EPA 608 Type II — high-pressure: free practice test

25 questions · Type II — high-pressure. Pick an answer for each, then check. Explanations cite the rule each question tests.

1. 1. A high-pressure appliance uses a refrigerant with a boiling point between:

   Below −50°C−50°C and 10°C at atmospheric pressure10°C and 50°CAbove 50°C

2. 2. For a high-pressure appliance with more than 200 lb of charge using recovery equipment made after 11/15/1993, the required evacuation level is:

   0 psig10 in Hg vacuum15 in Hg vacuum25 in Hg vacuum

3. 3. For an HCFC-22 appliance of 200 lb or less, the required evacuation level (post-1993 equipment) is:

   0 psig (0 in Hg)10 in Hg15 in Hg25 in Hg

4. 4. If the system will be opened for a minor repair and leaks would prevent reaching the required vacuum, you may evacuate to:

   Atmospheric pressure (0 psig) before opening5 in HgThe normal level regardlessYou may vent the remainder

5. 5. Which recovery method removes refrigerant fastest from a large high-pressure system?

   Vapor recovery onlyLiquid recovery / push-pull method first, then vaporPassive recoveryRecovering through the filter-drier

6. 6. Under the 2016 amendments (as modified in 2020), commercial refrigeration appliances with 50 lb or more of ozone-depleting refrigerant must have leaks repaired when the annual leak rate exceeds:

   10%20%30%35%

7. 7. Comfort-cooling appliances (50 lb+ ODS) must be repaired when the leak rate exceeds:

   10%15%20%35%

8. 8. The pressure-temperature relationship is used in Type II work to:

   Calculate the oil chargeIdentify refrigerant and detect non-condensables in a cylinderSet the superheat onlyDetermine the DOT cylinder rating

9. 9. Before charging a system that has been open to the atmosphere, the technician should:

   Purge with R-22Evacuate to 500 microns or the manufacturer's specification with a vacuum pumpPressurize with compressed airAdd oil and run the compressor

10. 10. Which is a safe practice when recovering from a system with a burned-out hermetic compressor?

    Use the same recovery machine oil for the next job without changing itChange the recovery unit's oil and filter-drier after the job because the refrigerant is acidicVent the charge — it is contaminated anywayRecover through the suction line only at high speed

11. 11. Refrigerant leaving the appliance as a liquid during recovery should be routed so that:

    It enters the recovery unit's compressor directlyIt goes to the recovery cylinder (or through a liquid-capable path) and not into the recovery compressorIt passes through the vacuum pumpIt is flashed to vapor by venting

12. 12. Which component must be replaced when a system is opened and moisture may have entered?

    The condenser fanThe filter-drierThe rupture diskThe purge unit

13. 13. For appliances with 50 lb or more of ozone-depleting refrigerant, once a leak above the applicable threshold is discovered, repairs generally must be completed within:

    24 hours30 days (with extensions possible for industrial process shutdown requirements)6 months1 year

14. 14. After repairing a leak on a 50+ lb ODS appliance, the technician must perform:

    Nothing furtherAn initial verification test, and a follow-up verification test with the system at normal operating conditionsA complete retrofitAn oil change

15. 15. Speeding up recovery from a large high-pressure system is legitimately done by:

    Heating the recovery cylinderPacking the recovery cylinder in ice or pre-chilling it, and recovering liquid firstVenting vapor to lower pressureRemoving the cylinder's relief valve

16. 16. Recovery equipment used on high-pressure appliances must be certified by an EPA-approved organization and must be:

    Painted gray and yellowKept leak-free, with its own service performed per the manufacturer, and used with the required evacuation levels of Appendix BOwned by the building ownerRe-certified monthly

17. 17. A technician measures cylinder pressure well above the P/T chart value for the labeled refrigerant at the measured temperature. The correct action is:

    Use it anywaySuspect non-condensables or a mixed refrigerant; do not use it for charging — send it for reclamation/analysisVent the excess pressureCool it and use it

18. 18. When a system's liquid line filter-drier has a sight glass with a moisture indicator showing 'wet', the technician should:

    Ignore it if cooling worksRecover, replace the drier, evacuate to a deep vacuum, and rechargeAdd more refrigerantAdd alcohol as a dryer

19. 19. In a system with a receiver, the fastest legitimate way to remove most of the charge before a low-side repair is:

    Venting the low sidePumping the charge into the receiver/condenser (pump-down) using the system's own compressor where design allows, then recovering the remainderRemoving the compressorOpening the king valve to atmosphere

20. 20. Which gauge-manifold practice avoids mixing refrigerants between jobs?

    Using one hose set for everythingDedicated hoses/manifolds per refrigerant family, purging hoses into the system or recovery unit, and never topping mixed chargesBlowing hoses out with shop airRinsing hoses with water

21. 21. An open (non-hermetic) compressor that has sat unused for months most commonly leaks at:

    The suction valveThe rotating shaft seal, which dries outThe oil plugThe terminal box

22. 22. Where must refrigerant vapor be drawn from to complete recovery after liquid has been removed by push-pull?

    Nowhere — liquid removal is enoughFrom the system with the recovery unit until the required Appendix B vacuum is reachedFrom the recovery cylinderFrom the purge unit

23. 23. Evacuating a system to 500 microns and watching the micron gauge rise quickly to a plateau then hold indicates:

    A leakMoisture still boiling off (rise then plateau below atmospheric) — continue dehydrationA perfect vacuumNon-condensables in the cylinder

24. 24. The sight glass in the liquid line bubbles continuously at steady load. Among refrigerant-side causes, this most commonly indicates:

    OverchargeUndercharge or restriction ahead of the sight glass (flashing)Too much oilA failed fan capacitor only

25. 25. When retrofitting an R-22 system to a 400-series HFC blend, which step is required for reliable operation?

    Keep the mineral oilReplace mineral oil with the OEM-specified POE (often multiple flushes), replace the drier, and label the system with the new refrigerantMix old and new refrigerantRemove the TXV