Core Questions
A system is considered dehydrated when _____. A) A micron-gauge shows you have reached and held a vacuum of 500 microns or less with the vacuum pump isolated from the system B) A micron-gauge shows you can maintain a vacuum of at least 500 microns, for at least 5 minutes, while the vacuum pump is operating C) The manifold suction gauge is bottomed-out at 29.9 in. hg for at least an hour D) The vacuum pump sound is indicating that nothing else is being pumped out
A) A micron-gauge shows you have reached and held a vacuum of 500 microns or less with the vacuum pump isolated from the system
EPA regulations require appliances to have ________. A) A service aperture or process stub B) Purge valves or purge units C) King valves D) Oversized filter driers
A) A service aperture or process stub
Which ASHRAE refrigerant safety classification is the safest? A) A1 B) A2L C) A3 D) B4
A) A1
Reclaimed refrigerant must be tested to meet _____ before it can be resold. A) AHRI 700 B) AEPA 700 C) ASHRAE 700 D) UL 700
A) AHRI 700
Which of the following synthetic lubricants is used with ternary refrigerant blends containing HCFCS? A) Alkylbenzene B) Glycolbenzene C) All Boron oil D) Castor oil
A) Alkylbenzene
The Montreal Protocol is _____. A) An international treaty that addresses ozone-depleting substances and their alternatives B) A test procedure or protocol to use when measuring GWP C) A test procedure or protocol to use when measuring ODP D) An international treaty that certified technicians and recovery equipment
A) An international treaty that addresses ozone-depleting substances and
The service hose between the system and the vacuum pump should _____. A) Be as short as possible B) Have a red stripe and be vacuum service rated C) Have a 5/8 flare connection D) Never be colored red or blue
A) Be as short as possible
Why is venting an "exempt refrigerant" legal? A) Because the EPA has determine that the refrigerant does not pose a threat to the environment if released B) Because the EPA has not yet made it illegal to vent that particular refrigerant C) Because the refrigerant is not yet SNAP approved D) Because the environmental analysis is not yet complete
A) Because the EPA has determine that the refrigerant does not pose a threat to the environment if released
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 pass an online test
A) Can lose their certification
What refrigerant servicing does NOT require Section 608 certification? A) Carbon dioxide refrigerant B) R-410A C) R-1234yf D) R-134a
A) Carbon dioxide refrigerant
Which health effect increases from loss of the stratospheric ozone layer? A) Cases of cataracts and skin cancer B) Cases of heart attacks C) Increased respiratory issues D) Thyroid disorders
A) Cases of cataracts and skin cancer
EPA regulations only allow recovered or recycled refrigerant to be _____. A) Charged into the same or another appliance owned by the same person B) Sold for use directly in small appliances C) Reclaimed D) Incinerated
A) Charged into the same or another appliance owned by the same person
A reduction in stratospheric ozone causes _____. A) Decreased crop yields and damage to marine organisms B) Reduced cataracts and skin cancers C) Reduced sunlight and more precipitation D) Global warming
A) Decreased crop yields and damage to marine organisms
CFCs and HCFCs ______ making them capable of reaching the stratospheric ozone layer. A) Do not dissolve in water or easily break down in the atmosphere B) Are lighter than other chlorine compounds C) Jet upward when released D) Are attracted to ultraviolet radiation
A) Do not dissolve in water or easily break down in the atmosphere
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
Oxygen or compressed air should never be used to pressurize a system because _____ . A) Oxygen or compressed air can explode when mixed with compressor oil or some refrigerants B) Oxygen or compressed air is too corrosive C) Oxygen or compressed air displace refrigerant D) Oxygen or compressed air displace oil
A) Oxygen or compressed air can explode when mixed with compressor oil or some refrigerants
Which synthetic oil is commonly used with HFC refrigerants? A) Polyolster (POE) B) Glycolbenzene (GBE) C) Alkylbenzene (AB) D) Mineralester (MAE)
A) Polyolster (POE)
If the compressor crankcase is coldest part of the system, refrigerant will migrate to the compressor because of the difference in ______ in the system. A) Pressure B) Moisture content C) Acid content D) Both acid and moisture content
