WorksheetsEPA 608 Review -- CORE pt 3
Total questions: 30
Worksheet time: 15mins
What could happen if a cylinder is overfilled and the temperature rises?
The cylinder will shrink
The refrigerant will freeze
The cylinder could vent or explode
The refrigerant will evaporate
What must cylinders exceeding 4.5" in diameter or 12" in length have?
A thermometer
A pressure-relief device
A magnetic-reed float valve
A sight glass
What should never be used with an R-410A condensing unit?
R-22 air handler
R-410A air handler
Copper tubing
Flushing solution
What is the purpose of flushing the tubing with nitrogen before using a flushing solution?
To cool the system
To remove loose contaminants
To increase pressure
To add moisture
What can R-12 and R-22 decompose into at high temperatures?
Oxygen and nitrogen
Hydrochloric and hydrofluoric acids
Water and carbon dioxide
Methane and ethane
What should be done if a recovery cylinder contains R-502 added to an R-22 system?
Recover the refrigerant into the same cylinder
Recover the refrigerant into a separate recovery cylinder
Mix it with another refrigerant
Use it as is
What is the purpose of replacing the liquid-line filter drier and adding a suction-line filter drier?
To increase the system's pressure
To improve the system's cooling efficiency
To remove contaminants from the system
To reduce the system's noise levels
What can transform oil into a sludge-like molasses in a system?
Excess refrigerant
High pressure
Particulates, acid, and mineral oil
Low temperature
What is the purpose of a manifold gauge set in a refrigeration system?
To measure the temperature of the refrigerant
To connect the low and high-pressure sides of the system
To filter impurities from the refrigerant
To increase the pressure of the refrigerant
What is a recommended practice when selecting hoses for a manifold gauge set?
Use the longest hoses available
Use the largest diameter and shortest hoses available
Use hoses with the smallest diameter
Use hoses with multiple valves
Why should long hoses be avoided between the unit and the recovery machine?
They are more expensive
They cause excessive pressure drop
They are difficult to handle
They are prone to leaks
What should be removed from hoses to ensure efficient operation?
Extra valves
Schrader valve core depressors
Additional fittings
Pressure gauges
What is the purpose of crimping the exterior end of the line-set?
To decrease the residence time
To increase the residence time
To allow for easier brazing
To reduce the need for nitrogen
Where should a waste container be placed during the purging process?
At the indoor end of the line set
At the outdoor end of the line set
Near the nitrogen source
Next to the flushing agent container
What is the purpose of breaking the evacuation vacuum in a system?
To introduce moisture into the system
To stabilize the system at atmospheric pressure
To remove all traces of refrigerant
To increase the system's temperature
What is the purpose of using hoses with larger fittings in larger systems?
To increase the temperature
To reduce pressure drop and speed up recovery rates
To decrease the size of the system
To increase the weight of the system
How often must reusable containers for refrigerants be hydrostatically tested?
Every 2 years
Every 3 years
Every 5 years
Every 10 years
What should you do if the test date stamped on a recovery cylinder is more than five years ago?
Use it immediately
Discard it
Have it retested
Paint over the date
What is a drawback of using dye indicators for leak detection?
They are too expensive
They can stain tools, equipment, and furnishings
They require special training
They are not accurate
What happens when an electronic leak detector detects refrigerant?
It changes color
It makes a sound or lights up
It vibrates
It shuts down
What does an electronic leak detector use to draw air into the leak tester probe?
A small air pump
A vacuum
A fan
A compressor
What should be done with a non-hazardous flushing agent after use?
Dispose of it down the drain
Dispose of it with waste refrigerant oil
Store it indefinitely
Burn it
What is the maximum pressure relief valve setting for low-pressure systems?
10 psig
15 psig
20 psig
25 psig
What is used to remove moisture from the system between evacuations in the triple evacuation method?
Oxygen
Hydrogen
Nitrogen
Helium
What is the pressure in microns at 85°F according to Table C-13?
31,000 microns
36,000 microns
42,000 microns
49,000 microns
What tool is necessary to avoid over-pressurization when using dry nitrogen from a portable cylinder?
Vacuum pump
Pressure regulator
Micron vacuum gauge
Gas ballast valve
What happens if you forget to close the gas ballast valve?
The vacuum will be deeper
A deep vacuum won’t be achieved
The pump will stop
The system will overheat
What is the ideal location to connect your vacuum gauge for the most accurate readings during system evacuation?
Directly on the vacuum pump
As far as possible from the system
Close to the system to be evacuated
On the exhaust port
What is the maximum acceptable vacuum gauge reading after waiting during the evacuation process?
1000 microns
750 microns
500 microns
250 microns
What can be done to decrease dehydration time during the dehydration of a refrigeration system?
Cool the system.
Heat the system.
Increase the system pressure.
Use longer vacuum lines.
