Test EPA 608 : Core, Type I, II et III

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Les 15 questions en un coup d'œil

Tu préfères lire avant de jouer ? Toutes les questions de l'échantillon sont listées ci-dessous. Les réponses et les explications restent repliées tant que tu ne les ouvres pas.

1. 1. Which element, released when CFC molecules break apart in the stratosphere, destroys ozone?

   • A. Nitrogen
   • B. Chlorine
   • C. Carbon
   • D. Hydrogen
   Voir la réponse et l'explication

   Réponse : B. Chlorine

   Ultraviolet light breaks CFC molecules apart high in the atmosphere and frees chlorine atoms. One chlorine atom can destroy thousands of ozone molecules because it is not used up in the reaction, which is why even small releases matter and why the Montreal Protocol targeted chlorine-containing refrigerants first.

2. 2. Which list ranks refrigerant types from the highest to the lowest ozone depletion potential?

   • A. CFCs, then HCFCs, then HFCs
   • B. HCFCs, then CFCs, then HFCs
   • C. HFCs, then HCFCs, then CFCs
   • D. CFCs, then HFCs, then HCFCs
   Voir la réponse et l'explication

   Réponse : A. CFCs, then HCFCs, then HFCs

   CFCs such as R-12 contain the most chlorine and have the highest ozone depletion potential. HCFCs such as R-22 contain hydrogen, which makes them break down sooner in the lower atmosphere, so their potential is lower. HFCs such as R-134a and R-410A contain no chlorine, so they do not deplete ozone, although many of them are strong greenhouse gases.

3. 3. Complete the sentence.

   To _____ refrigerant means to reprocess it until it meets the purity specifications EPA sets for refrigerant sold for reuse, which must be confirmed by chemical analysis.

   Options pour le trou 1 : recover, recycle, reclaim, recharge

   Voir la réponse et l'explication

   Réponse : reclaim

   Recover means removing refrigerant from an appliance and storing it in an external container. Recycle means cleaning it, usually by separating oil and filtering, for reuse in equipment of the same owner. Reclaim is the only one that brings refrigerant back to new product specifications, and it is done by an EPA-certified reclaimer, not in the field.

4. 4. You need to pressurize a system to check for leaks. What should you use?

   • A. Oxygen from a welding cylinder
   • B. Compressed shop air
   • C. Dry nitrogen through a pressure regulator and relief valve
   • D. Liquid refrigerant charged until the system reaches full pressure
   Voir la réponse et l'explication

   Réponse : C. Dry nitrogen through a pressure regulator and relief valve

   Dry nitrogen is inert and contains no moisture. Oxygen can react violently with compressor oil and cause an explosion, and shop air brings in moisture and also contains oxygen. A nitrogen cylinder holds far more pressure than a system can take, so the regulator and relief valve are not optional.

5. 5. Which statements about the Clean Air Act venting prohibition are correct?

   Coche toutes les bonnes réponses.

   • A. Knowingly venting CFC or HCFC refrigerant during service, repair or disposal is prohibited.
   • B. The prohibition also covers HFC substitutes such as R-134a and R-410A.
   • C. Venting is allowed when a system holds less than 5 pounds of refrigerant.
   • D. Small de minimis releases that happen while you follow proper recovery practices are not a violation.
   • E. HFCs may be vented freely because they do not deplete ozone.
   Voir la réponse et l'explication

   Réponse : A. Knowingly venting CFC or HCFC refrigerant during service, repair or disposal is prohibited., B. The prohibition also covers HFC substitutes such as R-134a and R-410A., D. Small de minimis releases that happen while you follow proper recovery practices are not a violation.

   The prohibition applies at servicing and at disposal, and it extends to substitute refrigerants like HFCs, not only to ozone-depleting ones. What is tolerated is the unavoidable minimal release that happens during good-faith recovery, such as the small amount lost when you disconnect hoses. Charge size does not create an exemption, and small appliances must still be recovered.

6. 6. Why should a refrigerant cylinder never be filled to more than 80 percent of its capacity?

