CFC Core Exam Questions with 100% correct Answers

__are fluorocarbon refrigerants that cause no harm to stratospheric ozone. A.CFCS B.HCFCS C.HFCs D.HalonsTM - Answer- C 2.The Clean Air Act_. A.calls for the phaseout of PFC refrigerant production B.requires that all leaks be fixed within 30 days C.requires OSHA to set standards for the recovery of refrigerants prior to appliance disposal D.prohibits CFC/HCFC venting as of July 1,1992 - Answer- D 3.Refrigerant__is the type of contamination that is the most difficult for a reclaiming facility to eliminate. A.with air B.with moisture C.from an acid burnout D.containing particulate contaminants - Answer- C __is a CFC refrigerant. A.R-134a B.R-123 C.R-22 D.R-12 - Answer- D _is an HCFC refrigerant. A.R-11 B.R-22 C.R-114 D.R-717 - Answer- B __is an HFC refrigerant. A.R-134a B.R-115 C.R-22 D.R-11 - Answer- A The strongest evidence that CFCs are in the stratosphere is_. A.theory only B.measurements of CFCs in air samples from the lower atmosphere C.measurements of CFCs in air samples from the stratosphere D.measurements of other man-made compounds in air samples from the stratosphere - Answer- C Ozone depletion in the stratosphere is a__problem. A.local B.regional C.national D.global - Answer- D The ozone layer protects the planet's surface from_. A.losing oxygen B.chlorine monoxide C.UV radiation D.hydrogen chloride - Answer- C One of the most serious results of damage to the ozone layer is. A.increased growth of marine plants B.increased volcanic activity C.increases in human skin cancer D.higher natural background radioactivity - Answer- C The size(capacity)of a vacuum pump and suction line size determine A.vacuum polarity B.evacuation time C.refrigerant used D.oil viscosity - Answer- B __is the element in refrigerants that causes ozone depletion. A.Fluorine B.Chlorine C.Carbon D.Hydrogen - Answer- B Some state and local governments may establish laws that_. A.counteract EPA regulations B.are not as strict as the Clean Air Act and EPA regulations C.contain stricter regulations than the Clean Air Act and EPA regulations D.supersede EPA regulations - Answer- D Whenever dry nitrogen from a portable cylinder is used in service and installation practice,the most important safety consideration is that. A.the regulator has a new set of gauges B.the gauges are clean C.a relief valve is inserted in the downstream line from the pressure regulator D.no refrigerant lines can leak - Answer- C Personal protective equipment(gloves,safety glasses,safety shoes,etc.)must be wom when. A.reporting for work B.handling and filling refrigerant cylinders C.climbing ladders D.lifting - Answer- B __is a chlorine-free refrigerant. A.HFC-134a B.CFC-2 C.HCFC-22 D.HCFC-124 - Answer- A When leak checking a unit that has lost a complete charge,__is/are the gas(es)that 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-12 - Answer- C When evacuating a system,the use of a large vacuum pump could cause_to freeze. A.trapped oil B.trapped refrigerant C.trapped water D.valves - Answer- C In order to verify the allowable refrigeration system test pressure,check A.with the equipment owner or representative B.refrigerant pressure tables C.the design pressure on the equipment nameplate D.with the local utility company - Answer- C To determine the safe pressure for leak testing a system,a technician should use_. A.low-side test-pressure data-plate value B.discharge operating pressure C.ambient+300temperature/pressure value D.ambient at standby condition - Answer- A __is a gas that helps form a protective shield around the Earth. A.Methane B.Radon C.Stratospheric ozone D.Carbon dioxide - Answer- C Refrigerant entering the compressor of a refrigeration system is a. A.liquid B.subcooled liquid C.subcooled vapor D.superheated vapor - Answer- D The state of refrigerant leaving the condenser of a refrigeration system is. A.low-pressure liquid B.low-pressure vapor C.high-pressure liquid D.high-pressure vapor - Answer- C Failure of a system to hold a vacuum at the end of the evacuation process indicates that_. A.the system is ready to be charged B.the system has been adequately evacuated C.a leak in the system exists D.the feed device is plugged - Answer- C A system is said to be dehydrated when. A.the vacuum indicator shows that the required finished vacuum has been reached and held B.the vacuum pump has run for at least 12 hours C.the manifold suction gauge has held 30 in.Hg vacuum for 2 hours D.you are ready to leave for the day - Answer- A __have the highest ozone depletion potential(ODP). A.HCFCS B.HFCS C.CFCS D.Mineral oils - Answer- C When__is found in the upper stratosphere,it indicates that the ozone layer is being destroyed. A.carbon monoxide B.nitrous oxide C.trioxide D.chlorine monoxide - Answer- D Of the following refrigerants,__has the lowest ODP. A.R-22 B.R-123 C.R-134a D.R-502 - Answer- C __are an effect of stratosphere ozone depletion on the environment. A.Volcanic eruptions B.Chlorine compounds C.Visible light distortions D.Reduced crop yields - Answer- D The recovery of refrigerants is necessary to. A.sell appliances B.stop Legionnaires'disease from spreading C.give refrigerants low ODP additives D.provide adequate supplies for service after production bans are in effect - Answer- D To stop damage to the stratospheric ozone layer,the United States is. A./using ground level ozone to rebuild the ozone layer B.stopping the production and regulating the use of CFCs C.moving away from CFCs and toward Halons TM D.stopping the production of HFC and HCFC refrigerants - Answer- B Equipment covered by EPA regulations includes. A.only refrigerators and freezers B.all air conditioning and refrigeration equipment containing and using CFC refrigerants C.all air conditioning and refrigeration