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________ is the process that returns refrigerant to new-product specifications and that requires chemical analysis?
  1. recovery
  2. recycle
  3. reclaim
  4. reprocess
    1.  reclaim


Disposable refrigerant containers are used for _______ refrigerant.
  1. recycled
  2. recovered
  3. virgin
  4. both 1 and 2
  1. virgin
According to the EPA, an oil sample should be taken for which of the following reasons?
  1. A new filter-drier has been installed.
  2. The system had a leak or a major component failure.
  3. The system is not cooling properly.
  4. Recycled refrigerant was added to the system.
  1. The system had a leak or a major component failure.
Ozone depletion in the stratosphere is what type of problem?
  1. American
  2. Third World
  3. National
  4. Global
  1. Global
A hermetic compressor must never be operated when:
  1. the compressor is operating under light load.
  2. he compressor is operating under full load.
  3. there is a dehydration vacuum in the system.
  4. the outdoor temperature is above 125F.
  1. there is a dehydration vacuum in the system.
You can determine safe pressure for leak testing a system from the:
  1. low-side test-pressure data-plate value.
  2. discharge operating pressure.
  3. ambient +30 degree temperature/pressure value
  4. ambient at standby condition.
  1. low-side test-pressure data-plate value.
CFC refrigerants are so named because they contain the elements:
  1. chlorine, fluorine, carbon
  2. chlorine, fluorine, calcium
  3. carbon, fluoride, calcium
  4. chlorine, fluorine, hydrogen
  1. chlorine, fluorine, carbon
What factor(s) affects the speed of evacuation?
  1. the size of the equipment being evacuated.
  2. the ambient temperature.
  3. the amount of moisture in the system.
  4. all of the above.
  1. all of the above.
Which gas(es) would cause the LEAST damage to the environment during a leak check?
  1. dry nitrogen and R-22
  2. dry nitrogen and R-12
  3. compressed air and R-12
  4. dry nitrogen
  1. dry nitrogen
Which refrigerant contains a CFC?
  1. R-12
  2. R-22
  3. R-134a
  4. R-410A
  1. R-12
Of the refrigerants listed below, which refrigerant type have the highest ozone depletion potential?
  1. HCFCs
  2. HFCs
  3. CFCs
  4. All are equal
  1. CFCs
What statement is true about an azeotropic refrigerant mixture?
  1. It is always make from just two components.
  2. It has a pressure-temperature curve identical to one of its components.
  3. It is a mixture that is always made from at least three component refrigerants.
  4. It is a mixture that acts like a single-component refrigerant over its entire range.
  1. component refrigerant over its entire range.
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:
  1. final person in the disposal chain
  2. service technician worked on the equipment last
  3. the manager of the service company that last serviced the equipment
  4. the EPA field inspectors
  1. final person in the disposal chain
Which refrigerant is an HCFC?
  1. R-123
  2. R-134a
  3. R-410A
  4. R-12
  1. R-123
Refrigerant can not be called "reclaimed" unless it:
  1. was processed in a reclaiming machine.
  2. has been chemically analyzed and the refrigerant meets the ARI-700 purity standard.
  3. is recovered from a system less than 1 year old.
  4. is recovered from a system still under warranty.
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  1. has been chemically analyzed and the refrigerant meets the ARI-700 purity standard.
Reusable refrigerant containers that are normally under any pressure above 15 psig, must be hydrostatically tested and date stamped every:
  1. 1 year
  2. 2 years
  3. 3 years
  4. 5 years
  1. 5 years
To obtain an accurate vacuum readings during system evacuation, the system vacuum gauge should be located:
  1. at the pump discharge.
  2. as far from the vacuum pump as possible.
  3. directly at the pump suction.
  4. anywhere in the evacuation service hose.
  1. as far from the vacuum pump as possible.
Use __________ to remove ice from a sight glass.
  1. an alcohol spray
  2. water
  3. R-11 refrigerant
  4. a screw driver or flat file
  1. an alcohol spray
The ozone layer protects the earth from:
  1. nuclear radiation.
  2. infrared radiation.
  3. ultraviolet radiation from the sun.
  4. bacteria from space.
  1. ultraviolet radiation from the sun.
Manifold gauge sets are often color coded, when this is done, the low pressure gauge is color coded:
  1. red.
  2. white.
  3. blue.
  4. yellow.
  1. blue.
This chemical was found in the upper stratosphere and that indicates that the ozone layer is being destroyed.
  1. chlorine monoxide
  2. carbon monoxide
  3. carbon dioxide
  4. nitrogen dioxide
  1. chlorine monoxide
Which chemicals are controlled by the Montreal Protocol?
  1. chlorofluorocarbons
  2. hydrochlorofluorocarbons
  3. halons
  4. all of the above
  1. all of the above
An award of up to what amount may be paid to a person supplying information that leads to a penalty against a technician who is intentionally venting?
  1. $5,000
  2. $10,000
  3. $27,00
  4. $37,000
  1. $10,000
Which type of refrigerant is the most harmful to stratospheric ozone?
  1. CFC
  2. HCFC
  3. HFC
  4. Ammonia
  1. CFC
The evacuation of a system is a method of:
  1. pinpointing the location of leaks.
  2. acid removal.
  3. dehydration.
  4. all of the above
  1. dehydration.
A ternary refrigerant blend is a ____ part mixture.
  1. two-part
  2. three-part
  3. four-part
  4. five-part
  1. three-part
The over-evacuation of a system:
  1. can cause tube, condenser and/or evaporator collapse.
  2. damages vacuum gauge sets.
  3. causes vacuum pump damage.
  4. does not occur.
  1. does not occur. 
Of the refrigerants listed below, which has the lowest ozone depletion potential?
  1. R-22
  2. R-123
  3. R-134a
  4. R-502
  1. R-134a
When dehydrating a system, the system can be heated to:
  • avoid oxidation
  • increase the oil's viscosity.
  • decrease the dehydration time.
  • increase the dehydration time.
  • decrease the dehydration time.
The Clean Air Act:
  • sets a schedule for the phase out of CFC/HCFC production.
  • prohibits venting of refrigerants.
  • authorizes the EPA to set standards for recovery of refrigerants.
  • all of the above
  • all of the above 
Which of the following is a "very high-pressure refrigerant" under EPA's refrigerant recycling regulations?
  • R-22
  • R-134a
  • R-13
  • R-500