   • A. Because EPA charges a fee on cylinders that are full
   • B. Because refrigerant cannot be recovered after the cylinder passes 80 percent
   • C. Because the scale reading becomes inaccurate above 80 percent
   • D. Because liquid expands as it warms, and a cylinder with no vapor space left can rupture
   Voir la réponse et l'explication

   Réponse : D. Because liquid expands as it warms, and a cylinder with no vapor space left can rupture

   The space above the liquid gives it room to expand. If a full cylinder warms up, for example in a truck on a hot day, the liquid can fill the whole cylinder and hydrostatic pressure rises very fast. That is why recovery cylinders are weighed during filling, or have a float switch, and are never filled past 80 percent.

7. 7. Complete the sentence.

   Under Section 608, a small appliance is one that is fully manufactured, charged and hermetically sealed in a factory with _____ or less of refrigerant.

   Options pour le trou 1 : 1 pound, 2 pounds, 5 pounds, 10 pounds

   Voir la réponse et l'explication

   Réponse : 5 pounds

   The definition has two parts: 5 pounds or less, and factory sealed. A household refrigerator, a window air conditioner or a dehumidifier qualifies. A unit that is field-assembled does not, even if its charge is small, and working on small appliances is what Type I certifies you for.

8. 8. You are recovering refrigerant from a small appliance whose compressor does not run, using recovery equipment made after November 15, 1993. What is the minimum requirement?

   • A. Recover 100 percent of the charge
   • B. Recover 90 percent of the charge
   • C. Recover 80 percent of the charge, or evacuate to 4 inches of mercury vacuum
   • D. Recover 50 percent of the charge
   Voir la réponse et l'explication

   Réponse : C. Recover 80 percent of the charge, or evacuate to 4 inches of mercury vacuum

   With equipment made after that date, you must recover 90 percent of the charge when the appliance compressor works and 80 percent when it does not, or pull the appliance down to 4 inches of mercury vacuum in either case. A running compressor helps push refrigerant out, which is why the bar is higher when it works.

9. 9. When you recover from a small appliance with an inoperative compressor, why should you install access valves on both the high side and the low side?

   • A. Because refrigerant can stay trapped on one side of the system without a running compressor to move it
   • B. Because the law requires two valves on every appliance, whatever its size
   • C. Because a single valve would let air into the system
   • D. Because the high side valve is needed to add oil during recovery
   Voir la réponse et l'explication

   Réponse : A. Because refrigerant can stay trapped on one side of the system without a running compressor to move it

   A working compressor moves refrigerant through the system, so one access point can be enough. When it does not run, refrigerant can be held on either side of the metering device, and accessing both sides gets it out faster and more completely. Solderless piercing valves used for this should be removed when the job is done, because they tend to leak over time.

10. 10. Complete the sentence.

    System-dependent recovery equipment may not be used on an appliance with a full charge of more than _____ of refrigerant, unless it is a pump-out unit permanently attached to the appliance.

    Options pour le trou 1 : 5 pounds, 15 pounds, 50 pounds, 200 pounds

    Voir la réponse et l'explication

    Réponse : 15 pounds

    System-dependent equipment relies on the appliance's own compressor or pressure to move refrigerant, so it recovers too slowly and too incompletely for larger systems. Above 15 pounds you need self-contained recovery equipment, which has its own compressor and works without help from the appliance.

11. 11. A high-pressure appliance has a full charge of less than 200 pounds. Using recovery equipment made after November 15, 1993, to what level must you evacuate it before opening it?

    • A. 0 inches of mercury
    • B. 10 inches of mercury vacuum
    • C. 15 inches of mercury vacuum
    • D. 25 millimeters of mercury absolute
    Voir la réponse et l'explication

    Réponse : A. 0 inches of mercury

    For high-pressure appliances, EPA's evacuation table sets 0 inches of mercury for a charge under 200 pounds and 10 inches of mercury vacuum for 200 pounds or more, with modern recovery equipment. The 25 millimeters of mercury absolute level belongs to low-pressure appliances. After you reach the level, wait a few minutes and watch the gauges, because a rise in pressure means refrigerant is still in the system.