A) Pressure
Before shipping any recovered refrigerant, you must A) Properly label the refrigerant container B) Fill the cylinder capacity C) Verify the recipient is Section 608 certified to reclaim refrigerant D) Check the pressure of the refrigerant
A) Properly label the refrigerant container
Which refrigerants is an HFO? A) R-1234yf B) R-123gq(E) C) R-134a D) R-410A
A) R-1234yf
Which refrigerant is an HFC? A) R-134a B) R-600a C) R-1234yf D) R-123zd
A) R-134a
_____ contains chlorine. A) R-22 B) R-407C C) R-410A D) R-1234yf
A) R-22
Which refrigerant can fractionate? A) R-407C B) R-410A C) R-600a D) R-290
A) R-407C
Which refrigerant is considered a high-pressure refrigerant? A) R-410A B) R-113 C) R-123 D) R-11
A) R-410A
Before disposing of any appliance containing refrigerant ______. A) Recover the refrigerant B) Vent the refrigerant so safety issues are not violated and no one is harmed C) Purge the refrigerant with nitrogen D) Seal the appliance to prevent any refrigerant from escaping
A) Recover the refrigerant
After a 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
_____ is the removal of refrigerant from a system and storing it in a container without testing or processing it in any way. A) Recovering B) Recycling C) Reclaiming D) Restoring
A) Recovering
The program identifies alternative refrigerants for use. A) SNAP B) E-Star C) The ASHRAE-approved (AA) D) Energy Star
A) SNAP
When a system is operating, refrigerant enters the expansion device as a _______. A) Subcooled or saturated liquid B) Subcooled or saturated vapor C) Superheated vapor D) Superheated mixture of vapor and liquid
A) Subcooled or saturated liquid
When disposing of an appliance with 5-50 pounds of refrigerant, you must record _____ A) The type of refrigerant recovered B) The quantity of refrigerant, by type, recovered from the appliance during the past 12 months C) The quantity of refrigerant, by type, sent for reclamation or destruction D) All of the above
A) The type of refrigerant recovered
Use _____ to determine a safe pressure for leak testing A) The value of the low-side test pressure data plate B) The suction-side operating pressure C) The saturation pressure of the refrigerant charge at 95 °F D) 1.314 times the saturation pressure of the refrigerant charge at 95 °F
A) The value of the low-side test pressure data plate
Non-toxic refrigerants can still cause death because _______. A) They are heavier than air and can cause asphyxia B) They are flammable C) They are lighter than air and can cause asphyxia D) They can become toxic when mixed with air
A) They are heavier than air and can cause asphyxia
Dehydrating means to remove A) Water and water vapor B) Acid and acid vapor C) All impurities of from a system D) All of the above
A) Water and water vapor
A _____ recovery device uses the compressor in the appliance and/or the pressure of the refrigerant in the appliance. A) system-dependent B) pressure-dependent C) compressor-dependent D) self-sufficient
A) system-dependent
What are the characteristics of hydrofluoroolefins and hydrocarbon refrigerants? A) 0 ODP but high GWP B) 0 ODP and low GWP C) High ODP and 0 GWP D) High ODP and high GWP
B) 0 ODP and low GWP
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
According to the Roland-Molina theory, _____ are destroyed by each chlorine atom in the stratosphere. A) 200 ozone molecules B) 100,000 ozone molecules C) 10 ozone molecules D) 25,200 ozone molecules
B) 100,000 ozone molecules
The production and import of new R-22 in the US to service exisiting systems is banned beginning in A) 2019 B) 2020 C) 2023 D) 2024
B) 2020
________ can combine to cause a fire or explosion when working with flammable hydrocarbon refrigerants. A) Electrical wiring and water vapor B) A sufficient concentration of the refrigerant in the space and an ignition source C) A leak from the system and corrosion at the leak source D) Warm temperatures and oil
B) A sufficient concentration of the refrigerant in the space and an ignition source
Which action is a violation of the prohibition on venting refrigerants? A) Release of "de minimis" quantities in the course of making good faith attempts to recover refrigerant B) Adding nitrogen to a fully charged appliance to leak check the appliance and then venting the mixture C) Refrigerant that leaks when the system is operating D) Refrigerant that leans when connecting low-loss hoses.
