EPA CORE 608

Never heat a recovery tank with an open flam sensor because______________________ A) EPA regulations do not allow reclaimers to accept visibly burned tanks B) the high temperature can cause the pressure relief valve to vent, the tank to explode, or the refrigerant to decompose C) SNAP regulations require extra clean up of burnt refrigerant D) all of the above

B) the high temperature can cause the pressure relief valve to vent, the tank to explode, or the refrigerant to decompose

The release of any CFC, HCFC, or HFC refrigerant during_______________ is illegal A) The installation of manifold gauges equipped with low-loss fittings B) theft of equipment C) the connection of a recovery machine equipped with low-loss fittings D) all of the above

B) theft of equipment

A ternary blend refrigerant is a ________ A) two-part blend B) three-part blend C) two component, four part mixture D) terminally stable blend mixture

B) three-part blend

What does a section 608 certification allow a technician to do? A) Import virgin CFC from other countries B)Purchase or handle controlled refrigerants C) Service motor vehicle air conditioners using R-134a only D) Service any type of motor vehicle air conditioner in electric vehicles

B)Purchase or handle controlled refrigerants

When a system using POE oil has been opened, what is the minimum evacuation level that should be achieved and held before charging the system? A) 28 in HG B) 2000 microns C) 500 Microns D) 500 in HG

C) 500 Microns

Never fill a reliable refrigerant cylinder beyond ____________ A) 70% of its capacity by weight B) 70% of its capacity by volume C) 80% of its capacity by weight D) 80% of its capacity by volume

C) 80% of its capacity by weight

State and local governments A) cannot make any laws related to refrigerant recovery B) Can establish laws to reduce the federal refrigerant recovery requirements C) Can make laws that are stricter requirements than the federal regulations D) can temporarily suspend the prohibition on the manufacture of R-2 for up to 6 months

C) Can make laws that are stricter requirements than the federal regulations

If a system cannot maintain a vacuum, the system ________. A) should be charged immediately before air leaks in B) has been adequately evacuated for charging C) Could have a leak or still be evaporating off trapped refrigerant or moisture D) needs a new compressor

C) Could have a leak or still be evaporating off trapped refrigerant or moisture

_____________________ makes HFO refrigerants less flammable than HC refrigerants A) Chlorine B) Fhosgene C) Fluorine D) Fractured oxygen

C) Flourine

Never operate a hermetic compressor when the system ________. A) is under a light load B) Has a condenser exposed to temperatures above 105 degrees C) Is evacuated D) Will be operating continuously under maximum nameplate rated load

C) Is evacuated

Which of the following is legal? A) using any CFC refrigerant B) importing HFO refrigerants into the U.S C) Knowingly releasing refrigerants during the service, maintenance, repair, or disposal of appliances D) Selling recovered R-22 to any U.S based reclaimer

C) Knowingly releasing refrigerants during the service, maintenance, repair, or disposal of appliances

When transferring liquid in service hoses, you should guard against trapping __________________ A) Oil in the service hose B) Oil in the manifold gauge set C) Liquid refrigerant in the service hose between closed service valves D) Refrigerant vapor in the service hoses between closed service valves

C) Liquid refrigerant in the service hose between closed service valves

All non-exempt refrigerants ________. A) Deplete the stratospheric ozone layer B) contain chlorine C) Must be recovered before opening or disposing of appliances D) are toxic to sea life

C) Must be recovered before opening or disposing of appliances

In refrigerant accidents where death occurs, the major cause is ______________ A) Fire and refrigerant burns B) Toxic poisoning C) Oxygen deprivation D) Heart Attack

C) Oxygen deprivation

A compound pressure gauge measures pressure in___________ A) PSIA and PSIG B) PSIA and microns C) PSIG and inches of mercury D) PSIA and mm of mercury

C) PSIG and inches of mercury

Which refrigerant release is allowable by the EPA because the refrigerant is "exempt." A) Releasing R-410A from pre-2000 household refrigerators B) Releasing less than 5 pounds of mixed refrigerant from a recovery cylinder C) Releasing isobutane from a household freezer D) Releasing R-22 from appliances with a charge less than 1 pound

