EPA Test

How does the global warming potential of R-410A compare to carbon dioxide? a) It is lower b) They are equal c) It is hundreds of times greater d) It is thousands of times greater

D

Which refrigerant does NOT contain chloride? a) R-134a b) R-12 c) R-22 d) R-124

a

Which type of refrigerant is the most harmful to stratospheric ozone? a) CFCs b) HCFs c) HFCs d) HFOs

a

What must the concentration of the flammable refrigerant in air be for a flammable refrigerant to burn or explode? a) Only above the Lower Flammability Limit b) Only below the Upper Flammability Limit c) At any concentration below the Flammability Limit or above the Upper Flammability Limit d) At any concentration above the Lower Flammability Limit and below the Upper Flammability Limit

a) Only above the Lower Flammability Limit

What must be done before shipping any used refrigerant in a cylinder? a) Properly label the refrigerant container b) Fill the cylinder to capacity c) Check that the recipient is Section 608 certified to recycle refrigerant d) Pressure check the refrigerant

a) Properly label the refrigerant container

Which of the following is an approved refrigerant for new household refrigerators, freezers, and combination refrigeration/freezers? a) R-600a b) R-1234yf c) R-1234zd d) R-170

a) R-600a

Recovery equipment that relies on the compressor in the appliance and/or the pressure of the refrigerant in the appliance is considered? a) System-dependent b) Self-contained c) A packaged terminal unit d) Self-sufficient

a) System-dependent

What is the name of EPA's program that identifies refrigerants with lower overall risks to human health and the environment? a) The Significant New Alternatives Policy (SNAP) Program b) The GreenChill Program c) The Approved ASHRAE List (AAL) d) Energy Star

a) The Significant New Alternatives Policy (SNAP) Program

Which of the following best describes low loss fittings on refrigerant recovery devices used to recover CFCs, HCFCs, and HFCs? a) They can be either manually closed or automatically closed when disconnected to prevent loss of refrigerant from hoses b) They are used to connect the recovery device to an appliance and leak only small amounts of refrigerant during use c) They are used to connect the recovery device to an appliance and must be discarded after each use d) They eliminate oil loss during recovery

a) They can be either manually closed or automatically closed when disconnected to prevent loss of refrigerant from hose

Why should long hoses between the unit and the recovery machine be avoided? a) They cause excessive pressure drop and increased recovery time b) They increase pressure and recovery time c) They decrease emissions and recovery time d) They cause excessive temperature rises, with decreasing pressures that can lead to seal failure

a) They cause excessive pressure drop and increased recovery time

Why do EPA regulations require appliances to have a service aperture or process stub? a) To make it easier to recover refrigerant b) To check for open motor windings c) To vent non-condensibles d) To dehydrate the system oil

a) To make it easier to recover refrigerant

When R-410A is recovered from an appliance, it..? a) can be mixed with either R-32 or R-125 during the recovery process, since R-410A is a mixture of those two refrigerants b) can be mixed with R-134a but not R-22 during the recovery process c) need not be recovered since R-410A is not one of the refrigerants covered by the Clean Air Act d) should be recovered into a recovery vessel that is clearly marked to ensure that mixing of refrigerants does not occur

a) can be mixed with either R-32 or R-125 during the recovery process, since R-410A is a mixture of those two refrigerants

Any person who opens an appliance containing a CFC, HCFC, or HFC for maintenance, service, or repair must have at least one self-contained recovery machine available for use. The exception to this rules are persons working on..? a) small appliances b) low-pressure appliances c) high-pressure appliances d) very high-pressure appliances

a) small appliances

Which of the following statements is true? a) There is no difference between refrigerant grade hydrocarbon refrigerant and propane for grills. b) Propane cylinders for grilling contain impurities that can damage refrigeration equipment. c) Refrigerant-grade hydrocarbon refrigerant is of lower quality than consumer propane cylinders. d) Hydrocarbon refrigerants can be used as a retrofit refrigerant.

b

What is a ternary blend refrigerant? a) A two-part mixture b) A three-part mixture c) A four-part mixture d) A five-part mixture

b) A three-part mixture

Which hydrocarbon refrigerant is approved for retrofit into existing household refrigerators? a) HC R-600a 2 ounces or less b) Blended HC R-441A c) HC R-290 1 lb. or less d) Hydrocarbons are not approved for retrofit applications

b) Blended HC R-441A

Which of the following is required when attaching a gauge set to check system pressures? a) Release a small amount of refrigerant to check for contamination b) Have manual or self-sealing valves on the ends of the gauges set hoses to minimize any release of refrigerant c) Recover refrigerant and recharge to specifications even if no repairs are needed d) Use hoses that are 3 feet or longer

b) Have manual or self-sealing valves on the ends of the gauges set hoses to minimize any release of refrigerant