B) Adding nitrogen to a fully charged appliance to leak check the appliance and then venting the mixture
According to the EPA, _____ should be used to remove ice from a sight glass. A) a torch on low flame only B) an alcohol spray C) hot water D) a flat file or screwdriver
B) An alcohol spray
What gas is used as the baseline measurement for GWP? A) Carbon monoxide B) Carbon dioxide C) Ethane D) Propane
B) Carbon dioxide
Ozone depletion is caused by _______ in HCFC refrigerants. A) fluorine B) chlorine C) carbon D) hydrogen
B) Chlorine
The Department of Transportation (DOT) requires _______ when transporting cylinders containing used refrigerant. A) SNAP-approved containers B) DOT classification tags C) EPA-certified trucks D) all of the above
B) DOT classification tags
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
The EPA considers _____ the most effective for locating the general area of a small leak. A) deep vacuum test B) electronic or ultrasonic tester C) halide torch D) audible sound
B) Electronic or Ultrasonic tester
What is being done in the US to stop damage to the stratospheric ozone layer? A) Using coal instead of nuclear power to produce electricity B) Eliminating the use of CFCs and HCFCs refrigerants C) Enforcing strict emission requirements on two-cycle engines D) All of the above
B) Eliminating the use of CFCs and HCFCs refrigerants
Which type of refrigerant typically has the lowest global warming potential? A) CFCs B) HFOs C) HCFCs D) All are equal
B) HFOs
Low ambient temperatures ______ recovery time. A) Decrease B) Increase C) Have no effect on D) Saturate
B) Increase
In 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 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 self-contained breathing apparatus
Under normal conditions, refrigerant enters the compressor of a refrigerant system as a _____. A) Low-pressure liquid B) Low-pressure vapor C) High-pressure liquid D) High-pressure vapor
B) Low-pressure vapor
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.
Ozone contains _____. A) molecules containing 2 oxygen atoms B) molecules containing 3 oxygens atoms C) molecules containing 4 oxygen atoms D) molecules containing 5 oxygen atoms
B) Molecules containing 3 oxygen atoms
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)
What action violates the EPA's prohibition on venting? A) Small accidental release of refrigerant when servicing a unit B) Opening the system without properly recovering the refrigerant first C) A catastrophic failure of a system D) Refrigerant lost when connecting or disconnecting low-loss hoses
B) Opening the system without properly recovering the refrigerant first
HFO refrigerants are miscible in __________ lubricants. A) All B) POE lubricants C) Mineral oils D) Alkylbenzene (AB) oil
B) POE lubricants
Which of the following statements is true? A) The propane used in grills can be used in chillers. B) Propane cylinders for grilling contains impurities that refrigerant-grade propane does not have. C) Propane cylinders for grilling have the same purity as refrigerant-grade propane. D) Propane is natural HFO
B) Propane cylinders for grilling contains impurities that refrigerant-grade propane does not have.
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
An example of an HCFC refrigerant is: A) R-407C B) R-123 C) R-134a D) R-404A
B) R-123
Which refrigerant is considered a low-pressure refrigerant? A) R-407C B) R-123 C) R-134a D) R-404A
B) R-123
During servicing of any refrigeration system, the refrigerant must be _____ A) Reclaimed B) Recovered C) Recycled D) All of the above
B) Recovered
______ 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
If technicians lose their certification card, they must ______. A)order a replacement from the EPA within 100 days B) Request a replacement from the company that provided the certification C) Have the refrigerant supply house certify to the EPA that they had a certification card D) Order a replacement from the EPA within 30 days or face permanent loss of certification
B) Request a replacement from the company that provided the certification
What does NOT require Section 608 certification? A) Recovering refrigerant B) Rewiring a condenser fan C) Replacing an evaporator D) Attaching a piercing self-tapping Schrader valve
B) Rewiring a condenser fan
Which of the following is a lawful use of HCFC-22? A) Assembling "dry-charge" components into a system and then charging with reclaimed R-22 B) Servicing existing R-22 systems C) Charging any new system designed for R-407C with reclaimed or recovered R-22 D) All of the above
B) Servicing existing R-22 systems
Which material is NOT compatible with any HFO refrigerant? A) Neoprene B) Silicone C) Copper D) None
B) Silicone
How does the GWP of R-441A compare to the GWPs of R-410A? A) The GWP of R-441A is significantly higher B) The GWP of R-441A is significantly lower C) They are both blends and the GWP's are about equal. D) They are both blends and the GWP of R-410A is just slightly higher.
