PA Emissions Inspection EXAM LATEST 2024
/2O25 ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
What health problems can pollution cause? - ANSWER>>Respiratory issues
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
What is nitrogen oxide caused by? - ANSWER>>lean, defective EGR, high temperature, vacuum
leaks, advance ignition timing
What can too little or too much oxygen cause? - ANSWER>>Improper combustion
What is too little oxygen caused by? - ANSWER>>rich, dirty air filter, fuel injectors, high fuel
pressure, defective sensors, restricted PCV valve, EVAP purges at idle
What is too much oxygen caused by? - ANSWER>>lean, misfire, vacuum leak, exhaust leak
Where is ozone/smog made at? - ANSWER>>Ground level
What creates smog? - ANSWER>>Oxides of nitrogen and hydrocarbons mixed together in the
sunlight
What health issue can smog cause? - ANSWER>>Damaged lungs
What is particulates? - ANSWER>>Dirt, dust, etc.
How are particulates made? - ANSWER>>Combustion
What is the stoichiometric level? - ANSWER>>14.7 parts air to 1 part fuel
Is the mixture lean or rich during a cold start or acceleration? - ANSWER>>Rich
When are hydrocarbons consistent? - ANSWER>>14.7:1
When are hydrocarbons high? - ANSWER>>When rich or lean
/2O25 ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
What health problems can pollution cause? - ANSWER>>Respiratory issues
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
What is nitrogen oxide caused by? - ANSWER>>lean, defective EGR, high temperature, vacuum
leaks, advance ignition timing
What can too little or too much oxygen cause? - ANSWER>>Improper combustion
What is too little oxygen caused by? - ANSWER>>rich, dirty air filter, fuel injectors, high fuel
pressure, defective sensors, restricted PCV valve, EVAP purges at idle
What is too much oxygen caused by? - ANSWER>>lean, misfire, vacuum leak, exhaust leak
Where is ozone/smog made at? - ANSWER>>Ground level
What creates smog? - ANSWER>>Oxides of nitrogen and hydrocarbons mixed together in the
sunlight
What health issue can smog cause? - ANSWER>>Damaged lungs
What is particulates? - ANSWER>>Dirt, dust, etc.
How are particulates made? - ANSWER>>Combustion
What is the stoichiometric level? - ANSWER>>14.7 parts air to 1 part fuel
Is the mixture lean or rich during a cold start or acceleration? - ANSWER>>Rich
When are hydrocarbons consistent? - ANSWER>>14.7:1
When are hydrocarbons high? - ANSWER>>When rich or lean
