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EPA 609 Practice
Practice MVAC questions (test includes content from EPA 608 core)
| Question | Answer |
|---|---|
| Which component of CFC refrigerant is cause of ozone depletion? | chlorine |
| Stratospheric ozone layer protects us from: | ultraviolet radiation |
| Current standard for recovery only equipment is SAE: | J2810 |
| When checking cylinder of recycled HFC-134a for non-condensable gases at 70 degrees F, pressure should not exceed: | 76psig |
| Section 609 of Federal Clean Air Act requires that all persons servicing motor vehicle air conditioning must: | all of above (use EPA approved equipment, be certified in recovery procedures, and never intentionally vent refrigerant) |
| Recovery cylinders must be: | UL or DOT approved |
| After charging system using manifold gauges, refrigerant in hoses: | must be recovered |
| Violations of Section 609 of Clean Air Act may result in: | all of above ($27,500 fine per violation, loss of technician certification, and appearance in Federal Court) |
| After initial recovery procedures, technician should: | wait 5 minutes to determine if system returns to positive pressure |
| After initial recovery procedure, if additional recovery is required, repeat recovery process until A/C system vacuum remains stable for: | 2 minutes |
| Before retrofitting motor vehicle air conditioning system, make sure that replacement refrigerant is: | EPA - SNAP approved |
| Before charging system with recycled refrigerant, refrigerant should be checked for: | non-condensables |
| Service hoses must have what within 12” (30cm) of end of hose? | shut off valves |
| When disposing of empty or near empty disposable cylinder, you should: | all of above (attach cylinder to recovery unit, reduce cylinder to vacuum, and mark cylinder empty) |
| Prior to introducing recovered refrigerant to motor vehicle: | recycle refrigerant to SAE standards (J1991 or J2099) |
| Refrigerant must not be vented because: | all of above (it is illegal and expensive as well as depletes the ozone layer) |
| Before transferring recycled refrigerant into empty storage cylinder, cylinder should first be: | evacuated to at least 27” Hg |
| One kilogram is equal to: | 2.2 pounds |
| Recycling equipment manufactured to SAE standards is capable of cleaning refrigerants to acceptable level: | only if it came from motor vehicle |
| Recovery cylinders must not be filled above 80% of their capacity and safe filling capacity can be controlled by: | any of above (mechanical float devices, electronic shut-off, or weight (scales)) |
| When servicing vehicle charged with HFC-134a, you should: | use equipment designed for use with HFC-134a |
| Before charging system that has been opened for service: | system should hold 27” vacuum for at least one minute before charging |
| Refillable cylinders used to transport recovered refrigerants: | all of above (must be DOT approved, properly labeled and tagged, along with hydrostatically tested every 5 years) |
| When leak is found in automotive air conditioning system: | all of above (EPA does not require leak repair, leak repair is mandatory in some states, and repair leaks whenever possible) |
| Depletion of ozone layer causes: | all of above (skin cancer, eye disease, and crop loss) |
| Only accurate method of charging is to: | weigh refrigerant into system |
| Which of following refrigerants has lowest GWP? | R-744 (carbon dioxide) |
| All devices used to recover/recycle refrigerant must: | meet EPA standards |
| Lubricant used with HFC-134a is: | PAG or POE (ester) oil |
| Why are you not allowed to retrofit R-134a system to R-744? | R-744 systems operate at 7 to 10 times higher system pressure than R-134a |
| Never expose CFC-12 to open flame because they may form: | all of above (hydrochloric and hydrofluoric acids plus phosgene gas) |
| Definition of recover: | remove refrigerant in any condition, from system, and store it in external container |
| When operating recovery or recycling equipment, you should: | all of above (wear safety glasses and protective gloves along with follow all safety precautions for equipment) |
| Definition of recycle: | clean refrigerant for reuse by oil separation and passes through moisture absorption device |
| Definition of reclaim: | process refrigerant to level equal to new product specifications as determined by chemical analysis |
| Failure of system to hold vacuum concluding evacuation process indicates that: | leak in system may exist |
| Under what conditions may you use disposable cylinder to recover refrigerant? | never |
| Refrigerant oil that is hygroscopic: | has high affinity for water |
| Recovery of refrigerants is necessary for: | all of above (adequate supplies for service after production bans as well as prevention of stratospheric ozone depletion and venting to atmosphere) |
| Award of up to what amount may be paid to person supplying information that leads to penalty against technician who is intentionally venting? | $10,000 |
| When retrofitting CFC-12 system to HFC-134a: | all of above (replace accumulator/drier with one that contains XH-7 or XH-9 desiccant, affix HFC-134a label to system, and recover any remaining CFC-12) |
| Recycling equipment that shares common refrigerant circuit for both CFC-12 and HFC-134a must be certified to what standard? | SAE J1770 |
| R-152a has GWP of: | 120 to 140 |
| Proper method of charging blended refrigerant is in: | liquid phase |
| High compression ratio may result in: | compressor failure |
| Gauge pressure of how many psig is required during leak testing? | 50psig |
| Montreal Protocol is: | international treaty controlling CFCs and HCFCs |
| One chlorine atom in atmosphere can destroy up to how many ozone molecules? | 100,000 |
| Which of following is considered to be good service practice? | all of above (repair leaks whenever possible, recover and recycle refrigerant, and determine type of refrigerant in system before recovery) |
| Never inhale refrigerant vapors or mist in high concentrations because: | they may cause heart irregularities or unconsciousness |
Created by:
hm2795
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