C) Releasing isobutane from a household freezer

What provides the cooling in a vapor compression refrigeration system? A) The Refrigerant turning into a liquid B) The compression of the refrigerant vapor C) The Vaporization of the liquid refrigerant D) The condensation of the refrigerant as it gives off heat in the condenser

C) The Vaporization of the liquid refrigerant

Approved refrigerant recovery cylinders have ________. A) Gray tops and yellow bodies B) Gray tops and red bodies if they have flammable refrigerants in them C) Yellow tops and gray bodies D) Red tops and yellow bodies

C) Yellow tops and gray bodies

All non-azeotropic refrigerants should be charged ________. A) as a vapor B) as a liquid and a vapor mixture at room temperature C) as a liquid D) the same as any pure refrigerant

C) as a liquid

A refrigerant label is placed on the _____________ A) cylinder to identify its total weight B) cylinder to identify pressure C) cylinder to identify the refrigerant D) truck carrying the refrigerant to identify the cylinders owner

C) cylinder to identify the refrigerant

When a system is operating, refrigerant leaves the condenser as a ___________________________ A) low pressure two phase mixture B) low pressure superheated vapor C) high pressure liquid D) high pressure subcooled vapor

C) high pressure liquid

You heat a system during dehydration ________ A) to oxidize any acids in the system B) to increase oil viscosity and increase oil vaporization C) to raise the vapor pressure of the water in the system and decrease dehydration time D) to prevent oil oxidation and degradation

C) to raise the vapor pressure of the water in the system and decrease dehydration time

_______________ refrigerants have the highest ODP

CFCs

Reusable refrigerant containers that store refrigerant at any pressure above 15 psig (at normal ambient temperature) must be hydrostatically tested every ________. A) 2 years B) 3 years C) 4 years D) 5 Year

D) 5 Year

Azeotropic refrigerant mixtures__________________ A) are more stable than non-azeotropic mixtures B) Must only be charged as a liquid C) Must only be charged as a superheated vapor D) Act like a single component refrigerant and can be charged as either a liquid or vapor

D) Act like a single component refrigerant and can be charged as either a liquid or vapor

When working with nitrogen_____________ A) Always use a pressure regulator on the nitrogen cylinder B) Always have a pressure relief valve downstream of the pressure regulator C) never use liquid nitrogen D) All of the above

D) All of the above

Which is recommended after a burnout? A) Install both a liquid line and suction line filter drier B) Flush the system (not compressor) with a commercial system flushing solution C) Purge with dry nitrogen before and after using the flushing solution D) All of the above

D) All of the above

____________________ the speed of evacuation A) The size of the equipment being evacuated and the size of the vacuum pump both affect B) The ambient temperature affects C) The moisture in the system affects D) All of the above

D) All of the above

Before recharging any flammable hydrocarbon or HFO refrigerant, always _______________ A) electrically ground the recovery machine and recovery tank, and verify the refrigeration system is grounded B) install a fresh filter drier, successfully complete a standing-pressure leak check at the maximum system pressure, and then evacuate to at least 500 microns C) add the EPA-mandated odorant in case the system develops a leak D) Both A and B

D) Both A and B

Recovery cylinders are labeled to indicate the refrigerants inside to: A) Avoid accidental mixing of recovered refrigerants and allow a recycler to identify the contents B) Allow the technicians company to determine the amount of refrigerant recovered for record keeping purposes C) determine if the refrigerant must be reclaimed or is clean D) Both A and B

D) Both A and B

Which additional safety precaution should be followed when using flammable refrigerants? A) Always make certain the recovery tank and recovery unit are grounded before being used B) Do not cut or weld any refrigerant line when refrigerant is in the unit. C) Never let the refrigerant hoses touch the ground D) Both A and B

D) Both A and B

Which appliances are not covered by EPA regulations? A) Mini Fridges B) Ice makers C) Commercial refrigeration equipment D) Desiccant dehumidifiers

D) Desiccant dehumidifiers

All CFC, HCFC, and HFC refrigerant recovery devices must ________. A) be portable B) Contain a heavy duty splash shield C) Have a two-stage vacuum pump D) Meet EPA standards