B) The GWP of R-441A is significantly lower
What happens when EPA regulations change after a technician is certified? A) The technician has 18 months to get recertified. B) The technician has a responsibility to keep up with changes in EPA regulations. C) If certified after 2002, the technician has 18 months to get recertified. D) The technician must attend an 8-hour refresher class to become recertified.
B) The technician has a responsibility to keep up with changes in EPA regulations.
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
Why are flammable HFO refrigerants classified as A2L and not A2? A) Only the liquid is flammable B) They have low flammability, being less flammable than HC refrigerants. C) They have lingering flammability. D) The have low GWP.
B) They have low flammability, being less flammable than HC refrigerants.
A ternary blend refrigerant is a ____. A) Two-part blend B) Three-part mixture C) Two component, four-part mixture D) Terminally stable blend mixture
B) Three-part mixture
When shipping refrigerant cylinders, they should be stored _____. A) Inverted to prevent damage to the service valve B) Upright C) Horizontally D) Stacked three high
B) Upright
Which refrigerant release is illegal? A) Knowingly venting an exempt refrigerant because it does not pose a threat to the environment. B) Venting refrigerant from an approved dual-refrigerant recovery machine to switch working fluids. C) Releasing refrigerant while connecting low-loss service hoses. D) Small "de minimis" releases while recovering refrigerant.
B) Venting refrigerant from an approved dual-refrigerant recovery machine to switch working fluids.
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
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
The capacity of a vacuum pump and its suction line size affect _____. A) oil removal B) moisture removal and evacuation time C) oil viscosity D) system safety
B) moisture removal and evacuation time
A "self-contained" recovery device _____. A) cannot be used anymore B) removes refrigerant with the assistance of components in the appliance C) must have the recovery tank inside the recovery unit D) can only be used on a system with 5 pounds or less of refrigerant
B) removes refrigerant with the assistance of components in the appliance
Never mix different refrigerants in the same container because _______. A) they could become flammable and/or toxic B) they could be impossible to reclaim C) they could be using different lubricants D) it is a violation of Department of Transportation (DOT) regulations
B) they could be impossible to reclaim
When measuring a vacuum of the system, the vacuum gauge should be connected _______. A) at the vacuum pump inlet B) to the system as far as possible away from the vacuum pump C) to the center hose of the manifold gauge D) at the vacuum pump outlet
B) to the system as far as possible away from the vacuum pump
How should disposable cylinders be discarded? A) Vent the remaining refrigerant and render the cylinder useless. B)Recover all remaining refrigerant, render the cylinders useless, and recycle the metal. C) Don't discard them; approved recyclers can refill them for reuse. D) Reuse the cylinders as nitrogen gas tanks.
B)Recover all remaining refrigerant, render the cylinders useless, and recycle the metal.
