HED4802 Portfolio Assessment - Due January 2026
What characteristic or characteristics of CFCs make them more likely than other chlorine compounds to
reach the stratosphere? - ANSWERS Dont disolve iin water
Each chlorine atom in the stratosphere can destroy how many ozone molecules? - ANSWERS 100,000
ozone molecules
Which refrigerant contains a CFC?
R500, R12, R113 or R11? - ANSWERS Theyre all CFC's
HYDROCHLORIC FLORICCARBON (HCFC) refrigerant contain? - ANSWERS Hydrogen, chlorine, flourine
and carbon
Which refrigerant is a chlorine free refrigerant? - ANSWERS HFC R 134A
What is the result damage to the ozone layer? - ANSWERS Increases in human skin cancer
According to the EPA, chlorine in the stratosphere is believed to come primarily from the CFCs rather
than from volcanoes because - ANSWERS -) The rise in the amount of chlorine measured in the
stratosphere over the past 2 decades matches the rise of chlorine which has different natural sources of
chlorune overthe same period
-) The rise of chlorine in the statosphere matches the rise in CFCs over the same period
-) samples of air taken over erupting volcanoes shows that volcanoes contribute a small amount of
chlorine in the stratosphere compared to CFCs
-) ALL OF THE ABOVE
Which is a violation of the EPA clean air act? - ANSWERS -) falsifying or failing to keep required records
,-) failing to keep evacuation levels before opening or disposing of appliances
-) knowingly releasing HFC's, HCFCs or CFC refrigerants
-) ALL OF THE ABOVE
Discarding of disposable cylinders is accomplished by - ANSWERS Assuring that all refrigerant is
recovered and that the cylinders are rendered useless then recycle the metal
How much money can be awarded to a person who supplies information leading to a conviction against
the technician who is intentionally venting refrigerants or violatingsome other provision of the EPA
CLEAN AIR ACT - ANSWERS $10,000
CFC's will no longer be manufactured or imported into the U.S. after what year? - ANSWERS 1995
Since July 1, 1992 it has been illegal to: - ANSWERS Knowingly releasing HCF or HCFC refrigerants in the
U.S.
Which compounds are controlled by the Montreal protocol? - ANSWERS -) chloric floric carbons
-) hydro chloric carbons
-) halons
-) all of the above
EPA regulations cover all AC and refrigeration equipment when containing what? - ANSWERS Any
refrigerant or refrigerant substitute
The syntetic substitute currently usedwith blends containing HCFCs is: - ANSWERS Alcobenzine
What is the significance of atheotropic mixture: - ANSWERS The mixture combines to act as a single
compound refrigerant
Cooling occurs in a vapor compression refrigeration system when: - ANSWERS Refrigerant liquid boils
into a vapor
,Ozone depletion in the stratosphere is what type of problem: - ANSWERS Its a GLOBAL problem
The definition of recover is: - ANSWERS To remove refrigerant in any condition from a system and store
it an external container without neccesarily testing it
Which of the following leak detection methods is considered by the EPA to be the effective for locating
the general area of small leaks? - ANSWERS Electronic ultrasonic testers
Recovery during low ambient temperatures will: - ANSWERS Slow the recovery process
During dehydration of a refrigeration system the refrigeration system is heated to: - ANSWERS Decrease
dehydration time
To determine the safe pressure for leak testing one should use: - ANSWERS Low side test data plate
value
Care should be used to avoid over filling refrigerant storage cylinders because: - ANSWERS The internal
pressure of the cylinders may rise and cause an explosion
When transporting cylinders containing used refrigerants DOT REQUIRES that you: - ANSWERS attach
DOT classification tags
What is the significance of an azeotropic mixture? - ANSWERS The mixture combines to act like a single
component refrigerant
CF Cs are more likely to reach the stratosphere than other chlorine-containing compounds
because___________. - ANSWERS They are chemically very stable
Chlorofuorocarbons, or CFCs, consist ofwhich of the following chemicals? - ANSWERS Chlorine, fluorine
and carbon
, Which compound are the most damaging to the stratospheric ozone layer and have the highest ozone
depletion potential rating? - ANSWERS CFCs
________ test methods are assumed by the EPA as the most effective methods for locating the general
area of small leaks. - ANSWERS Electronic and ultrasonic
If a reclamation company is shipping a cylinder containing mixed refrigerants they may ______. -
ANSWERS Agree to destroy the refrigerant but typically a substantial fee is charged
One chlorine atom in the stratosphere is capable of destroying how many ozone molecules? - ANSWERS
100,000
________is a CFC.
A) R-141b
B) R- 134a
C) R-502
D) R-123 - ANSWERS R-502
HCFC refrigerants cause ____________ damage to the stratospheric ozone layer in comparison to CFC
refrigerants. - ANSWERS Less
The system vacuum gauge should be connected __________? - ANSWERS As far as possible from the
vacuum pump.
Manufacture of CFCs was banned as of December 31, _______?