D) Meet EPA standards

Under the EPA's regulations, when can disposable cylinders be used to recover refrigerant? A) In an emergency to avoid venting B) When there is no visible rust or corrosion on the cylinder or valve C) When disposing of the refrigerant D) Never

D) Never

Which refrigerant can be purchased if you don't have EPAS section 608 certification? A) Only ozone-depleting substances used in small appliances B) Only non-ozone depleting substances used in industrial refrigeration. C) Only reclaimed refrigerants D) Only refrigerants that are exempt from the venting prohibition

D) Only refrigerants that are exempt from the venting prohibition

Which of the following refrigerants has the lowest global warming potential? A) R-1234YF B) R-134A C) R-404A D) R-600a

D) R-600a

How does the GWP of R-410A compare to carbon dioxide? A) Almost the same, both are about 1. B) The GWP of R-410A is 10 times lower C) The GWP of carbon dioxide is times lower D) The GWP of R-410A is thousands of times greater

D) The GWP of R-410A is thousands of times greater

Which refrigerants must be recovered ___________________ A) All HFCS except R1324a B) CFCs and HCFCS but not HFCS C) Only HCFCS and HFOS D) all non-exempt refrigerants

D) all non-exempt refrigerants

Always ________________ when operating refrigerant recovery or recycling equipment A) wear safety glasses B) wear protective gloves C) follow all safety precautions (for the equipment) D) all of the above

D) all of the above

How do scientists know that the chlorine in the stratosphere is not primary from volcanoes? A) The amounts of chlorine and fluorine are similar and fluorine does not come from volcanoes B) The rise in chlorine levels in the stratosphere matcher the rise in ozone depleting emissions C) Volcanic eruptions only produce a small quantity of chlorine D) all of the above

D) all of the above

Refrigerant cylinders should ____________ A) be free of rust and damage and have a valid pressure test marking B) never be filled to more than 80% capacity C) alway be labeled and secured in the vehicle D) all of the above

D) all of the above

When working with nitrogen, ____________________ A) Always use a nitrogen regulator B) Always have a pressure relief valve downstream of the regulator C) Never use liquid nitrogen D) all of the above

D) all of the above

Which is a violation of EPA or Clean Air Act regulations? A) Failing to evacuate refrigerant in a system to the required evacuation level B) Failing to evacuate refrigerant in a leaking system to at least 0 PSIG C) Adding nitrogen to a fully charged system, and then calling the mixture a "leak check gas" and venting the mixture to the atmosphere D) all of the above

D) all of the above

_______________ the speed of dehydration A) The size of the equipment being evacuated and the size of the vacuum pump both affect B) the ambient temperature affects C) the moisture in the system affects D) all of the above

D) all of the above

When planning to recovery flammable refrigerants, always ensure that______________________ A) the refrigerant is cooled first B) the recovery machine is rated for the refrigerant being recovered C) the recovery machine and the recovery tank are grounded D) both B and C

D) both B and C

When a system is operating, the ___________ changes the refrigerant from a high-pressure vapor to a high-pressure liquid A) suction line accumulator B) discharge line accumulator C) compressor D) condenser

D) condenser

The center port on a three-port manifold is used to______________ A) obtain gauge readings B) pump air into system C) provide a by-pass from low to high side D) connecting to recovery devices, vacuum pumps, and refrigerant charging cylinders

D) connecting to recovery devices, vacuum pumps, and refrigerant charging cylinders

HFC refrigerants contain: A) helium, fluoride, and chlorine B) hydrazine, flouride, and chlorine C) helium, fluorine, carbon D) hydrogen, fluorine, carbon

D) hydrogen, fluorine, carbon

Ester based oil like POE can be mixed with ____________________ A) PAG and mineral oils B) Paraffinic mineral oils C) alkyl benzene oils D) no other oils

D) no other oils

A refrigerant cylinder that has a gray body and yellow top is deigned to hold _______________ A) only flammable refrigerants B) nitrogen C) R-22 or R407C D) recovered refrigerant

D) recovered refrigerant

If corrosion is discovered in the body of a relief valve, the valve must be ________. A) lubricated B) wire brushed and painted C) soaked in alcohol for at least 16 hours D) replaced

