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Emissions Control & Environmental Compliance Flashcards

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

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  1. What does 'ULSD' stand for, and why is it required for modern diesel emissions systems?

    Answer: Ultra-Low Sulfur Diesel; high sulfur poisons DPF and SCR catalysts

    ULSD (Ultra-Low Sulfur Diesel) contains 15 ppm sulfur or less, which is essential because sulfur poisons the precious metal catalysts in DPF and SCR aftertreatment systems.

  2. In a CTE classroom context, which workplace safety regulation requires a Safety Data Sheet (SDS) to be available for hazardous chemicals like carburetor cleaner or brake cleaner?

    Answer: OSHA Hazard Communication Standard (HazCom / 29 CFR 1910.1200)

    OSHA's Hazard Communication Standard (HazCom) requires employers to maintain SDS for all hazardous chemicals and ensure workers are trained on their use.

  3. Which OBD-II monitor must complete its self-test before a vehicle can pass an emissions inspection after a battery disconnect?

    Answer: All required readiness monitors, including catalyst, EVAP, and oxygen sensor monitors

    After a battery disconnect, all required OBD-II readiness monitors must run their self-tests and show 'Ready' status; otherwise, the vehicle will fail or be rejected at an I/M station.

  4. California's Low Emission Vehicle (LEV) program introduced a category called SULEV. What does SULEV stand for?

    Answer: Super Ultra-Low Emission Vehicle

    SULEV (Super Ultra-Low Emission Vehicle) is a California ARB classification for vehicles that produce extremely low tailpipe emissions, roughly 90% cleaner than average new cars at the time.

  5. A shop generates used antifreeze containing heavy metals. Under EPA regulations, this waste is classified as which type?

    Answer: Potentially hazardous waste requiring proper collection and disposal

    Used antifreeze can contain lead and other heavy metals, classifying it as potentially hazardous waste requiring collection by a licensed recycler or disposal per state regulations.

  6. Which emission is most directly responsible for the formation of ground-level ozone (smog)?

    Answer: NOx and volatile organic compounds (VOCs) reacting with sunlight

    Ground-level ozone forms through photochemical reactions between NOx and VOCs in the presence of sunlight, making these two pollutants primary smog precursors.

  7. What is 'diesel exhaust fluid' (DEF) chemically composed of, and what does it do in an SCR system?

    Answer: A 32.5% urea-water solution that reduces NOx into harmless nitrogen and water

    DEF is a 32.5% aqueous urea solution; when injected into hot exhaust upstream of the SCR catalyst, it converts to ammonia, which reacts with NOx to produce harmless N2 and H2O.