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EPA 608 Exam| Study Questions Correctly Answered!!
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EPA 608 Exam| Study Questions CorrectlyAnswered!!
What is the result of over-evacuating a system? - ANSWER No damage will be done.
How can a system be leak checked using a low pressure gauge? - ANSWER Vacuum reading
will rise when vacuum pump is turned off.
How close should the vacuum gauge be connected to the vacuum pump during evacuation? -
ANSWER As far away as possible.
When measuring the vacuum of a system being evacuated - ANSWER the system must
be isolated. What must be done to the vacuum pump? Turn it off and valve it off.
What is ozone? - ANSWER 3 atoms of oxygen. It blocks much of the harmful ultraviolet
radiation (uv-b) emitted from the sun and it keeps our earth's temperature stable.
How much ozone can a chlorine atom destroy in the stratosphere? - ANSWER One atom can
destroy 100 000 ozone molecules.
What is Ozone Depletion Potential (ODP)? - ANSWER The ability of any chemical to deplete the
ozone layer.
What is CFC? - ANSWER Chlorofluorocarbon.
Which refrigerants are CFC's? - ANSWER R-11 12 113 114
,Which chemical in the CFC refrigerants does the most damage to the ozone layer? -
ANSWER Chlorine.
What is an HCFC? - ANSWER Hydrochlorofluorocarbons.
Which refrigerants are HCFC's? - ANSWER R-22 123
Which is more harmful to the ozone layer - ANSWER a CFC or an HCFC? CFC's.
What is it about CFC's that make them more harmful to the stratosphere? - ANSWER Chemical
strength they will not breakdown in the lower atmosphere.
What is an HFC? - ANSWER A fluorocarbon that contains no chlorine.
Which refrigerants are HFC's? - ANSWER R-134a 404a 407c 410a.
What is the ODP of the HFC refrigerant? - ANSWER Zero.
Which refrigerants contain chlorine? - ANSWER CFC's and HCFC's.
Which refrigerants have high ODP? - ANSWER CFC's.
Which refrigerants have low ODP? - ANSWER HCFC's HFC's are zero.
What is an azeotrope refrigerant? - ANSWER A mixture of two or more compounds where the
mixture behaves like a single chemical.
Is one of the components of R-500 a CFC? - ANSWER Yes
,Does stratospheric ozone help or hurt the work of the earth's protective shield? - ANSWER It
helps.
What chemical in the stratosphere tells us ozone depletion is occurring? - ANSWER
Chlorine-monoxide.
How do we know the chlorine in the stratosphere is coming from CFC's? - ANSWER The increase in
chlorine and fluorine present in the stratosphere matches the increase in emissions of CFC's.
How do we know CFC's get to the stratosphere? - ANSWER From high altitude air sampling
measurements.
What role does the ozone layer play in protecting the earth? - ANSWER It blocks much of the
harmful ultraviolet radiation (uv-b).
What are the effects on health from increased ultraviolet radiation? - ANSWER Skin
cancer cataracts human immunity is reduced.
What are the effects on the environment? - ANSWER Timber growth is reduced crop yields
lowered marine life and the food chain are impaired.
Is ozone depletion a problem for the United States only or a global problem? - ANSWER A global
problem.
What is the Montreal Protocol? - ANSWER A treaty that called for the reduction of
production of CFC's.
The Montreal Protocol calls for the regulation of what chemicals? - ANSWER Ozone
depleting compounds CFC's HCFC's and Halons.
, On what date was the production and importation of all CFC's phased out? - ANSWER In the
U.S. after December 31 1995
Where will we get replacements? - ANSWER Through recovery of existing refrigerants.
What steps are called for by the Clean Air Act? - ANSWER Taxes on production and
use standards set for the recovery of refrigerants.
What is prohibited by the Clean Air Act? - ANSWER Venting.
Do state and local laws have priority over federal law? Can they be less strict? - ANSWER No.
Cities or states can create their own laws but they must be at least as strict as federal laws.
To prevent damage to the ozone layer - ANSWER the U.S. is making laws to capture the CFC's
now in use. What else does the new law do to restrict the release of CFC's? Allows states and
municipalities to create their own laws to prevent and monitor the release of CFC and HCFC
materials into the atmosphere.
By recovering refrigerants - ANSWER we ensure adequate supplies and prevent venting. What
else does the recovery of refrigerants accomplish? Prevents stratospheric ozone depletion.
The Clean Air Act phases out CFC/HCFC production and prohibits venting. What else does it
require? - ANSWER Standards to be set for recovery of all refrigerants prior to appliance
service and disposal.
Falsifying or failing to keep required records - ANSWER failing to reach required evacuation
levels and knowingly releasing CFC or HCFC refrigerants are a violations of the Clean Air Act.
What activity with a substitute refrigerant is also a violation? Knowingly venting CFC's
HCFC's and their substitutes.
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