EPA 608 UNIVERSAL EXAM SCRIPT
COMPLETE ANSWERS GRADED A+
◉ An example of an HFC refrigerant is: - R-134a
Answer:
◉ Whenever dry nitrogen from a portable cylinder is connected to
a system, what item is of most importance in consideration of
safety? - There is relief in the downstream line from the pressure
regulator.
Answer:
◉ During servicing of a refrigeration system containing R-12, the
refrigerant must be: - recovered.
Answer:
◉ Which safety precaution(s) should always be followed: - Never
apply an open flame to a refrigerant cylinder; never cut or weld
any refrigerant line when refrigerant is in the line; never use
oxygen to purge lines or to pressurize a system.
Answer:
◉ In a vapor compression refrigeration system, cooling occurs
when: - refrigerant liquid turns to a vapor.
Answer:
,◉ The evacuation of a system is a method of: - dehydration.
Answer:
◉ Each chlorine atom in the stratosphere can destroy____ozone
molecules. - 100,000
Answer:
◉ An example of a HFC refrigerant is: - R-410A
Answer:
◉ Which gas(es) would cause the LEAST damage to the
environment during a leak check? - dry nitrogen
Answer:
◉ Refrigerant migrates to the compressor crankcase because of a
difference in______between the refrigerant and the oil. - vapor
pressure.
Answer:
◉ Which refrigerant is an HCFC? - R-22, R-123, R-124
Answer:
, ◉ It is important not to mix R-22 and R-410A refrigerants in the
same container because: - the mixture may be impossible to
reclaim.
Answer:
◉ When using recover unit, the fill level of the recovery tank can
be controlled by: - a mechanical switch; an electronic shut-off
device; weight
Answer:
◉ Which of the following refrigerant releases is a violation of the
EPA prohibition on venting? - release of mixtures of nitrogen and
refrigerant that result from adding nitrogen to a fully charged
appliance to "leak-check" the appliance.
Answer:
◉ Which of the following human health effects could result from
an increase in ultraviolet radiation? - an increase in cataracts
cases
Answer:
◉ Never use an open flame to heat a refrigerant tank because: - it
can result in venting refrigerant to the atmosphere; the tank may
explode, causing serious injury to people nearby; refrigerant in
the tank may decompose, forming a toxic material.
Answer:
COMPLETE ANSWERS GRADED A+
◉ An example of an HFC refrigerant is: - R-134a
Answer:
◉ Whenever dry nitrogen from a portable cylinder is connected to
a system, what item is of most importance in consideration of
safety? - There is relief in the downstream line from the pressure
regulator.
Answer:
◉ During servicing of a refrigeration system containing R-12, the
refrigerant must be: - recovered.
Answer:
◉ Which safety precaution(s) should always be followed: - Never
apply an open flame to a refrigerant cylinder; never cut or weld
any refrigerant line when refrigerant is in the line; never use
oxygen to purge lines or to pressurize a system.
Answer:
◉ In a vapor compression refrigeration system, cooling occurs
when: - refrigerant liquid turns to a vapor.
Answer:
,◉ The evacuation of a system is a method of: - dehydration.
Answer:
◉ Each chlorine atom in the stratosphere can destroy____ozone
molecules. - 100,000
Answer:
◉ An example of a HFC refrigerant is: - R-410A
Answer:
◉ Which gas(es) would cause the LEAST damage to the
environment during a leak check? - dry nitrogen
Answer:
◉ Refrigerant migrates to the compressor crankcase because of a
difference in______between the refrigerant and the oil. - vapor
pressure.
Answer:
◉ Which refrigerant is an HCFC? - R-22, R-123, R-124
Answer:
, ◉ It is important not to mix R-22 and R-410A refrigerants in the
same container because: - the mixture may be impossible to
reclaim.
Answer:
◉ When using recover unit, the fill level of the recovery tank can
be controlled by: - a mechanical switch; an electronic shut-off
device; weight
Answer:
◉ Which of the following refrigerant releases is a violation of the
EPA prohibition on venting? - release of mixtures of nitrogen and
refrigerant that result from adding nitrogen to a fully charged
appliance to "leak-check" the appliance.
Answer:
◉ Which of the following human health effects could result from
an increase in ultraviolet radiation? - an increase in cataracts
cases
Answer:
◉ Never use an open flame to heat a refrigerant tank because: - it
can result in venting refrigerant to the atmosphere; the tank may
explode, causing serious injury to people nearby; refrigerant in
the tank may decompose, forming a toxic material.
Answer:
