Exhaust Exhaust Emissions & Catalytic Converters 2

Question 1

What does CARB stand for in the context of US vehicle emissions regulations?

Accepted Answer

California Air Resources Board

Answer

CARB is the California Air Resources Board, responsible for setting some of the strictest vehicle emissions standards in the United States.

Question 2

Which of the following is a common symptom of a clogged catalytic converter?

Accepted Answer

Rattling noise from the exhaust

Answer

A clogged catalytic converter restricts exhaust flow, causing back pressure that can result in a rattling noise, especially at startup or low speeds.

Question 3

What is the 'light-off temperature' of a catalytic converter?

Accepted Answer

The minimum temperature for the catalyst to become active

Answer

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.

Question 4

Which fuel additive can permanently damage a catalytic converter?

Accepted Answer

Leaded gasoline

Answer

Lead poisons the precious metal catalysts inside a converter, permanently destroying its ability to oxidize and reduce exhaust pollutants.

Question 5

What type of catalytic converter is commonly used in diesel vehicles to reduce particulate matter?

Accepted Answer

Diesel Particulate Filter (DPF)

Answer

A Diesel Particulate Filter (DPF) physically traps soot particles from diesel exhaust, which are periodically burned off during a regeneration cycle.

Exhaust Practice Test

Exhaust Practice Test

Exhaust Exhaust Emissions & Catalytic Converters 2