EPA 608 STUDY MATERIAL CORE TYPE 1 2
AND 3 COMPREHENSIVE QUESTIONS
AND SOLUTIONS
◉ It is the best practice to use dry nitrogen to break the vacuum
when dehydrating by the triple evacuation method. However, it:
Answer: Requires a pressure regulator
◉ Approved refrigerant recovery cylinders can be identified by
which color code
Answer: Yellow tops and grey bodies
◉ What type of synthetic oils are commonly used in new HFC
systems and for retrofitting HCFC equipment to HFC refrigerants
Answer: Polyester
◉ When using nitrogen in repairing a sealed refrigeration system,
what should the nitrogen tank always be equipped with
Answer: Regulator
◉ Which of the following factors affect the speed of system
dehydration
Answer: The ambient temperature and the amount of moisture in
the system
,◉ Which of the following repairs would always be considered
"major" under EPA regulations
Answer: Replacement of an evaporator coil
◉ When a pungent order is detected during a sealed system
recovery and/or repair which of the following is most likely
Answer: A compressor burnout has occurred
◉ Which of the following best describes low loss fittings on
refrigerant recovery devices used to recover CFCs, HCFCs, and
HFCs
Answer: They can be either manually closed or automatically
closed when disconnected to prevent loss of refrigerant from
hoses
◉ What is the state of the refrigerant leaving the receiver in a
refrigeration system
Answer: High pressure liquid
◉ What should be used to remove ice from sight glasses or
viewing glasses
Answer: An alcohol spray
◉ In which component of a system does the refrigerant change
from a high-pressure vapor to a high-pressure liquid
,Answer: Condenser
◉ How should refrigerant cylinders be positioned when they are
shipped
Answer: Upright
◉ Why are some hydroflouroolefin(HFO) refrigerant classified as
a "A2L"
Answer: They are less flammable than hydrocarbon refrigerants
but most are still mildly flammable
◉ Which of the following gases is used as the baseline
measurement for global warming potential
Answer: Carbon dioxide
◉ A very large refrigerant leak can cause suffocation because
refrigerants
Answer: Are heavier than air and displace oxygen
◉ When evacuating a system the use of a severely oversized
vacuum pump could
Answer: Cause trapped water to freeze
◉ What are the two factors that if present are most likely to lead
to an explosion with hydrocarbon refrigerants
, Answer: A sufficient concentration of the refrigerant in the space
and an ignition source
◉ After recovering refrigerant from a sealed system if nitrogen is
used to pressurize or below debris out of the system the nitrogen
Answer: May be vented to the ambient air
◉ Which of the following are recommended safe work practices
when recovering refrigerants
Answer: Wear safety eyewear and butyl-lined gloves when
connecting/disconnecting hoses
◉ What effect will low ambient temperatures have on recovery
Answer: Increase the recovery time
◉ Which of the following is true if a system will not hold the
vacuum after it has been evacuated
Answer: The system may be leaking
◉ How would you remove moisture from refrigerant in a system
Answer: Use a filter drier
◉ Which of the following statements about "self contained"
recovery devices is true
AND 3 COMPREHENSIVE QUESTIONS
AND SOLUTIONS
◉ It is the best practice to use dry nitrogen to break the vacuum
when dehydrating by the triple evacuation method. However, it:
Answer: Requires a pressure regulator
◉ Approved refrigerant recovery cylinders can be identified by
which color code
Answer: Yellow tops and grey bodies
◉ What type of synthetic oils are commonly used in new HFC
systems and for retrofitting HCFC equipment to HFC refrigerants
Answer: Polyester
◉ When using nitrogen in repairing a sealed refrigeration system,
what should the nitrogen tank always be equipped with
Answer: Regulator
◉ Which of the following factors affect the speed of system
dehydration
Answer: The ambient temperature and the amount of moisture in
the system
,◉ Which of the following repairs would always be considered
"major" under EPA regulations
Answer: Replacement of an evaporator coil
◉ When a pungent order is detected during a sealed system
recovery and/or repair which of the following is most likely
Answer: A compressor burnout has occurred
◉ Which of the following best describes low loss fittings on
refrigerant recovery devices used to recover CFCs, HCFCs, and
HFCs
Answer: They can be either manually closed or automatically
closed when disconnected to prevent loss of refrigerant from
hoses
◉ What is the state of the refrigerant leaving the receiver in a
refrigeration system
Answer: High pressure liquid
◉ What should be used to remove ice from sight glasses or
viewing glasses
Answer: An alcohol spray
◉ In which component of a system does the refrigerant change
from a high-pressure vapor to a high-pressure liquid
,Answer: Condenser
◉ How should refrigerant cylinders be positioned when they are
shipped
Answer: Upright
◉ Why are some hydroflouroolefin(HFO) refrigerant classified as
a "A2L"
Answer: They are less flammable than hydrocarbon refrigerants
but most are still mildly flammable
◉ Which of the following gases is used as the baseline
measurement for global warming potential
Answer: Carbon dioxide
◉ A very large refrigerant leak can cause suffocation because
refrigerants
Answer: Are heavier than air and displace oxygen
◉ When evacuating a system the use of a severely oversized
vacuum pump could
Answer: Cause trapped water to freeze
◉ What are the two factors that if present are most likely to lead
to an explosion with hydrocarbon refrigerants
, Answer: A sufficient concentration of the refrigerant in the space
and an ignition source
◉ After recovering refrigerant from a sealed system if nitrogen is
used to pressurize or below debris out of the system the nitrogen
Answer: May be vented to the ambient air
◉ Which of the following are recommended safe work practices
when recovering refrigerants
Answer: Wear safety eyewear and butyl-lined gloves when
connecting/disconnecting hoses
◉ What effect will low ambient temperatures have on recovery
Answer: Increase the recovery time
◉ Which of the following is true if a system will not hold the
vacuum after it has been evacuated
Answer: The system may be leaking
◉ How would you remove moisture from refrigerant in a system
Answer: Use a filter drier
◉ Which of the following statements about "self contained"
recovery devices is true
