EPA 608 Core
To scrap a disposable cylinder, the internal cylinder pressure should be reduced to at least:
0 psig
The high pressure gauge on service manifold sets has a continuous scale, usually calibrated to read from:
0 to 500 psi.
It is necessary to place a refrigerant label on:
A refrigerant cylinder which is being returned for reclaiming.
The Montreal Protocol is:
A treaty among nations that controls production of CFC's and HCFC's.
Under EPA's regulation, what standard must reclaimed refrigerant meet before it can be resold?
ARI 700
Recycling and recovery equipment intended for use with air conditioning and refrigeration equipment (except for small appliance) must be tested under:
ARI-740
Which of the following is an approved "drop in" service replacement for R-12?
According to the EPA there are no "drop in" replacements.
The synthetic lubricant presently used with ternary blends containing HCFC is:
Alkylbenzene.
Never use an open flame to heat a refrigerant tank because:
All of the above
Which of the following statements would be considered good service practices for conserving refrigerant?
All of the above
R-410a is not a typical blended refrigerant because:
All of the above is true.
Data shows that chlorine in the stratosphere comes mainly from CFCs rather than from natural sources such as volcanoes because:
All of the above,.
According the EPA, when dealing with customer complaints regarding additional costs due to refrigerant recovery efforts, the technician should:
All of the above.
Long hoses between the unit and the recovery machine should not be used because they cause:
All of the above.
Refrigeration technicians who violate the Clean Air Act can:
All of the above.
The Clean Air Act;
All of the above.
The recovery of refrigerants is necessary to:
All of the above.
When operating refrigerant recovery or recycling equipment, the following precautions should always be followed:
All of the above.
When using recovery unit, the fill level of the recovery tank can be controlled by:
All of the above.
Which safety precautions should always be followed?
All of the above.
Which refrigerants must be recovered before opening a system or disposing of a system?
All refrigerants must be recovered.
All recovery equipment currently being made is required to have:
An EPA approved certification label.
Use ____________ to remove ice from a sight glass.
An alcohol spray.
HCFC refrigerants:
Are less harmful to stratospheric ozone than CFCs.
In general, blended refrigerants should be charged:
As a liquid.
The proper method of discarding a disposable refrigerant cylinder is to:
Assure that all refrigerant is recovered and that the cylinder is rendered useless, than recycle the metal.
When transporting cylinders containing used refrigerant, the DOT requires that you:
Attach DOT classification tags
Manifold gauge sets are often color coded, when this is done, the low pressure gauge is color coded?
Blue.
State and local governments can make state laws that:
Both A & B.
Which type of refrigerant is the most harmful to stratospheric ozone?
CFC
Which chemicals are controlled by the Montreal Protocol?
CFCs, HCFCs and halons (all of the above)
Of the refrigerants listed below, which refrigerant type have the highest ozone depletion potential?
CFCs.
"Self contained" recovery device:
Can capture liquid and/or vapor refrigerant without the assistance of components in the air conditioning or refrigeration equipment.
Even though R-22 is considered non toxic, it:
Can cause asphyxia.
What is being done in the U.S. to stop damage to the stratospheric ozone layer?
Capturing and ultimately eliminating use of CFC.
When using nitrogen to pressurize a system, you should always:
Charge through a pressure regulator.
This chemical was found in the upper stratosphere and that indicates that the ozone layer is being destroyed:
Chlorine monoxide
Which atom of the CFC molecule cause ozone depletion?
Chlorine.
In a refrigeration system, the device that changes a low pressure vapor to a high pressure vapor is the?
Compressor.
In a refrigeration system, high pressure vapor is converted to high pressure liquid in the:
Condenser.
The evacuation of a system is a method of?
Dehydration.
The over-evacuation of a system:
Does not occur.
Which gas(es) would cause the LEAST damage to the environment during a leak check?
Dry nitrogen
When evacuating a system, the hoses should be:
Equal to or larger than vacuum pump inlet connection.
The type of oil that is most commonly used in stationary refrigeration applications with HFC-134a is?
Ester oil.
Under the EPA "safe disposal requirements", the person responsible for making sure that the refrigerant has been removed from household refrigerators before they are disposed of is the:
Final person in the disposal chain.
According the EPA regulations, which of the following is procedures is not an approved technique for system cleanup after a burnout?
Flushing with liquid refrigerant to clean tubing.
Of the refrigerant listed below, which types of refrigerants will not damage stratospheric ozone?
HFCs
Which type of refrigeration are chlorine free?
HFCs
Personal protective equipment should always be worn is when:
Handling and filling refrigerant cylinders.
