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Core Concepts and Principles Flashcards

7 cards from real EPA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Core Concepts and Principles flashcards as text

  1. What is the correct definition of 'recycling' refrigerant under EPA rules?

    Answer: Cleaning refrigerant for reuse by oil separation and passes through filter-driers

    Recycling cleans refrigerant with oil separation and filter-driers to reduce moisture, acidity, and particulates.

  2. Refrigerant recovered from a system may be charged into another system without reclaiming only when:

    Answer: The other system is owned by the same owner

    Recovered refrigerant may go back into the same system or another system belonging to the same owner without reclamation.

  3. Recovered refrigerant sold to a new owner must first be:

    Answer: Reclaimed to AHRI 700 standards by an EPA-certified reclaimer

    Refrigerant changing ownership must be reclaimed to AHRI Standard 700 purity.

  4. What should a technician do with a cylinder containing a mixture of two different refrigerants?

    Answer: Store it in a separate cylinder; it may need to be destroyed

    Mixed refrigerants usually cannot be reclaimed and may have to be destroyed at great cost.

  5. Which type of refrigerant blend can fractionate and has temperature glide?

    Answer: Zeotropic blend (400 series)

    Zeotropic blends like the 400 series change composition and temperature as they evaporate or condense.

  6. To prevent fractionation, how should zeotropic blends normally be charged into a system?

    Answer: As liquid

    Charging zeotropes as liquid keeps the blend composition correct.

  7. Which refrigerant is an azeotropic blend made of R-22 and R-115?

    Answer: R-502

    R-502 is a 500-series azeotrope of HCFC-22 and CFC-115.