PA Emissions Inspection Exam Questions With Complete Solution!!

What percent of air pollution is caused by vehicles? - ANSWER -20% How much less air pollution do we have now than in the 1960s? (%) - ANSWER -98% less What is the average thermal efficiency? (%) - ANSWER -20% Where does 80% of the rest of the fuel go to? - ANSWER -Friction, heat, and emissions What are the 5 major pollutants? - ANSWER -Hydrocarbons (HC), Carbon monoxide (CO), Oxides of nitrogen (NOx), Sulfur dioxide (SO2), and particulate matter What are hydrocarbons? - ANSWER -Unburned fuel of carbon and hydrogen What are hydrocarbons emitted through? - ANSWER -Incomplete combustion and fuel evaporation What are hydrocarbons caused by? - ANSWER -Misfire, rich, ignition timing, engine deficiencies, and fuel injectors What has lowered hydrocarbons? - ANSWER -OBD 2, component controls, fuel delivery, ignition, emissions system, and EVAPs Can you see or smell carbon monoxide? - ANSWER -No Is carbon monoxide harmful or nonharmful? - ANSWER -Harmful How is carbon monoxide made? - ANSWER -Incomplete burning of fuel What is carbon monoxide caused by?` - ANSWER -rich, dirty air filter, fuel injectors, high fuel pressure, defective sensors, plugged PCV valve, heat riser valve stuck open, air pump malfunction, oil diluted with gas How is nitrogen oxide made? - ANSWER -Combustion of fuel at high temperatures What is nitrogen oxide the cause of? - ANSWER -Acid rain What type of health issues does nitrogen oxide cause? - ANSWER -Respiratory issues