What gases can CFC and HCFC refrigerants decompose into at high temperatures, (e.g., open flames, glowing metal surfaces, etc.)? a) Hydrazine gas b) Phosgene gas c) Helium gas d) Tetraethyl gas

b) Phosgene gas

Equipment which is used to recover CFC, HCFC, and HFC refrigerant from small appliances for the purpose of disposal must meet what standard? a) Recover 95% or the refrigerant whether or not the compressor is operative b) Recover 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with an operative compressor c) Recover 90% of the refrigerant with an inoperative compressor and 80% of the refrigerant with an operative compressor d) Recover 75% of the refrigerant within 5 minutes

b) Recover 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with an operative compressor

For an appliance that uses a CFC, HCFC, or HFC refrigerant, which of the following violates the prohibition on venting? a) Accidental releases associated with timely repair of an appliance b) Refrigerants emitted when cutting a line without properly evacuating the appliance c) Refrigerants emitted in a catastrophic failure of an appliance d) Refrigerants emitted when connecting or disconnecting low loss hoses to charge or service an appliance

b) Refrigerants emitted when cutting a line without properly evacuating the appliance

Why should the technician watch for signs of contamination in the oil when recovering refrigerant from a system that experienced a compressor burnout? a) Contaminants cannot be removed from the refrigerant and the refrigerant will have to be destroyed by the reclamation center b) The system will have to be flushed if contaminants are present c) The contaminants will eat away at the recovery equipment d) The contaminants will plug up the recovery equipment

b) The system will have to be flushed if contaminants are present

Why must containers designated as "refillable" by DOT be used for transporting recovered pressurized refrigerant? a) So refrigerants can be mixed b) To meet safety requirements c) To prevent overfilling d) To save on shipping cost

b) To meet safety requirements

After recovering refrigerant from a sealed system, if nitrogen is used to pressurize or blow debris out of the system, the nitrogen..? a) must be recovered b) may be vented to the ambient air c) should be returned to the cylinder d) should be used if mixed with R-22

b) may be vented to the ambient air

What does ozone depletion potential or "ODP" measure? a) The ability of a substance to cause global warming b) The ability of a substance to destroy ozone in the stratosphere c) A rating of health hazards caused by ozone depletion d) The length of time a refrigerant stays in the atmosphere

b) the ability of a substance to destroy the ozone

Which of the following refrigerants has the lowest ozone depletion potential? a) R-22 b) R-123 c) R-410A d) R-502

c

Manufacturers often color code the exterior of gauges. What color is the low pressure gauge on a typical gauge manifold set? a) Green b) Yellow c) Blue d) Red

c) Blue

You have to leak-check a unit which has lost a complete charge. Which gas(es) would cause the LEAST damage to the environment? a) Dry nitrogen and R-22 b) Compressed air and R-12 c) Dry nitrogen d) Dry nitrogen and R-134a

c) Dry nitrogen

What acids can CFC and HCFC refrigerants decompose into at high temperatures (e.g. open flames, glowing metal surfaces, etc.)? a) Boric and chromic acids b) Sulfuric and phosphoric acids c) Hydrochloric and hydrofluoric acids d) Phosphoric and dodecylbenzenesulfonic acid

c) Hydrochloric and hydrofluoric acids

Permanent safety markings are NOT required on which of the following areas on household refrigerators using HC refrigerants? a) On or near any evaporators and near any exposed refrigerant tubing b) Near the machine compartment c) On the inside of the refrigerator door d) On the exterior of the refrigerator

c) On the inside of the refrigerator door

Which word applies to the process that returns refrigerant to new product specifications and that requires chemical analysis? a) Recovery b) Recycle c) Reclaim d) Reprocess

c) Reclaim

Chlorofluorocarbons (CFCs), hydrochloroflourocarbons (HCFCs) and hydrofluorocarbons (HFCs) have which of the following in common? a) They deplete the stratospheric ozone layer b) They contain chlorine c) They must be recovered before opening or disposing of appliances d) They have the same saturation pressure of 70F

c) They must be recovered before opening or disposing of appliances

What may be done to speed the recovery process and ensure that all CFC, HCFC, or HFC refrigerant has been removed from a frost-free refrigerator? a) Cool the compressor to force liquid out of the high side b) Heat the recovery cylinder to vaporize liquid refrigerant c) Turn on the defrost heater to increase the refrigerant's temperature and vaporize any liquid d) Pack ice around the evaporator to ensure maximum liquid is available

c) Turn on the defrost heater to increase the refrigerant's temperature and vaporize any liquid

