigerants of the mixture behave independently. 400 series.
-Ffractionation - -when liquid and vapor coexist simultaneously,
with one or more refrigerants are leaking at faster rates than
other refrigerants of the same blend.
-Temperature glide - -The range of temperatures where
refrigerants condense or evaporate for one given presure.
-Alkylbenzene is a refrigerant lubricant used with - -HCFC
based refrigerants
-Glycols and esters are refrigerant lubricants used with - -HFC
based refrigerants
-Glycol lubricants are hygroscopic, meaning - -they absorb
water.
-Glycol lubricants cannot be retrofitted - -...
-An ester lubricants is a second generation lubricant widely used
with - -HFC based refrigerants.
-Ester lubricants cannot be mixed with any other lubricant - -...
-Mineral oil is used to lubricate - -CFC refrigerants
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