WorksheetsEPA 608 Review -- CORE pt 2 (English)
Total questions: 30
Worksheet time: 15mins
What type of refrigerant technologies can only be used in new equipment?
Low-pressure refrigerants
Flammable refrigerants
Mineral oil-based refrigerants
CFC-12 refrigerants
Which synthetic oil is emerging alongside polyolester oil?
Mineral oil
Alkylbenzene oil
Polyvinyl ether (PVE) oil
CFC-12
What is the effect of superheating the refrigerant before it enters the compressor?
It ensures no liquid refrigerant is present
It increases the refrigerant's density
It decreases the refrigerant's pressure
It solidifies the refrigerant
What is the effect of the throttling device on the refrigerant?
It increases the refrigerant's pressure
It decreases the refrigerant's pressure and saturation temperature
It heats the refrigerant
It converts the refrigerant to a gas
What is the function of an expansion valve in a refrigeration system?
To increase the pressure of the refrigerant
To drop the pressure and allow the refrigerant to evaporate
To change the refrigerant into a liquid
To circulate air within a room
What is a vapor-compression cycle?
A cycle where refrigerant is compressed and cooled.
A cycle where refrigerant is only heated.
A cycle that does not involve refrigerant.
A cycle that only involves cooling.
What is the psig equivalent of 14.7 psia?
0 psig
14.7 psig
29.4 psig
7.35 psig
How do you convert psig to psia?
Add 14.7 to the psig reading
Subtract 14.7 from the psig reading
Multiply the psig reading by 14.7
Divide the psig reading by 14.7
What is the reading in microns for 0.0 psia?
0 microns
125,000 microns
252,000 microns
379,000 microns
What is the reading in microns for 0.5 psia?
25,000 microns
125,000 microns
252,000 microns
379,000 microns
What is the typical color of the low-pressure compound gauge in a manifold gauge set?
Red
Blue
Yellow
Green
What is the function of a rotating shaft seal in an open-drive compressor?
To completely seal the compressor
To prevent refrigerant from leaking to the outside
To increase the efficiency of the compressor
To reduce noise during operation
Why should hermetic compressors not be operated in a vacuum?
They overheat due to lack of refrigerant flow.
They consume too much power.
They produce excessive noise.
They require constant maintenance.
What can result from operating a hermetic compressor in a vacuum?
Increased efficiency
System compressor burnout
Reduced noise levels
Improved cooling performance
What do high-pressure gauges in the United States measure in?
Inches of mercury
Kilopascals
Pounds per square inch gauge (psig)
Bars
What is the chemical type of R-502?
CFC
HCFC
HFC
PFC
Which refrigerant replaces R-12?
R-123
R-134a
R-404A
R-407C
What components are found in R-410A?
R-22, 152a
R-125, R-143a, R-134a
R-32, R-125
R-12, 152a
What is the chemical type of R-404A?
CFC
HCFC
HFC
PFC
Which refrigerant is used for commercial air conditioning?
R-11
R-12
R-500
R-502
What is the liquid phase saturation pressure range for Medium-pressure appliances (Type II)?
Below 45 psia
Between 45 psia and 170 psia
Between 170 psia and 355 psia
Above 355 psia
Which standard is used for testing recovery and recycling equipment according to the EPA?
AHRI Standard 740
ISO Standard 9001
ANSI Standard 500
EPA Standard 101
Why is it difficult to determine the refrigerant when non-condensable gases are present?
They lower the system pressure.
They raise the system pressure.
They stabilize the system pressure.
They have no effect on the system pressure.
What should you do if you are unsure of the refrigerant in the system?
Use any available refrigerant.
Recover the refrigerant into a dedicated recovery cylinder.
Ignore the issue and continue using the system.
Replace the entire system.
What is the best practice if the system has no name plate for reference?
Guess the refrigerant type.
Contact the equipment manufacturer.
Use a random refrigerant.
Ignore the issue.
What is one action you can take after recovering refrigerant from equipment?
Burn the refrigerant.
Return it to the same system.
Mix it with other chemicals.
Discard it in the trash.
What is one thing you cannot do with recovered refrigerant?
Transfer ownership without selling.
Recycle it.
Reclaim it.
Return it to the same system.
What should be done to check for contaminants in larger systems?
Ignore the issue
Use a pressure regulator
Take an oil sample
Use liquid refrigerant
What is the pressure (PSIG) for R-134a at 100°F?
123.5
113.3
103.8
94.8
Why is push–pull recovery typically faster than vapor recovery?
It uses less energy
It involves oil separation
Oil flows with the liquid refrigerant
It requires no equipment
