Practice Test Geeks(RSES) Refrigeration Service Engineers Society Certification Practice Test
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Refrigerant Management Flashcards

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  1. Under EPA Section 608, what is the maximum allowable annual leak rate for refrigerant in a commercial refrigeration system containing more than 50 lbs of refrigerant?

    Answer: 20%

    EPA Section 608 sets the annual leak rate threshold at 20% for commercial refrigeration systems with more than 50 lbs of refrigerant.

  2. Which refrigerant blend is classified as a zeotropic mixture, meaning its components evaporate and condense at different temperatures?

    Answer: R-404A

    R-404A is a zeotropic blend of R-125, R-143a, and R-134a that exhibits temperature glide during phase change.

  3. When recovering refrigerant from a system with a compressor that is not operational, a technician must use what type of recovery method?

    Answer: System-dependent recovery

    System-dependent (passive) recovery relies on the system's own components and is only viable when the compressor is operable; with a non-operational compressor, a self-contained recovery unit must be used.

  4. What does the term 'temperature glide' refer to in refrigerant blends?

    Answer: The range of temperatures at which a blend changes phase at constant pressure

    Temperature glide is the difference between the bubble point and dew point temperatures of a zeotropic blend during phase change at constant pressure.

  5. A recovery cylinder must not be filled beyond what percentage of its rated capacity by weight?

    Answer: 80%

    DOT regulations require that refrigerant recovery cylinders not be filled beyond 80% of their rated capacity by weight to allow for thermal expansion.

  6. Which organization sets the safety classification system (A1, A2, B1, B2, etc.) for refrigerants used in the HVACR industry?

    Answer: ASHRAE

    ASHRAE Standard 34 establishes the refrigerant safety classification system using letter-number designations for toxicity and flammability.

  7. R-410A operates at significantly higher pressures than R-22. Approximately how much higher are its operating pressures?

    Answer: Twice as high

    R-410A operates at approximately twice the pressure of R-22, requiring system components specifically rated for its higher pressure range.