D) replaced

Service hoses used for system evacuation ________. A) must have a red-stripe to denote their vacuum service rating B) must have a 5/8 service connection C) are always sized smaller than the pump intake connection to prevent vacuum pump oil contamination D) should be equal to or larger than the pump intake connection for faster evacuation

D) should be equal to or larger than the pump intake connection for faster evacuation

When a system is operating, refrigerant enters the compressor of a refrigerant system as a __________________________ A) superheated liquid B) subcooled vapor C) subooled vapor D) superheated vapor

D) superheated vapor

How much can a technician be fined for venting a non-exempt refrigerant from a system? A)$14,439 B)$27,539 C)$37,839 D)$44,539

D)$44,539

A reduction in stratospheric ozone cause______________

Decreased crop yields and damage to marine organisms

what is being done in the US to stop damage to the stratospheric ozone layer?

Eliminating the use of CFCs and HCFCs refrigerants

EPA recommends this service practice to conserve refrigerant

Find and repair leaks in the system

______________ damages the stratospheric ozone

HCFCs

Which of the following proves that HCFCs are in the stratosphere?

HCFCs found in air samples from the stratosphere

Ozone contains ____________________ A) Molecule containing 2 oxygen atoms B) Molecules containing 3 oxygen atoms C) Molecules containing 4 oxygen atoms D) Molecules containing 5 oxygen atoms

Molecules containing 3 oxygen atoms

Oxygen or compressed air should never be used to pressurize a system because ________.

Oxygen or compressed air can explode when mixed with compressor oil or some refrigerants

Which refrigerant is an HFO?

R-1234yf

which refrigerant is an HFC

R-134a

Which refrigerant depletes the ozone layer?

R-22

Which refrigerant can fractionate?

R-407C

high pressure gauge on a typical gauge manifold set is typically colored ___________________

Red

________________ to verify the allowable machine test pressure A) Ask the owner B) Use the saturation refrigerant table C) Use the value on the system nameplate D) All of the above would be acceptable

Use the value on the system nameplate

EPA regulations require appliances to have ____________

a service aperture or process stub

Which ASHRAE refrigerant safety classification is the safest? A) A1 B) A2L C) A3 D) B4

A) A1

Long hoses between the unit and the recovery machine ________. A) Can cause excessive pressure drop and increased recovery time B) Help to reduce recovery time by isolating the system C) Isolate the system from vibration and thereby reduce recovery time D) are recommended as a safety precaution with flammable refrigerants

A) Can cause excessive pressure drop and increased recovery time

Technicians who violate Clean Air Act provisions A) Can lose their certification B) will have their equipment confiscated C) will be required to take mandatory training D) may be required to pas an online test

A) Can lose their certification

Before recycling or discarding, a disposable cylinder should be ________. A) Emptied to 0 PSIG and then rendered useless by puncturing or breaking off the valve B) Emptied to any pressure below 5 PSIG and then rendered useless C) Emptied to 0 PSIG and then painted with the words "Empty-Safe to discard" D)Emptied to less than 10 PSIG and then painted with the words "Empty-Safe to Discard"

A) Emptied to 0 PSIG and then rendered useless by puncturing or breaking off the valve

the EPA's "safe disposal requirements" , make the _______________ responsible for ensuring that all refrigerant has been removed from household refrigerators before they are disposed A) Final person in the disposal chain B) equipment owner C) Last person to service the unit D) either B or C

A) Final person in the disposal chain

______________ contains chlorine A) R-22 B) R-407C C) R-410A D) R-1234yf

A) R-22

Non-toxic refrigerants can still cause death because ________. A) They are heavier than the air and can cause asphyxia B) they are flammable C) they are lighter than is air and cause asphyxia D)they can become toxic when mixed with air

A) They are heavier than the air and can cause asphyxia

Which synthetic oil is commonly used with HFC refrigerants? A) polyolester B) Glycolbenzene C) Alkybenzene D) Mineralester

A) polyolester

After refrigerant is phased-out, supplies of that refrigerant for equipment servicing can only come from A) Recovered and reclaimed refrigerant B) Third-World Countries C) Chinese and Indian manufacturers under a special permit D)exemptions granted under the Montreal Protocol

