Practice Test Geeks(RSES) Refrigeration Service Engineers Society Certification Practice Test
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Safety Procedures Flashcards

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

Read the first 7 Safety Procedures flashcards as text

  1. An ammonia (R-717) refrigeration system develops a large leak in a machinery room. What is the FIRST action the technician on site should take?

    Answer: Activate the emergency shutdown, evacuate personnel, and alert emergency services

    Ammonia is toxic and immediately dangerous to life at 300 ppm; emergency shutdown, evacuation, and contacting emergency services are the immediate priorities.

  2. What is the significance of the ASHRAE 15 standard for refrigeration safety?

    Answer: It establishes safety requirements for refrigerating systems including machinery room design and refrigerant limits

    ASHRAE Standard 15 covers safety requirements for refrigerating systems including machinery room ventilation, occupancy classification, refrigerant quantity limits, and equipment requirements.

  3. Why should a technician NEVER use oxygen or compressed air to pressure test a refrigeration system?

    Answer: Oxygen mixed with refrigerant oil can create a flammable or explosive mixture

    Oxygen mixed with compressor oil creates a potentially explosive combination, and compressed air introduces moisture; only dry nitrogen is safe for pressure testing refrigerant systems.

  4. According to EPA Section 608 regulations, which refrigerants are subject to mandatory recovery requirements before servicing equipment?

    Answer: All refrigerants regulated under Clean Air Act Section 608, including CFCs, HCFCs, and HFCs

    EPA Section 608 regulations require recovery of all regulated refrigerants—CFCs, HCFCs, and HFCs—from appliances before service, maintenance, or disposal.

  5. A refrigeration system shows extremely high discharge pressure but normal suction pressure. What safety risk does this present to the technician?

    Answer: Risk of high-side component rupture from overpressure, potentially causing projectile hazards

    Abnormally high discharge pressure can exceed the design limits of high-side components, risking rupture of fittings, hoses, or vessels and creating dangerous projectile or spray hazards.

  6. What is the purpose of an oxygen-depletion sensor in a refrigerant machinery room?

    Answer: To detect when oxygen levels drop below safe limits due to refrigerant displacement, triggering alarms

    Oxygen-depletion sensors alarm when O2 drops below approximately 19.5%, indicating that refrigerant or other gases have displaced enough oxygen to create an immediately dangerous atmosphere.

  7. A technician needs to transport refrigerant cylinders in a service vehicle. Which practice is a safety violation?

    Answer: Transporting cylinders in a fully enclosed trunk or passenger compartment without ventilation

    Transporting pressurized refrigerant cylinders in an enclosed, unventilated passenger compartment is dangerous because leaks can displace oxygen or accumulate flammable concentrations.