Never heat a recovery tank with an open flame 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 pressure range that is typically displayed on a high-pressure manifold gauge is _______. A) 300 microns to 550 psia B) 0 to 2,000 psig C) 0 to 800 psig D) 250 psia to 750 psia
C) 0 to 800 psig
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 refillable 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
Hygroscopic oils _____. A) Are poor lubricants B) Are not compatible with HFC refrigerants C) Absorb lots of moisture D) Never absorb water which is why they are so popular
C) Absorb lots of moisture
The low-pressure gauge on a typical gauge manifold set is colored _____. A) green B) yellow C) blue D) red
C) Blue
____ refrigerants are the more harmful to stratospheric ozone. A) HC B) HCFCs C) CFCs D) HFCs
C) CFCs
_____ refrigerants have the highest ODP. A) HC B) HCFCs C) CFCs D) HFCs
C) CFCs
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-22 for up to 6 months
C) Can make laws that are stricter requirements than the federal regulations
Refrigerant vapors should never be inhaled because they _____ A) Are corrosive B) Are extremely toxic C) Could cause heart irregularities or unconsciousness D) Could case diabetes
C) Could cause heart irregularities or unconsciousness
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
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 cylinder's owner
C) Cylinder to identify the refrigerant
Which gas would cause least damage when used for leak checking? A) Nitrogen and R-134a B) Compressed air and R-410A C) Dry nitrogen alone D) Dry nitrogen and R-407C
C) Dry Nitrogen alone
EPA recommends this service practice to conserve refrigerant. A) Use compressed air instead of refrigerant for leak testing. B) Heat the system when charging. C) Find and repair leaks in the system. D) Remove all Schrader valves and process tubes from the system.
C) Find and repair leaks in the system.
_____ make(s) HFO refrigerants less flammable than HC refrigerants A) Chlorine B) Fhosgene C) Fluorine D) Fractured Oxygen (FO)
C) Fluorine
Which of the following proves that HCFC's are in the stratosphere? A) Scientists with extensive laboratory testing. B) Measurement of ozone at ground level. C) HCFC's found in air samples from the stratosphere. D) Satellite measurements of light passing through the atmosphere.
C) HCFC's found in air samples from the stratosphere.
______ damages stratospheric ozone. A) HFOs B) HCs C) HCFCs D) HFC
C) HCFCs
HCFC refrigerants are made up of _______. A) Helium, chloroform, fluorine, and chlorine B) Hydrogen, chlorine, ferrite, and calcium C) Hydrogen, chlorine, ferrite, and carbon D) Hydrogen, chlorine, ferrite, and calcium
C) Hydrogen, chlorine, ferrite, and carbon
What is one of the most serious results of loss of the stratospheric ozone layer? A) Increased hurricanes B) Increased tornadoes C) Increased rates of skin cancer D) Decreased ground-level ozone
C) Increased rates of skin cancer
Never operate hermetic compressor when the system _____ A) Is under a light load B) Has a condenser exposed to temperatures above 105 °F C) Is evacuated D) Will be operating continuously under maximum nameplate-rated load
C) Is evacuated
Which of the following is illegal? 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
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
After proper R-410A refrigerant recovery, you should use _____ to leak check the system. A) Any available HFC and nitrogen B) Nitrogen and HCFC-22 C) Nitrogen, and if a trace gas is desired, add a small amount of R-410A D) Compressed air
C) Nitrogen, and if a trace gas is desired, add a small amount of R-410A
Department of Transportation (DOT) regulations require the ______ to be recorded on the shipping paper for hazard class 2.2 Nonflammable Compressed Gases. A) Total weight of all refrigerant on the vehicle B) Total volume of all refrigerant on the vehicle (at atmospheric pressure) C) Number of cylinders of each gas D) All of the above
C) Number of cylinders of each gas
In refrigerant accidents where death occurs, the major cause is ____. A) Fire an 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 in mercury D) Psia and mm of mercury
C) Psig and inches in mercury
Which refrigerant depletes the ozone layer? A) R-600a B) R-1234yf C) R-22 D) R-410A
C) R-22
_____ refrigerant has an ODP that is greater than 0. A) R-600a B) R-441A C) R-22 D) R-290
C) R-22
_____ has the lowest ODP. A) R-11 B) R-22 C) R-410A D) R-502
C) R-410A
______ returns refrigerant to new product specifications and requires chemical analysis to verify the purity to AHRI-700 standards. A) Recovering B) Recycling C) Reclaiming D) Restoring
C) Reclaiming
If R-410A was added to an R-22 system, ______. A) Vent the R-410A because it is higher in pressure B) Vent the mixture because it cannot be reclaimed C) Recover the mixture in a separate recovery tank D) Top off the system with either R-22 of R-410A because the mixture cannot be reclaimed
C) Recover the mixture in a separate recovery tank
A system containing a flammable refrigerant must have the process tubes marked with a _____ color A)Green B) Yellow C) Red D) Orange
C) Red
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
