EPA 608 Exam Practice Questions 1-100 (Answered)

Ozone depletion is caused by _______ in HFC refrigerants. - ANSWER chlorine CFCs and HCFCs ________ making them capable of reaching the stratospheric ozone layer. - ANSWER do not dissolve in water or easily break down ...

Ozone depletion is caused by _______ in HFC refrigerants. - ANSWER chlorine CFCs and HCFCs ________ making them capable of reaching the stratospheric ozone layer. - ANSWER do not dissolve in water or easily break down in the atmosphere According to the Rolanda-Molina theory, ________ are destroyed by each chlorine atom in the stratosphere. - ANSWER 100,000 ozone molecules The stratospheric ozone layer protects us from _______. - ANSWER ultraviolet radiation from the sun Which health effect increases from loss of the stratospheric ozone layer? - ANSWER cases of cataracts or skin cancer What proves that HCFCs are in the stratosphere? - ANSWER HCFCs found in air samples from the stratosphere. What makes HFC refrigerants damaging to the environment? - ANSWER They can have very high global warming potentials. _______ makes HFO refrigerants less flammable than HC refrigerants. - ANSWER Flourine Which refrigerant contains chlorine? - ANSWER R-12 HFO refrigerants are miscible in _______ lubricants. - ANSWER POE lubricants An example of HcFC refrigerant is: ______ - ANSWER R-123 What is being done in the U.S. to stop damage to the stratospheric ozone layer? - ANSWER Eliminating the use of CFCs and HCFCs refrigerants EPA regulations require appliances to have _________. - ANSWER a service aperture or process hub The release of any CFC, HCFC, or HFC refrigerant during _________ is illegal. - ANSWER theft of equipment ____________ is the only EPA SNAP approved "drop in" replacement for R-22. - ANSWER There are no direct drop-in refrigerant substitutes Ester-based oils like POE can be mixed with ________. - ANSWER no other oils What provides the cooling in a vapor compression refrigeration system? - ANSWER The vaporization of the liquid refrigerant An oil sample might be taken when __________. - ANSWER 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 ________ returns refrigerant to new product specifications and requires chemical analysis to verify the purity to AHRI-700 standards. - ANSWER reclaiming The EPA considers _________ the most effective for locating the general area of a small leak. - ANSWER electronic or ultrasonic tester Low ambient temperatures __________ recovery time. - ANSWER increase A system is considered dehydrated when _________. - ANSWER 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 _______. - ANSWER replaced The fill level of a recovery cylinder can be determined by __________. - ANSWER a. mechanical-float or electronic shut-off devices b. the weight of the cylinder Before recharging any flammable hydrocarbon or HFO refrigerant, always ___________. - ANSWER a. electronically 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 A small appliance is defined as a system that is __________. - ANSWER 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. - ANSWER R-600a The hydrocarbon refrigerant approved for retrofit into existing household refrigerators is __________. - ANSWER none. Hydrocarbons are not approved for any retrofit applications Recovery devices for use with small appliances must be capable of ________. - ANSWER recovering 90% of the refrigerant when's the compressor is operating Recovery equipment is certified by _________. - ANSWER an EPA-approved laboratory When recovering refrigerant from small appliances, you must recover _________. - ANSWER 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 ___________. - ANSWER restricted to technicians who are EPA certified in refrigerant recovery A process stub is a ________. - ANSWER straight piece of tubing that is entered using a piercing access valve Small appliance servicing requires a _________ or Universal certification. - ANSWER Type I If a recovery cylinder is suspected to be contaminated, measure the ___________. - ANSWER pressure of the refrigerant in the cylinder You must know the ___________ before beginning a refrigerant recovery. - ANSWER type of refrigerant that is in the system When installing an access fitting, _____________. - ANSWER 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 process _________. - ANSWER uses a non-pressurized container When recovering refrigerant using a passive recovery system and the system has an inoperative compressor, it is __________. - ANSWER helpful to heat and stretch the compressor with a rubber mallet to release any refrigerant trapped in and under the compressor oil What requires access in both the high and low side of the system for refrigerant recovery when using a passive recovery process? - ANSWER 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? - ANSWER 124 psig Recovery of refrigerant cannot begin if the initial pressure in the system is _______. - ANSWER 0 psig