A) 1994
B) 1995
C) 2000
D) 2010 - ANSWERS 1995
What characteristic or characteristics of CFCs make them more likely than other chlorine compounds to
reach the stratosphere? - ANSWERS Dont disolve iin water
Each chlorine atom in the stratosphere can destroy how many ozone molecules? - ANSWERS 100,000
ozone molecules
Which refrigerant contains a CFC?
R500, R12, R113 or R11? - ANSWERS Theyre all CFC's
HYDROCHLORIC FLORICCARBON (HCFC) refrigerant contain? - ANSWERS Hydrogen, chlorine, flourine
and carbon
Which refrigerant is a chlorine free refrigerant? - ANSWERS HFC R 134A
What is the result damage to the ozone layer? - ANSWERS Increases in human skin cancer
According to the EPA, chlorine in the stratosphere is believed to come primarily from the CFCs rather
than from volcanoes because - ANSWERS -) The rise in the amount of chlorine measured in the
stratosphere over the past 2 decades matches the rise of chlorine which has different natural sources of
chlorune overthe same period
-) The rise of chlorine in the statosphere matches the rise in CFCs over the same period
-) samples of air taken over erupting volcanoes shows that volcanoes contribute a small amount of
chlorine in the stratosphere compared to CFCs
-) ALL OF THE ABOVE
Which is a violation of the EPA clean air act? - ANSWERS -) falsifying or failing to keep required records
,-) failing to keep evacuation levels before opening or disposing of appliances
-) knowingly releasing HFC's, HCFCs or CFC refrigerants
-) ALL OF THE ABOVE
Discarding of disposable cylinders is accomplished by - ANSWERS Assuring that all refrigerant is
recovered and that the cylinders are rendered useless then recycle the metal
How much money can be awarded to a person who supplies information leading to a conviction against
the technician who is intentionally venting refrigerants or violatingsome other provision of the EPA
CLEAN AIR ACT - ANSWERS $10,000
CFC's will no longer be manufactured or imported into the U.S. after what year? - ANSWERS 1995
Since July 1, 1992 it has been illegal to: - ANSWERS Knowingly releasing HCF or HCFC refrigerants in the
U.S.
Which compounds are controlled by the Montreal protocol? - ANSWERS -) chloric floric carbons
-) hydro chloric carbons
-) halons
-) all of the above
EPA regulations cover all AC and refrigeration equipment when containing what? - ANSWERS Any
refrigerant or refrigerant substitute
The syntetic substitute currently usedwith blends containing HCFCs is: - ANSWERS Alcobenzine
What is the significance of atheotropic mixture: - ANSWERS The mixture combines to act as a single
compound refrigerant
Cooling occurs in a vapor compression refrigeration system when: - ANSWERS Refrigerant liquid boils
into a vapor
,Ozone depletion in the stratosphere is what type of problem: - ANSWERS Its a GLOBAL problem
The definition of recover is: - ANSWERS To remove refrigerant in any condition from a system and store
it an external container without neccesarily testing it
Which of the following leak detection methods is considered by the EPA to be the effective for locating
the general area of small leaks? - ANSWERS Electronic ultrasonic testers
Recovery during low ambient temperatures will: - ANSWERS Slow the recovery process
During dehydration of a refrigeration system the refrigeration system is heated to: - ANSWERS Decrease
dehydration time
To determine the safe pressure for leak testing one should use: - ANSWERS Low side test data plate
value
Care should be used to avoid over filling refrigerant storage cylinders because: - ANSWERS The internal
pressure of the cylinders may rise and cause an explosion
When transporting cylinders containing used refrigerants DOT REQUIRES that you: - ANSWERS attach
DOT classification tags
What is the significance of an azeotropic mixture? - ANSWERS The mixture combines to act like a single
component refrigerant
CF Cs are more likely to reach the stratosphere than other chlorine-containing compounds
because___________. - ANSWERS They are chemically very stable
Chlorofuorocarbons, or CFCs, consist ofwhich of the following chemicals? - ANSWERS Chlorine, fluorine
and carbon
, Which compound are the most damaging to the stratospheric ozone layer and have the highest ozone
depletion potential rating? - ANSWERS CFCs
________ test methods are assumed by the EPA as the most effective methods for locating the general
area of small leaks. - ANSWERS Electronic and ultrasonic
If a reclamation company is shipping a cylinder containing mixed refrigerants they may ______. -
ANSWERS Agree to destroy the refrigerant but typically a substantial fee is charged
One chlorine atom in the stratosphere is capable of destroying how many ozone molecules? - ANSWERS
100,000
________is a CFC.
A) R-141b
B) R- 134a
C) R-502
D) R-123 - ANSWERS R-502
HCFC refrigerants cause ____________ damage to the stratospheric ozone layer in comparison to CFC
refrigerants. - ANSWERS Less
The system vacuum gauge should be connected __________? - ANSWERS As far as possible from the
vacuum pump.
Manufacture of CFCs was banned as of December 31, _______?
A) 1994
B) 1995
C) 2000
D) 2010 - ANSWERS 1995
