Automotive Fuel & Emission Control Questions and Answers 2023/2024

Smog - ANSWER-is created by a photochemical reaction The three major pollutants in automobile exhaust are - ANSWER-Carbon monoxide, oxides of nitrogen, hydrocarbons Fuel evaporation accounts for what percentage of total HC emissions? - ANSWER-20 percent Particulate matter is - ANSWER-Microscopic particles suspended in the atmosphere. Carbon monoxide is a result of - ANSWER-Incomplete combustion. Sulfur oxides are harmful because they - ANSWER-Combine with water to form sulfuric acid. Ozone is created by a combination of sunlight, still air, and - ANSWER-High levels of CO and NOx A temperature inversion increases air pollution by - ANSWER-Forming a " lid " over stagnant air U.S federal emission limits are established by the - ANSWER-Enviromental Protection Agency Corporate Average Fuel Economy (CAFE) standards were rolled back in the - ANSWER-1990s Sulfur by-products of combustion can combine with water to form - ANSWER-Sulfuric acid The only major type of pollutant that comes from a vehicle source other than the exhaust is - ANSWER-CO OBD-1 seeks to decrease levels of automobile emission by - ANSWER-Alerting the driver to a potential problem and monitoring the efficiency with which certain systems are operating. An automotive internal combustion engine - ANSWER-has pistons that are driven downward by explosions in the combustion chamber A spark plug fires near the end of the - ANSWER-Power stroke