A) recovered and reclaimed refrigerant

Use ________________ to determine a safe pressure for leak testing A) the value on the low side of test pressure data plate B) the suction side operating pressure C) the saturation pressure of the refrigerant charge at 95 degrees D) 1.314 times the saturation pressure of the refrigerant charge at 95 degrees

A) the value on the low side of test pressure data plate

Dehydrating means to remove _____________ A) water and water vapor B) acid and acid vapor C) impurities from a system D) all of the above

A) water and water vapor

A system containing a flammable refrigerant must have the process tubes or service connection marked with a color marking that extends a minimum of _______________ in both directions A) one-half inch B) 1 inch C) 2 inches D) 4 centimeters

B) 1 inch

The production and import of new R-22 in the U.S to service the existing systems is banned beginning in A) 2019 B) 2020 C) 2023 D) 2024

B) 2020

Non-Azeotropic refrigerants leak from a system ______________ A) At a faster rate due to the smaller molecule B) At uneven rates because of the different vapor pressures C) At a slower rate than pure refrigerants because they are a larger molecule D) in exactly the same way as all other refrigerants

B) At uneven rates because of the different vapor pressures

Ozone depletion is caused by ___________________ in HCFC refrigerants A) fluorine B) Chlorine C) Carbon D) hyrdrogen

B) Chlorine

Portable refillable tanks must meet ________ standards. A) SNAP B) Department of Transportation C) Department of Energy D) All of the above

B) Department of Transportation

Low ambient temperatures _____________ recovery time A) Decrease B) Increase C) Have no effect on D) Saturate

B) Increase

If there is a large release of refrigerant in a contained area _____________________ A) put on safety goggles and lined butyl gloves before cleaning up the mess B) Leave the area, and return with the self contained breathing apparatus C) all clothing exposed to the refrigerant will have to be incinerated D) dust masks and safety goggles are required before reentering

B) Leave the area, and return with the self contained breathing apparatus

An oil sample should be taken for which of the following reasons? A) The charge has to be topped off B) Moisture or acid is suspected C) The Unit is not cooling D) A hard start kit had to be installed on the system

B) Moisture or acid is suspected

The ability of a substance to destroy ozone in the stratosphere is referred to as _____________ A) GWP (global warming potential) B) ODP (ozone depletion potential) C) GOP (global ozone potential D) GOE (global ozone extinction)

B) ODP (ozone depletion potential)

HFO refrigerants are miscible in ________ lubricants. A) All B) POE lubricants C) Mineral Oils D) Alkylbenzene (AB) oil

B) POE lubricants

______________ Is cleaning the refrigerant for immediate reuse by oil separation and single or multiple passes through devices, like replaceable core filter driers A) recovering B) recycling C) reclaiming D) restoring

B) Recycling

What doe not require section 608 certification? A) Recovery refrigerant B) Rewiring a condenser fan C) replacing an.evaporator D) attaching a piercing self tapping Schrader valve

B) Rewiring a condenser fan

All new recovery equipment must ________. A) be calibrated to measure the refrigerant recovered B) be EPA approved and have an EPA approved certification label attached C) use lubrication free compressors D) be rated for flammable refrigerants

B) be EPA approved and have an EPA approved certification label attached

During servicing of any refrigeration system, the refrigerant must be ________. A) Reclaimed B) Recovered C) Recycled D) all of the above

B) recovered

An oil sample might taken when ______________-

moisture and/or acid problems are suspected, oil sludge formation or oil waxing is suspected, AND residual; acidic oil from a burn-out is suspected of contaminating the replacement oil

How many refrigerants can be recovered into the same cylinder?

one

in addition to the saturation pressure-temperature behavior of refrigerants, when considering a substitute refrigerant also consider _____________

cooling capacity flammability and toxicity materials compatibility

What makes HFC refrigerants damaging to the environment?

They can have very high global warming potentials.

Hygroscopic oils___________________

absorb lots of moisture

Distributors must verify ________ before they can sell refrigerant?

that the purchaser employs at least one section 608 certified technician

What happens when EPA regulations change after a technician is certified?

the technician has a responsibility to keep up with changes in EPA regulations