12. 12. Which of these are signs of a leak in a high-pressure system?

    Coche toutes les bonnes réponses.

    • A. Oily residue around a fitting or brazed joint
    • B. Head pressure holding steady at its normal reading
    • C. Bubbles forming in a soap solution brushed over a joint
    • D. An electronic leak detector alarming at one spot
    • E. A clean, dry joint with no residue
    Voir la réponse et l'explication

    Réponse : A. Oily residue around a fitting or brazed joint, C. Bubbles forming in a soap solution brushed over a joint, D. An electronic leak detector alarming at one spot

    Refrigerant carries compressor oil with it, so oil stains at a joint are the classic visual sign of a leak. Soap bubbles and an electronic detector confirm the exact spot. Before you charge or recharge equipment, leak test it, because adding refrigerant to a leaking system only releases more of it.

13. 13. On a large high-pressure system, why do technicians often start by recovering liquid refrigerant?

    • A. Because liquid recovery removes moisture from the system
    • B. Because liquid moves much more refrigerant in less time than vapor
    • C. Because vapor cannot legally be recovered
    • D. Because liquid recovery makes evacuation unnecessary
    Voir la réponse et l'explication

    Réponse : B. Because liquid moves much more refrigerant in less time than vapor

    The same volume of liquid holds far more refrigerant than vapor, so pulling liquid first removes most of the charge quickly. You still have to recover the vapor afterwards and reach the required evacuation level. Shorter hoses, larger diameter hoses and removing valve cores also speed up recovery.

14. 14. When you recharge a low-pressure chiller that has been evacuated to a deep vacuum, why do you add refrigerant vapor before liquid?

    • A. Because liquid would contaminate the purge unit
    • B. Because vapor is cheaper than liquid
    • C. Because the chiller can only be charged through the condenser
    • D. Because liquid boiling at very low pressure can freeze the water in the tubes
    Voir la réponse et l'explication

    Réponse : D. Because liquid boiling at very low pressure can freeze the water in the tubes

    At a deep vacuum, liquid refrigerant flashes and gets very cold, cold enough to freeze the water in the evaporator tubes and split them. Charging vapor first raises the pressure until the refrigerant's saturation temperature is above freezing, and then liquid can follow. Centrifugal chillers are charged through the evaporator charging valve.

15. 15. Which statements about low-pressure chillers are correct?

    Coche toutes les bonnes réponses.

    • A. They run at higher pressures than R-410A systems.
    • B. Because parts of the system run below atmospheric pressure, leaks let air and moisture in rather than letting refrigerant out.
    • C. A purge unit removes air and other noncondensables from the system.
    • D. Leak testing should be done by pressurizing the system with oxygen.
    • E. During refrigerant evacuation, the water in the tubes should be circulated or drained to prevent freezing.
    Voir la réponse et l'explication

    Réponse : B. Because parts of the system run below atmospheric pressure, leaks let air and moisture in rather than letting refrigerant out., C. A purge unit removes air and other noncondensables from the system., E. During refrigerant evacuation, the water in the tubes should be circulated or drained to prevent freezing.

    Low-pressure refrigerants such as R-123 boil just above room temperature at atmospheric pressure, so the evaporator of a running chiller sits in a vacuum and a leak pulls air in. That air and moisture raise pressure and cut efficiency, which is what the purge unit is there to remove. Water in the tubes can freeze as pressure drops during evacuation, so keep it moving or drain it.

Comment fonctionne l'examen EPA 608

La section 608 du Clean Air Act, la loi fédérale américaine sur la qualité de l'air, impose une certification à toute personne qui entretient, dépanne, répare ou met au rebut un équipement susceptible de libérer du fluide frigorigène. La règle est fédérale, donc la même certification vaut dans tous les États. Il existe quatre types de certification. Le Type I couvre les petits appareils, c'est-à-dire les appareils scellés en usine avec 5 livres (pounds) de fluide frigorigène ou moins, comme les réfrigérateurs domestiques et les climatiseurs de fenêtre. Le Type II couvre les équipements haute pression et très haute pression, ce qui inclut la plupart de la climatisation résidentielle et commerciale. Le Type III couvre les équipements basse pression, surtout les refroidisseurs centrifuges. Universal signifie que tu as réussi les trois types.

