Practice Test GeeksCFESA - Commercial Food Equipment Service Association Practice Test
← All CFESA Flashcard Decks

Refrigeration Systems Flashcards

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

Read the first 7 Refrigeration Systems flashcards as text

  1. What is the primary purpose of a liquid line filter-drier in a commercial refrigeration system?

    Answer: Remove moisture and contaminants from the refrigerant

    A liquid line filter-drier removes moisture, acid, and solid contaminants from the refrigerant to protect the system components.

  2. A technician finds frost forming uniformly across the entire evaporator coil in a walk-in cooler. What is the most likely cause?

    Answer: Restricted airflow across the coil

    Uniform frost across the entire evaporator typically indicates restricted airflow, while low charge usually causes frost only on part of the coil.

  3. Which refrigerant property is measured by a superheat reading at the evaporator outlet?

    Answer: The vapor temperature above its saturation point at that pressure

    Superheat is the temperature of refrigerant vapor above its saturation (boiling) temperature at a given pressure, confirming all refrigerant has vaporized.

  4. When replacing a hermetic compressor in a commercial reach-in refrigerator, what procedure is MOST critical before brazing the new compressor in place?

    Answer: Recover all refrigerant and pull a deep vacuum

    All refrigerant must be recovered before opening the system, and a deep vacuum must be pulled to remove moisture and non-condensables before recharging.

  5. A commercial ice machine produces small, cloudy ice cubes. What is the MOST likely cause?

    Answer: High mineral content in the water supply

    High mineral content (hard water) causes cloudy, small ice cubes because minerals become trapped in the ice matrix as water freezes.

  6. What does a high discharge pressure combined with a normal or low suction pressure indicate in a commercial refrigeration system?

    Answer: Dirty or blocked condenser coil

    A dirty condenser reduces heat rejection efficiency, causing discharge pressure to rise while suction pressure remains normal or slightly low.

  7. In a commercial refrigeration system using an electronic expansion valve (EEV), which parameter does the controller primarily modulate to maintain proper superheat?

    Answer: Valve opening percentage

    The EEV controller adjusts the valve opening percentage based on superheat sensor feedback to maintain the target superheat setpoint.

How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. cfesa.com — Test delivery, eligibility, registration, renewal, score validity, exam information · verified Oct 2026