equipment containing and using CFC and HCFC refrigerants D.only commercial air conditioning and refrigeration equipment - Answer- C he EPA classifies-as a"low-pressure refrigerant." A.R-134a B.R-123 C.R-22 D.R-500 - Answer- B A ternary blend of retrigerants can be described as a(n)__mixture. A.azeotropic B.two-part C.three-part D.four-part - Answer- C Chlorofluorocarbons(CFCs)and hydrochlorofluorocarbons(HCFCs)are similar in that__. A.they have the same ozone depletion potential B.they both contain hydrogen C.both must be recovered before opening or disposing of appliances D.they have the same saturation pressure at 700F - Answer- C During the servicing of a refrigeration system containing R-12,the refrigerant must be_. A.replaced with R-134a B.recovered C.vented D.destroyed - Answer- B The oils that are used with most HFC-134a refrigerant applications are_. A.esters B.alkylbenzenes C.whale oils D.all oils are compatible with HFC-134a - Answer- A _is the removal of refrigerant in any condition from a system and storing the refrigerant in an external container without necessarily testing or processing the refrigerant in any way. A.Recycling B.Recovering C.Reclaiming D.Restoring - Answer- B The high-pressure gauge on a service manifold set has a continuous scale,typically calibrated to read from__to A.500 microns;O psig B.O psi;200 psi C.O psi;500 psi D.250 psi;750 psi - Answer- C On a typical gauge manifold set,the high-pressure gauge is color-coded. A.green B.yellow C.blue D.red - Answer- D _is a safety precaution that must be followed. A.Storing cylinders in direct sunlight at a temperature of more than 125 B.Storing recovered refrigerant in new DOT refrigerant cylinders C.Shipping refrigerant cylinders in the horizontal position D.Refraining from using oxygen to purge lines or pressurize systems - Answer- D Since 1995,supplies of CFC refrigerants for equipment servicing come from__. A.recovery and recycling B.solvent conversion C.European chemical manufacturers D.third world chemical manufacturers - Answer- A __results in violation of the Clean Air Act. A.Using dry nitrogen to pressurize systems B.Having a cylinder that is clearly marked with the chemical name C.An accusation of misconduct D.Failing to reach required evacuation levels betore opening or disposing of appliances - Answer- D An award of up to$__may be paid to a person supplying inrormation that leads to penalties against a technician who is intentionally venting. A.5000 B.10,000 C.25,000 D.50,000 - Answer- B Proper disposal of refrigerant cylinders is accomplished by_. A.bleeding refrigerant to ambient air and throwing the cylinders into a trash dumpster B.ensuring that all refrigerant is recovered and that the cylinders are rendered useless,then recycling the metal C.refilling the cylinders a second time at an approved facility D.giving the cylinders to a reclaiming facility for reuse - Answer- B Before a technician disposes of any appliance containing a CFC or HCFC refrigerant,the technician must. A.recover the refrigerant B.purge the appliance with nitrogen C.flush the appliance with R-11 D.seal the appliance so no refrigerant can escape - Answer- A Blended refrigerants must be charged. A.as a vapor B.at very high temperatures C.by weight into the high-pressure side of the system as a liquid D.the same as any other refrigerant - Answer- C Blended refrigerants leak from a system_. A.at a faster rate than other refrigerants B.in uneven amounts due to different vapor pressures C.at a slower rate than other refrigerants D.only if the line breaks completely - Answer- B Refrigerant will migrate to the crankcase of a compressor because of the difference in_between the oil and the refrigerant. A.vapor pressure B.acidity C.volume D.density - Answer- D Recycling is to A.remove refrigerant,in any condition,from a system and store it in an external container, without necessarily testing it or processing it in any way B.process refrigerant to a level equal to new product specifications and test it to verify purity C.clean refrigerant by oil separation and single or multiple passes through moisture-absorption devices and then reuse the refrigerant D.remove refrigerant from job site for disposal - Answer- C While servicing a system,a technician discovers that R-502 refrigerant was added to a system with R-22 refrigerant.The technician must. A.vent the refrigerant since it cannot be reclaimed B.recycle the refrigerant C.recover the refrigerant into a separate tank D.recover and use the refrigerant in another system - Answer- C A factor affecting the speed of evacuation is the_. A.boiling temperature of the refrigerant B.manufacture date of the HVAC equipment C.condenser location D.diameter of the hoses - Answer- D When operating refrigerant recovery or recycling equipment,__is a safety precaution that must be followed. A.using standard colored hoses B.keeping the high-pressure(red)valve open at all times C.having the relief valve at the highest point in the system D.wearing protective gloves - Answer- D A refrigerant label is placed on a. A.refrigerant cylinder to be returned for reclaiming B.truck to identify the cylinder hauler C.cylinder to identify gross weight D.cylinder to identify pressure - Answer- C According to the EPA,it has been illegal to vent substitutes for CFC and HCFC refrigerants since A.July 1,1992 B.July 1,1993 C.November,1993 D.November,1995 - Answer- D The Montreal Protocol is. A.a treaty among nations that controls production of chlorofluorocarbons and hydrochloro- fluorocarbons B.a test for energy efficiency adopted by the Canadian government C.a procedure for measuring levels of CFCs in the atmosphere D.a test for ozone concentration - Answer- A "System-dependent"recovery devices_. A.are hermetically sealed units requiring spe