Chaque test comprend une section Core. Selon la règle de l'EPA, chaque test comporte au moins 25 questions du groupe Core et au moins 25 pour chaque type visé, donc un examen Universal compte 100 questions. Le score de réussite fixé par la règle est de 70 % pour les tests Type I, Type II, Type III et Universal passés sans documents, et de 84 % pour un test Type I passé par courrier. Les Type II et Type III doivent se passer sans documents, devant un surveillant. Un test Type I par courrier, ou une section Core passée avec documents, ne peut pas compter pour Universal.

L'EPA n'organise pas l'examen et n'imprime pas elle-même les cartes. Tu passes le test auprès d'un organisme de certification agréé par l'EPA, qui délivre une carte format portefeuille sous 30 jours. La certification n'expire pas, et tu dois garder une copie de ton certificat sur ton lieu de travail. Les prix, les dates et la possibilité de passer le test en ligne dépendent de l'organisme choisi. Un point qui surprend souvent : la climatisation automobile ne relève pas de la section 608. Les travaux de climatisation sur les véhicules relèvent de la section 609, qui est une certification distincte.

Comment utiliser cet échantillon

Les 15 questions suivent l'ordre de l'examen : six questions Core, puis trois pour le Type I, quatre pour le Type II et deux pour le Type III. Si tu ne passes que Core et Type I, fais-les quand même toutes, car les questions Type II sur la vitesse de récupération et les signes de fuite sont des connaissances utiles pour tout technicien.

Trois sujets méritent une attention particulière. Le premier, ce sont les trois R, recover, recycle et reclaim (récupérer, recycler et régénérer), faciles à confondre. Le deuxième est le tableau d'évacuation, où le vide exigé dépend du type d'appareil, de sa charge et de la date de fabrication de ton équipement de récupération. Le troisième est la sécurité, surtout l'azote par rapport à l'oxygène et la limite de remplissage des bouteilles à 80 %. Si tu rates l'un d'eux ici, revois tout le sujet, pas seulement le fait isolé.

Certains chiffres de l'examen ont changé au fil des années, notamment les seuils de réparation des fuites, les dates d'élimination progressive et l'amende maximale, et de nouvelles règles issues de l'AIM Act couvrent désormais aussi les équipements aux HFC. Cet échantillon teste les notions derrière ces règles plutôt que des chiffres qui bougent. Avant ton examen, vérifie les exigences en vigueur sur les pages EPA Section 608 d'epa.gov et dans le manuel d'étude de ton organisme de certification.

Comment StudyPDF crée des tests EPA 608 complets à partir de ton manuel

Quinze questions peuvent te montrer quelle section est fragile. Elles ne peuvent pas couvrir un examen Universal de 100 questions, et une banque de questions générique correspond rarement au manuel d'étude que te remet ton organisme de certification.

StudyPDF part plutôt de ton matériel. Importe ton manuel d'étude EPA 608, les diapos de ton école professionnelle ou des photos de tes notes de cours, appuie sur Nouveau support, et StudyPDF crée des examens blancs à partir de ces pages précises, découpés en sections comme le vrai test et corrigés à la fin. Chaque question s'appuie sur ton matériel et chaque explication cite l'endroit d'où vient la réponse.

Tu n'as pas besoin de document pour commencer. Nomme plutôt un sujet, par exemple la récupération en Type III ou les trois R, et Bo le prépare avec ses notions clés pour que tu puisses créer des quiz dessus. Tes résultats repèrent les notions que tu rates sans arrêt, pour que le prochain quiz puisse les cibler. Commencer est gratuit, et le forfait gratuit couvre environ quatre supports par semaine.