Exhaust Emissions & Catalytic Converters Flashcards
6 cards from real Exhaust practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
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What does CARB stand for in the context of US vehicle emissions regulations?
Answer: California Air Resources Board
CARB is the California Air Resources Board, responsible for setting some of the strictest vehicle emissions standards in the United States.
Which of the following is a common symptom of a clogged catalytic converter?
Answer: Rattling noise from the exhaust
A clogged catalytic converter restricts exhaust flow, causing back pressure that can result in a rattling noise, especially at startup or low speeds.
What is the 'light-off temperature' of a catalytic converter?
Answer: The minimum temperature for the catalyst to become active
The light-off temperature is the minimum temperature (typically around 400–600°F / 200–315°C) at which the catalytic converter begins to effectively reduce emissions.
Which fuel additive can permanently damage a catalytic converter?
Answer: Leaded gasoline
Lead poisons the precious metal catalysts inside a converter, permanently destroying its ability to oxidize and reduce exhaust pollutants.
What type of catalytic converter is commonly used in diesel vehicles to reduce particulate matter?
Answer: Diesel Particulate Filter (DPF)
A Diesel Particulate Filter (DPF) physically traps soot particles from diesel exhaust, which are periodically burned off during a regeneration cycle.
Which state in the US was the first to establish its own vehicle emissions testing standards stricter than the federal baseline?
Answer: California
California has been granted a federal waiver allowing it to set stricter emissions standards than the EPA baseline, which other states can choose to adopt.