PA EMISSIONS INSPECTOR CERTIFICATION EXAM QUESTIONS WITH
COMPLETE SOLUTIONS VERIFIED
Station Hotline
(888) 265-5909
Customer Hotline
(800) 265-0921
Sticker Department
(717) 705-2182
An emissions inspector must meet what requirements?
Be at least 18 years of age
Have a valid driver's license
To deliver emissions waivers you must become a(n)...
emissions Certified Repair Technician (CRT)
To become a CRT you must...
Have a valid driver's license
What is the Northern-Emission Inspectors Certification program?
Limited to performing the visual antitampering check and gas-cap test.
Upon successful completion of the N-EIC program you will receive..
An emissions inspection ID card from PennDOT that allows you to perform inspections
on vehicles registered in the Northern Region counties only.
Air pollution
Contamination of the atmosphere by gaseous, liquids or solid wastes or byproducts.
Emitted from natural or human-made sources.
Most of the world's air pollution problems are...
Human-made
Major Pollutants
Hydrocarbons (HCs), carbon monoxide (CO), and nitrogen oxides (NOx). (released
from fossil fuels like gasoline and diesel)
Hydrocarbons
, Unburned fuel of any class of organic compounds composed of carbon and hydrogen
Carbon Monoxide
Colorless, odorless, and poisonous gas. Created when an engine burns HV in the
presence of O2.
Oxygen
Too much or too little can cause improper combustion and result in pollution
Ozone (Smog)
Not emitted directly into the air, it is created at ground level by a chemical reaction
between NOx and HC in the presence of sunlight .
Nitrogen Oxides (NOx)
Excessive amounts can be caused by a lean air-fuel mixture, a defective exhaust gas
recirculation valve, higher than normal engine temperatures, vacuum leaks, and
advanced ignition timing.
Five Gas Theory
The relationship between HC, CO, O2, CO2, and NOx are the same in all gasoline
engines.
Stoichiometric Ratio
For all engines, a mixture of approx. 14.7 parts of air to every one-part of fuel produces
the most efficient use of fuel and the lowest emissions.
Why would hydrocarbon be higher than the stoichiometric ratio?
The mixture is very rich or very lean. Normal combustion is 15:1 air/fuel ratio.
What happens when there is not enough O2 in an engine?
It runs rich, meaning combustion forms more CO and less CO2.
What does it mean if Hc is high and CO is extremely low?
The engine is either very lean or there's a misfire.
What does it mean if CO is very high?
The engine is definitely rich, getting too much fuel or not enough air.
Why is oxygen the best lean indicator?
The levels change during lean mixtures.
Why is oxygen (O2) not a reliable rich indicator?
It is low whenever the mixture is rich. Rich mixtures burn all available O2.
COMPLETE SOLUTIONS VERIFIED
Station Hotline
(888) 265-5909
Customer Hotline
(800) 265-0921
Sticker Department
(717) 705-2182
An emissions inspector must meet what requirements?
Be at least 18 years of age
Have a valid driver's license
To deliver emissions waivers you must become a(n)...
emissions Certified Repair Technician (CRT)
To become a CRT you must...
Have a valid driver's license
What is the Northern-Emission Inspectors Certification program?
Limited to performing the visual antitampering check and gas-cap test.
Upon successful completion of the N-EIC program you will receive..
An emissions inspection ID card from PennDOT that allows you to perform inspections
on vehicles registered in the Northern Region counties only.
Air pollution
Contamination of the atmosphere by gaseous, liquids or solid wastes or byproducts.
Emitted from natural or human-made sources.
Most of the world's air pollution problems are...
Human-made
Major Pollutants
Hydrocarbons (HCs), carbon monoxide (CO), and nitrogen oxides (NOx). (released
from fossil fuels like gasoline and diesel)
Hydrocarbons
, Unburned fuel of any class of organic compounds composed of carbon and hydrogen
Carbon Monoxide
Colorless, odorless, and poisonous gas. Created when an engine burns HV in the
presence of O2.
Oxygen
Too much or too little can cause improper combustion and result in pollution
Ozone (Smog)
Not emitted directly into the air, it is created at ground level by a chemical reaction
between NOx and HC in the presence of sunlight .
Nitrogen Oxides (NOx)
Excessive amounts can be caused by a lean air-fuel mixture, a defective exhaust gas
recirculation valve, higher than normal engine temperatures, vacuum leaks, and
advanced ignition timing.
Five Gas Theory
The relationship between HC, CO, O2, CO2, and NOx are the same in all gasoline
engines.
Stoichiometric Ratio
For all engines, a mixture of approx. 14.7 parts of air to every one-part of fuel produces
the most efficient use of fuel and the lowest emissions.
Why would hydrocarbon be higher than the stoichiometric ratio?
The mixture is very rich or very lean. Normal combustion is 15:1 air/fuel ratio.
What happens when there is not enough O2 in an engine?
It runs rich, meaning combustion forms more CO and less CO2.
What does it mean if Hc is high and CO is extremely low?
The engine is either very lean or there's a misfire.
What does it mean if CO is very high?
The engine is definitely rich, getting too much fuel or not enough air.
Why is oxygen the best lean indicator?
The levels change during lean mixtures.
Why is oxygen (O2) not a reliable rich indicator?
It is low whenever the mixture is rich. Rich mixtures burn all available O2.