Which of the following gases help from the earth's protective shield? A) Aragon B) Oxygen C) Stratospheric ozone D) Carbon dioxide
C) Stratospheric ozone
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
_______, only containers designated "refillable" by DOT can be used for transporting recovered pressurized refrigerant. A) To reduce shipping logistics B) To reduce cost C) To meet safety requirements D) All of the above
C) To meet safety requirements
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 and oxidation and degradation
C) To raise the vapor pressure of the water in the system and decrease dehydration time
_____ 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
C) Use the value on the system nameplate
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 vapor mixture at room temperature C) as a liquid D) the same as any pure refrigerant
C) as a liquid
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
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
Before working with any unknown solvents, chemicals, or refrigerants, always review the _____. A) mastic solubility data sheet (MSDS) B) reference chemical compounds (RCCs) C) safety data sheets (SDS) D) mixture solvent data sheet (MSDS)
C) safety data sheets (SDS)
Recovery cylinders should never be overfilled because _____. A) there are strict OSHA limits on the maximum weight of cylinders B) you must always leave space for an emergency recovery application C) the internal pressure of the cylinders can rise in heated areas and cause an explosion or venting D) overfilling accelerates internal corrosion
C) the internal pressure of the cylinders can rise in heated areas and cause an explosion or venting
A system is evacuated _________. A) to find leaks B) to verify it is leak free C) to dehydrate the system D) all of the above
C) to dehydrate the system
The stratospheric zone layer protects us from _______. A) infrared radiation from space B) alpha radiation from the sun C) ultraviolet radiation from the sun D) gamma rays
C) ultraviolet radiation from the sun
How much can a technician be fined for venting a non-exempt refrigerant from a system? A) $14,439 per day per violation B) $27,539 per day per violation C) $37,839 per day per violation D) $44,539 per day per violation
D) $44,539 per day per violation
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 years
D) 5 years
Which is NOT a "refrigerant" as its used in EPA's regulations? A) A high GWP substance used only in a small household or commercial air conditioners B) A zero ODP HFC C) A zero ODP substitute; with a GWP under 1,000 that replaces Class I or Class II refrigerant D) A leak trace gas
D) A leak trace gas
Which refrigerant(s) 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
An oil sample might be taken when ________. A) Moisture and/or acid problems are suspected B) Oil sludge formation or oil waxing is suspected C) Residual acidic oil from a burn-out is suspected of contaminating the replacement oil D) All of the above
D) All of the above
How do scientists know that the chlorine in the stratosphere is not primarily 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 matches 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
In addition to the saturation pressure-temperature behavior of refrigerants, when considering a substitute refrigerant also consider _____. A) Cooling capacity B) Flammability and toxicity C) Materials compatibility 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% of capacity C) Always be labeled and secured in the vehicle D) All of the above
D) All of the above
What is the violation of the Clean Air Act of 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) All of the above
D) All of the above
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
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 is 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
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
Which of the following is classified as an A2L refrigerant? A) R-1234yf B) R-1234ze(E) C) R-32 D) All of the above are A2L refrigerants
D) All of the above are A2L refrigerants
_____ 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 the above
D) All 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 refrigerant inside to _____. A) Avoid accidental mixing of recovered refrigerants and allow a recycler to identify the contents B) Allow the technician's company to determine the amount of refrigerant recovered for recordkeeping purposes C) Determine if the refrigerant must be reclaimed or is clean D) Both A and B
D) Both A and B
The fill level of a recovery cylinder can be determine by _____ A) Mechanical-float or electronic shut-off devices B) The weight of the cylinder C) Shaking the cylinder to determine if there is liquid inside 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
When planning to recovery flammable refrigerants, always ensure that _____. A) The refrigerant is cooled at 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 a low-pressure vapor to a high-pressure vapor. A) Expansion valve B) Evaporator C) Accumulator D) Compressor
D) Compressor
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 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.