Refrigerant can not be called "reclaimed" unless it:
Has been chemically analyzed and the refrigerant meets the ARI-700 purity standard.
HCFC refrigerants contain:
Hydrogen, chlorine, fluorine, carbon.
HFC refrigerants contain:
Hydrogen, fluorine, carbon.
Non-Azeotropic refrigerants leak from a system:
In uneven amounts due to different vapor pressure.
What statement is true about an azeotropic refrigerant mixture?
It is a mixture that acts like a single component refrigerant over its entire range.
It is illegal to:
Knowingly release any refrigerant during the service, maintenance, repair or disposal of appliances, with the exception of de minimis releases.
Refrigerant that enters the compressor, under normal operating conditions, is a:
Low pressure vapor.
When using with any solvent, cleaner, chemical or refrigerant, you should review:
Material safety data sheets.
Ozone in the stratospghere above the earth consists of:
Molecule of 3 oxygen atoms.
When can you use a disposable cylinder to recover refrigerant:
Never.
Ester based oils cann be mixed with:
No other oils.
It has been illegal to vent substitutes for CFC and HCFC refrigerants since:
November 1995.
When using nitrogen to pressurize a system, you should:
Only charge with nitrogen vapor.
We dealing with small systems, how many different refrigerants may be recovered into the same cylinder?
Only one.
A compound pressure gauge, typically used on the low side of the system, measures pressure in?
Psig and inches of mercury.
Which refrigerant listed below is a "low pressure refrigerant" under EPA's refrigerant recycling regulation?
R-123.
Of the refrigerants listed below, which has the lowest ozone depletion potential?
R-134a
An example of a HFC refrigerant is:
R-134a.
An example of an HFC refrigerant is:
R-134a.
Of the refrigerants listed below, which has the lowest ozone depletion potential?
R-22
Which refrigerant is an HCFC?
R-22
Which refrigerant contains an HCFC?
R-22.
An example of a HFC refrigerant is:
R410a
If an oil is hygroscopic it means that it?
Readily absorbs moisture.
If a technician has a system where some R-502 was added to an R-22 system. The technician should:
Recover all the refrigerant into a separate tank.
Before you dispose of any system containing a refrigerant, you must:
Recover the refrigerant.
A cylinder with a gray body and a yellow top indicates that the cylinder is designed to hold:
Recovered refrigerant.
_______________ is the process of removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in any way.
Recovering.
Manifold gauge sets are often color coded, when this is done, the high pressure gauge is color coded:
Red.
In a vapor compression refrigeration system, cooling occurs when:
Refrigerant liquid turns to a vapor.
Which type of refrigerant is the most harmful to stratospheric ozone?
Refrigerants containing Bromine.
A system is dehydrated to:
Remove water and water vapor.
The EPA can require a technician to demonstrate their ability to perform proper procedures for recovering and/or recycling refrigerant. Failure to demonstrate competency can result in:
Revocation of the technician's certification.
Recovery equipment that relies upon the compressor in the system would be considered:
System-dependent.
Recovery equipment that relies upon the pressure of the refrigerant in the appliance would be considered:
System-dependent.
The term used to describe the fact that a refrigerant blend has a range of boiling or condensing points at a constant Pressure is?
Temperature glide.
Never overfill refrigerant storage cylinders because:
The internal pressure of the cylinders may rise in heated areas and cause an explosion.
It is important not to mix R-22 and R-410a refrigerants in the same container because:
The mixture may be impossible to reclaim.
An example of an HCFC refrigerant is:
r-22
Refrigerant that is recovered can be returned to:
The same system or other systems owned by the same person without restriction.
According to the EPA, an oil sample should be taken for which of the following reasons?
The system had a leak or a major component failure.
Measuring the system's final vacuum is always done with:
The system isolated and the vacuum pump off.
A hermetic compressor must never be operated when:
There is a dehydration vacuum in the system.
Refrigerant vapors or mist should not be inhaled because:
They may cause heart irregularities and/or unconsciousness.
CFCs and HCFCs have which of the following in common?
They must be recovered before opening or disposing of appliances.
A ternary refrigerant blend is a ___________ part mixture.
Three part.
Refrigerant migrates to the compressor crankcase because of a difference in ______________ between the refrigerant and the oil.
Vapor pressure.
Disposable refrigerant containers are used for ________ refrigerant.
Virgin.
Never use oxygen or compressed air to pressurize a system because:
When mixed with compressor oil or some refrigerants, it could explode.
Technicians receiving a passing grade on the Tyupe II (medium-pressure, high-pressure equipment and very high pressure refrigerants, including:
With Type II certification, you are certified for all very high pressure refrigerants including CFC-13 and CFC-503