What type of certification is required for persons recovering CFCs, HCFCs, or HFCs during maintenance, service, or repair of small appliances? a) Type II Technician b) Type III Technician c) Type I Technician or Universal Technician d) Technician who has passed the core exam

c) Type I Technician or Universal Technician

If a large leak of refrigerant occurs such as from a filled cylinder in an enclosed area, what action should be taken when no self-contained breathing apparatus is available? a) Use butyl lined gloves and try to stop the leak b) Use a leak detector to locate the leak and try to stop the leak c) Vacate and naturally ventilate the area d) Make sure the unit is de-energized, close the service valves and try to stop the leak

c) Vacate and naturally ventilate the area

Which condition can cause excessive pressure on the high side of the self-contained (active) recovery device? a) When the thermal expansion valve is stuck open b) When the capacity of the recovery tank is larger than the charge size of the system c) When there is a large volume of non-condensable gas in the refrigerant being recovered d) When the system is set for no subcooling

c) When there is a large volume of non-condensable gas in the refrigerant being recovered

A very large refrigerant leak can cause suffocation because refrigerants..? a) smell strong and make breathing difficult b) are lighter than air and cause dizziness c) are heavier than air and displace oxygen d) sting the nose and cause sneezing

c) are heavier than air and displace oxygen

Manufacturers often color code the exterior of gauges. What color is the high pressure gauge on a typical gauge manifold set? a) Green b) Yellow c) Blue c) red

c) red

From which of the following does the ozone layer protect the earth? a) Nuclear radiation from the Van Allen belt b) Gamma radiation from the sun c) Ultraviolet radiation from the sun d) Infrared radiation from the sun

c)Ultraviolet radiation from the sun

After installing and opening a piercing access valve, the recovery procedure cannot begin if the system is at what pressure? a) 75 psig b) 50 psig c) 30 psig d) 0 psig

d) 0 psig

What is the approximate pressure of a storage cylinder of a recovered R-404A that does not contain any non-condensable impurities and is stored in a room where the temperature is 80F? a) 68 psig b) 72 psig c) 174 psig d) 288 psig

d) 288 psig

For which of the following refrigeration systems/appliances would it be permissible to use a passive recovery device for recovery of CFCs, HCFCs, and HFCs? a) A centrifugal air conditioner b) A reciprocating liquid chiller c) A single compressor, large commercial walk-in freezer d) A domestic refrigerator

d) A domestic refrigerator

Which of the following is NOT a violation of the Clean Air Act or EPA's regulations? a) Failing to keep required records b) Failing to meet the required evacuation levels before opening or disposing of appliances c) Knowingly releasing CFC, HCFC, or HFC refrigerants while repairing appliances d) Knowingly recovering an exempt refrigerant

d) Knowingly recovering an exempt refrigerant

Which of the following refrigerants is very high pressure and generally does NOT need to be recovered? a) R-22 b) R-134a c) R-404A d) R-744

d) R-744

Which refrigerants can be mixed in an appliance? a) R-22 and R-407C b) R-12 and R-134a c) R-407C and R-410A d) Refrigerants cannot be mixed

d) Refrigerants cannot be mixed

Why can technicians only charge used CFC, HCFC, or HFC refrigerant back into the evacuated appliance or into another appliance owned by the same owner? a) The used refrigerant may no longer meet the AHRI standard for virgin refrigerant b) The reporting associated with selling used refrigerant is complicated c) Used refrigerant is too valuable to give away d) Used refrigerant becomes a hazardous waste if it is transferred to another person

d) Used refrigerant becomes a hazardous waste if it is transferred to another person

When using a self-contained recovery device on a CFC, HCFC, or HFC system with an operating compressor, technicians must...? a) recover the refrigerant to 5 inches of mercury vacuum b) recover 80% of the nameplate charge c) recover the refrigerant to both 4 inches of mercury vacuum and 80% of the nameplate charge d) either recover the refrigerant to 4 inches of mercury vacuum or 90% of the nameplate charge

d) either recover the refrigerant to 4 inches of mercury vacuum or 90% of the nameplate charge

The sale of CFC, HCFC, HFC, and HFO refrigerants to service or install refrigeration and air conditioning equipment is? a) banned from use unless you have a recovery machine b) limited by law to HVAC Contractors and/or Mechanical Engineers c) allowed only if there is proof of need d) restricted to technicians who are EPA certified in refrigerant recovery

d) restricted to technicians who are EPA certified in refrigerant recovery

What characteristics of HFC refrigerants make them damaging to the environment? a) They are toxic to plants and animals at low doses b) They contain chlorine which damages the ozone layer c) They have a high Ozone Depletion Potential (ODP) d) They can have very high global warming potentials

d)they have very high global warming potentials