Which appliances are NOT covered by EPA regulations? A) Mini-fridges B) Ice makers C) Commercial refrigeration equipment D) Desiccant dehumidifiers
D) Desiccant dehumidifiers
Ozone depletion in the stratosphere is what type of problem? A) U.S. problem B) North American problem C) Arctic problem D) Global problem
D) Global problem
HFC refrigerants contain _______. A) Helium, fluoride, and chlorine B) Hydrazine, fluoride, and chlorine C) Helium, fluorine, and carbon D) Hydrogen, fluorine, and carbon
D) Hydrogen, fluorine, and carbon
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 new 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
Over-evacuation on a system can _____ A) Cause service hoses to collapse B) Damage a micron gauge C) Destroy a vacuum pump D) Never occur; you can never pull too much air or other impurities from a system
D) Never occur; you can never pull too much air or other impurities from a system
Ester-based oils like POE can be mixed with ____. A) PAG and mineral oils B) Paraffinic mineral oils C) Alkylbenzene oils D) No other oils
D) No other oils
Which refrigerant contains chlorine? A) R-12 B) R-1234yf C)R-134a D) None of them
D) None of them
_______ can be recovered into the same cylinder. A) Multiple refrigerant blends B) Only two refrigerants C) Any number of CFC refrigerants D) Only 1 refrigerant
D) Only 1 refrigerant
Which refrigerant can be purchased if you don't have EPA's 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 is NOT classified as an A3 refrigerant? A) Propane (R-290) B) Isobutane (R-600a) C) R-441A D) R-1234yf
D) R-1234yf
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
The high pressure gauge on a typical gauge manifold set is typically colored _____. A) black B) yellow C) blue D) red
D) Red
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 5/8 service connection C) Are always sized smaller than 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 refrigeration system as a _____. A) superheated liquid B) subcooled liquid C) subcooled vapor D) superheated vapor
D) Superheated vapor
_____ means that the refrigerant blend has a range of bubble or dew points at a constant pressure A) Saturation pressure (SPV) B) Saturation slope C) Fractionation slope D) Temperature glide
D) Temperature glide
How does the GWP of R-410 A 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 5 times lower D) The GWP of R-410A is thousands of times greater.
D) The GWP of R-410A is thousands of times greater.
________ is the only EPA SNAP approved "drop-in" replacement for R-22. A) R-407C B) R-1234yf C) Propane (R-290) D) There are no direct drop-in refrigerant substitutes.
D) There are no direct drop-in refrigerant substitutes.
What makes HFC refrigerants damaging to the environment? A) They contain fluorine, which damages the ozone layer. 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 can have very high global warming potentials.
When servicing a R-22 system you CANNOT ______. A) Add R-22 to top off the system after the repair is completed B) Retrofit the unit to R-407C C) Use recovered recycled R-22 from the same owner D) Top off the unit with R-407C
D) Top off the unit with R-407C
Always measure the final system vacuum _____. A) With the vacuum pump operating, gas ballast open, and micron gauge connected. B) With the vacuum pump operating, gas ballast closed, and micron gauge connected. C) With the system as warm as possible and the vacuum pump operating full speed D) With the system isolated from the vacuum pump
D) With the system isolated from the vacuum pump
The EPA refers to a "retrofit" as ______. A) an upgrade of the system's compressor B) an upgrade to either the evaporator or condenser C) any major system repair D) a conversion of the system to use a different refrigerant
D) a conversion of the system to use a different refrigerant
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
A refrigerant cylinder that has a gray body and a yellow top is designed to hold _____. A) only flammable refrigerants B) nitrogen C) R-22 or R407C D) recovered refrigerant
D) recovered refrigerant
Distributors must verify _____ before they can sell refrigerant? A) the quality of the refrigerant B) that the net weight on the refrigerant container is accurate C) that the purchaser owns a certified recovery device D) that the purchaser employs at least one Section 608 certified technician
D) that the purchaser employs at least one Section 608 certified technician
