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WorksheetsEPA 608 Exam Study Type III
Total questions: 25
Worksheet time: 13mins
ASHRAE Standard 15-2013 requires the use of room sensors and alarms to detect?
A1 refrigerants
B2 refrigerants
A2 refrigerant
all refrigerant safety groups
Which of the following statements is true of recycling and recovery equipment?
it must be tested by an AHRI-approved third party
it must be equipped with low loss ball valves and flare fittings
it must be able to handle more than one refrigerant
it must be labeled as certified to meet EPA's requirements.
Which of the following methods can be used to pressurize an R-1233zd system for the purpose of opening the system for a non-major repair?
adding nitrogen to the system
warming the liquid refrigerant in the system
adding compressed air to the system's condenser
adding carbon dioxide to the system's condenser and evaporator
When should an appliance NOT be evacuated all the way to the prescribed level?
when performing a major repair followed by a minor repair
when the repair is followed by an evacuation of the appliance to the environment
when leaks in the appliance make evacuation to the prescribed level unattainable
when the appliance is being disposed of
What must be done after recovering the liquid refrigerant from a low-pressure chiller?
recover the vapor refrigerant
pressurize the system with nitrogen
separate the oil from the system
solvent flush the entire system
What should you do after reaching the required recovery vacuum on a low-pressure appliance?
immediately disconnect the recycling or recovery equipment and open the system for service
wait for at least a few minutes to see if the system pressure rises before charging
break the vacuum with nitrogen and open the system for service to begin charging liquid
pressurize the system with nitrogen and perform a leak check
R-123 at 14.7 PSIA will boil at approximately?
90°F
82°F
78°F
74°F
Approximately how much refrigerant vapor is left in an average 350-ton R-123 chiller at 0 PSIG once all the R-123 liquid has been removed?
trace amount
50 lbs
75 lbs
100 lbs
When leak testing a low pressure centrifugal with nitrogen, what is the maximum test pressure?
0 PSIG
10 PSIG
25 PSIG
50 PSIG
What is the primary purpose of a purge unit on a low-pressure chiller?
remove refrigerant from the system
condense air out of the system
condense water out of the system
remove non-condensables from the system
What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?
leak test and repair the chiller.
seal the purge unit discharge line.
pipe purge unit back into the low side.
pipe purge unit back into recovery unit.
Who is responsible for keeping records of all leak inspections and any completed leak repair verification tests?
The original installing technician's employers
Only the technician that has actually performed each inspection or verification test
The owner and/or operator of the equipment
The EPA leak rate assessment division
Starting in 2019, EPA regulations require that all chillers containing 50 or more pounds of ozone-depleting refrigerant that are used for comfort cooling be repaired when the leak rate exceeds
5% of the charge per year
10% of the charge per year
20% of the charge per year
30% of the charge per year
A hydrostatic tube test kit will;
determine if a tube leaks
blow all water out of tubes
remove water from a machine
vent refrigerant to the atmosphere
Refrigerant removal from a low-pressure system starts with;
vapor removal
liquid removal
vapor and liquid removal
oil separation
A typical setting for the high pressure cut-out control on a recovery unit used for evacuating the refrigerant from a low-pressure chiller is;
2 PSIG
5 PSIG
10 PSIG
15 PSIG
How long must a technician evacuating refrigerant from appliances with a full charge of more than 5 pounds and less than 50 pounds that are being disposed of keep records of the event?
1 year
3 years
5 years
10 years
Where does the purge unit on a centrifugal system takes its suction?
top of the condenser
compressor oil sump
top of the evaporator
suction elbow
What is the best method to determine a chiller's normal charge for leak rate calculations?
determine from the maximum power consumption.
determine from the compressor horsepower.
determine from the dimensions of the chiller barrels.
use the charge stated on the equipment nameplate.
ASHRAE Standard 15-2013 requires the use of room sensors and alarms to detect;
refrigerant leaks
high levels of ozone
refrigerant contamination
excessive oxygen level
When evacuating a system, the use of a severely over-sized vacuum pump could?
cause trapped oil to freeze
cause trapped refrigerant to freeze
cause trapped water to freeze
cause the valves to freeze
Charged low pressure refrigeration machines may be most efficiently leak checked by;
adding dry nitrogen
adding HCFC 22
raising system pressure by heating with circulated hot water or heating blankets
operating the purge system
After system servicing, and recharging, why is refrigerant vapor re-introduced to the chiller before refrigerant liquid?
vapor charging increases pressure slowly, preventing failure of the rupture disk
vapor charging is faster than liquid charging
liquid charging is more difficult to control than vapor charging
liquid charged into a deep vacuum will boil and may lower temperatures enough to freeze water in the tubes
Which of the following actions would ALWAYS be considered "major" under EPA's regulations?
replacement of an evaporator coil
replacement of a filter-drier
replacement of a switch
replacement of a purge unit
Where does refrigerant go after it leaves the purge unit of a low pressure centrifugal system?
the evaporator
the condensor
the compressor intercooler
the recovery service vessel
