EPA 608 Certification Exam Questions and answers

EPA 608 Certification Exam Questions and answers Ozone depletion is caused by _ in HCFC refrigerants - ANSWERS Chlorine CFCs and HCFCs _ making them capable of reaching the stratospheric ozone - ANSWERS do not dissolve in water or easily break down in the atmosphere How many ozone molecules are destroyed by one chlorine atom - ANSWERS 100,000 ozone molecules The stratospheric ozone layer protects us from _ - ANSWERS ultraviolet radiation from the sun Which health effect increases from loss of the stratospheric ozone layer - ANSWERS Cases of cataracts and skin cancer Which of the following proves that HCFCs are in the stratosphere - ANSWERS HCFCs found in air samples from the stratosphere What makes HFC refrigerants damaging to the environment - ANSWERS They have very high global warming potentials _ makes HFO refrigerants less flammable than HC refrigerants - ANSWERS Fluorine Which refrigerant contains chlorine - ANSWERS R12 HFO refrigerants are miscible in _ lubricants. - ANSWERS POE lubricants An example of an HCFC refrigerant is - ANSWERS R-123 What is being done in the U.S. to stop damage to the stratospheric ozone layer - ANSWERS Eliminating the use of CFCs and HCFCs refrigerants EPA regulations require appliances to have _ - ANSWERS a service aperture or process stub The release of any CFC, HCFC, or HFC refrigerant during _ is illegal. - ANSWERS theft of equipment _ is the only EPA SNAP approved "drop-in" replacement for R-22. - ANSWERS There are no direct drop in refrigerant substitutes Ester-based oils like POE can be mixed with _ - ANSWERS no other oils What provides the cooling in a vapor compression refrigeration system - ANSWERS the vaporization of the liquid refrigerant An oil sample might be taken when _ - ANSWERS moisture and/or acid problems are suspected oil sludge formation or oil waxing is suspected residual acidic oil from a burn-out is suspected of contaminating the replacement oil _ returns refrigerant to new product specifications and requires chemical analysis to verify the purity to AHRI-700 standards - ANSWERS Reclaiming the EPA considers _ the most effective for locating the general area of a small leak - ANSWERS electronic or ultrasonic tester Low ambient temperatures _ recovery time. - ANSWERS increase A system is considered dehydrated when - ANSWERS a micron-gauge shows you have reached and held a vacuum of 500 microns or less with the vacuum pump isolated from the system If corrosion is discovered in the body of a relief valve, the valve must be _ - ANSWERS replaced The fill level of a recovery cylinder can be determined by _ - ANSWERS Mechnical float, electronic shut off devices, or the weight of a cylinder Before recharging any flammable hydrocarbon or HFO refrigerant, always _ - ANSWERS Electronically ground the recovery machine and recovery tank and verify the system is grounded and 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 A small appliance is defined as a system that is - ANSWERS manufactured, fully charged, and hermetically sealed in a factory with a charge of 5 pounds or less _ is an approved refrigerant for new household refrigerators, freezers, and combination refrigeration/freezers - ANSWERS R-600a the hydrocarbon refrigerant approved for retrofit into existing household refrigerators is - ANSWERS none, hydrocarbons are not approved for any retrofit applications Recovery devices for use with small appliances must be capable of - ANSWERS recovering 90% of the refrigerant when the compressor is operating Recovery equipment is certified by - ANSWERS An EPA approved laboratory When recovering refrigerant from small appliances you must recover - ANSWERS at least 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with an operative compressor The sale of reclaimed CFC, HCFC, HFC, and HFO refrigerants is _ - ANSWERS restricted to technicians who are EPA certified in refrigerant recovery a process stub is a_ - ANSWERS straight piece of tubing that is entered using a piercing access valve Small appliances requires a_ or Universal certification - ANSWERS Type 1 If a recovery cylinder is suspected to be contaminated, measure the _ - ANSWERS pressure of the refrigerant in the cylinder You must know the _ before beginning a refrigerant recovery. - ANSWERS type of refrigerant that is in the system when installing an access fitting _ - ANSWERS the fitting should be verified as leak free before beginning any recovery to avoid drawing air into the recovery tank A passive system-dependent recovery device for small appliances: - ANSWERS uses a non pressurized container when recovering refrigerant using a passive recovery system and the system has an inoperative compressor it is - ANSWERS helpful to heat and strike the compressor with a rubber mallet to release any refrigerant trapped in and under the compressor oil what requires accessing both the high and low side of the system for refrigerant recovery when using a passive recovery process - ANSWERS when the compressor does not run What is the pressure of a storage cylinder of R-134a that is stored in a room where the temperature is 100 F - ANSWERS 124 psig Recovery of refrigerant cannot begin if the initial pressure of the system is _ - ANSWERS 0 psig What maintenance practice should be performed on a regular basis - ANSWERS Change the vacuum pump oil, and check the recovery equipment and manifold hose set for leaks Which refrigerants can be mixed in a system - ANSWERS Refrigerants cannot be mixed