  • R-13
Of the refrigerants listed below, which has the lowest ozone depletion potential?
  • R-22
  • R-11
  • R-12
  • R-113

  • R-22
The EPA requires the installation of a service aperture or process stub on all appliances using a class I or class II substance as a refrigerant. The main purpose of this requirement is to make it easier to:
  • recover refrigerant.
  • change the compressor lubrication.
  • vent non-condensables.
  • dehydrate the system.

  • recover refrigerant. 
When using with any solvent, cleaner, chemical or refrigerant, you should review:
  • moisture solubility information.
  • chemical compound reference sheets.
  • material safety data sheets.
  • chemical composition reference sheets.

  • material safety data sheets. 
A system is dehydrated to:
  • remove oil and oil vapor.
  • remove water and water vapor.
  • remove refrigerant and refrigerant vapor.
  • none of the above

  • remove water and water vapor. 
Which refrigerant is an HCFC?
  • R-124
  • R-134a
  • R-410A
  • R-12

  • R-124
CFCs will no longer be manufactured or imported into the United States after:
  • 1994
  • 1995
  • 1996
  • 1997

  • 1995
It has been illegal to vent substitutes for CFC and HCFC refrigerants since:
  • June 1, 1992
  • July 15, 1993
  • November 1993.
  • November 1995.

  • November 1995.
Equipment covered by EPA regulations include:
  • only refrigerators and freezers using CFC's.
  • only air-conditioning and refrigeration equipment containing and using HCFC refrigerants.
  • all air-conditioning and refrigeration equipment using CFC, HCFC or HFC refrigerants.
  • only commercial air-conditioning and refrigeration equipment made in the USA.

  • all air-conditioning and refrigeration equipment using CFC, HCFC or HFC refrigerants.
All devices used for refrigerant recovery must:
  • be portable and weigh less than 100 pounds.
  • contain a heavy-duty ozone shield.
  • have a 5 Ton-refrigeration rating at 100F.
  • meet EPA standards.
  • meet EPA standards. 
A cylinder with a gray body and a yellow top indicates that the cylinder is designed to hold:
  • nitrogen.
  • inert gas
  • only R-12.
  • recovered refrigerant.

  • recovered refrigerant. 
Refrigerant migrates to the compressor crankcase because of a difference in __________ between the refrigerant and the oil.
  • vapor pressure
  • acidity
  • volume
  • density

  • vapor pressure
What characteristic(s) of CFCs make them more likely to reach the stratosphere than most other compounds containing chlorine?
  • Refrigerants that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere after being released. The chlorine or bromine reacts with ozone, causing it to change back to oxygen, thus destroying the ozone layer.
  • CFCs are lighter than other damaging compounds, making it easier for them to float upward when released.
  • CFCs are attracted to the static in the atmosphere.
  • CFCs are attracted to dust in the atmosphere.

  • Refrigerants that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere after being released. The chlorine or bromine reacts with ozone, causing it to change back to oxygen, thus destroying the ozone layer. 
The type of oil that is most commonly used in stationary air conditioning applications with HFC-410A refrigerant is:
  • ester oil
  • alkylbenzene oil.
  • mineral oil.
  • all oils are compatible with HFC-410A.

  • ester oil
Non-Azeotropic refrigerants leak from a system:
  • faster than other refrigerants.
  • in uneven amounts due to different vapor pressures.
  • slower than other refrigerants.
  • only if the joint fails completely.

  • in uneven amounts due to different vapor pressures. 
Personal protective equipment (gloves, safety glasses, safety shoes, etc.) should always be worn is when:
  • reporting for work.
  • handling and filling refrigerant cylinders.
  • climbing ladders.
  • lifting

  • handling and filling refrigerant cylinders.
Data shows that chlorine in the stratosphere comes mainly from CFCs rather than from natural sources such as volcanoes because:
  • The rise in the amount of chlorine in the stratosphere matches the rise in the amount of fluorine, which has different natural sources than chlorine.
  • The rise in the amount of chlorine in the stratosphere matches the rise in CFC emissions.
  • Air samples taken from the stratosphere over erupting volcanoes show that volcanoes contribute a small quantity of chlorine to the stratosphere when compared to CFCs.
  • All of the above

  • All of the above
Recycling and recovery equipment intended for use with air-conditioning and refrigeration equipment (except for small appliances) must be tested under:
  • ARI 700
  • ARI 740
  • EPA 700
  • UL 740

  • ARI 740
HFC refrigerants contain:
  • helium, fluorine, carbon
  • helium, fluorine, calcium.
  • hydrogen, fluorine, chlorine.
  • hydrogen, fluorine, carbon.

  • helium, fluorine, carbon 
To determine the maximum allowable pressure to use when checking a system, check:
  • with the equipment owner.
  • with the refrigerant pressure/temperature tables.
  • the design pressure on the equipment nameplate
  • ask the local utility company.

  • the design pressure on the equipment nameplate 
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