Question 1

After the following exhaust emissions were measured, how was the engine operating?
HC = 766 PPM CO₂= 8.2% CO = 4.6% O₂= 0.1%

A) Engine operating (coolant) temperature too high
B) Too lean
C) Operating at stoichiometric ratio
D) Too rich

Accepted Answer

The high HC and CO readings indicate that the engine is running too rich, meaning that there is too much fuel in the air-fuel mixture.

Question 2

Which of the following is a measure of combustion efficiency? A) O₂ B) CO C) HC D) CO₂

Accepted Answer

CO₂ is a measure of combustion efficiency because complete combustion of hydrocarbons results in the production of carbon dioxide.

Question 3

Which EPA bin number indicates a cleaner vehicle?&#10;A) 10&#10;B) 3&#10;C) 8&#10;D) 11

Accepted Answer

EPA bin 3 indicates a cleaner vehicle, as it represents vehicles that have lower emissions and better fuel efficiency.

Question 4

OBD-II equipped vehicles are required to turn on the malfunction indicator lamp if the system has detected an exhaust emission level that is ________ the FTP limit.&#10;A) the same as&#10;B) 1.5 times or higher than&#10;C) 1.5 times less than&#10;D) None of these

Accepted Answer

OBD-II equipped vehicles are required to turn on the malfunction indicator lamp if the system has detected an exhaust emission level that is 1.5 times or higher than the FTP (Federal Test Procedure) limit. This is to alert the driver that there is an issue with the vehicle's emissions system that needs to be addressed.

Question 5

Oxides of nitrogen results from a combination of nitrogen and ________.&#10;A) nitrogen&#10;B) oxygen&#10;C) carbon&#10;D) hydrogen

Accepted Answer

Oxides of nitrogen are formed when nitrogen reacts with oxygen.

Question 6

A vehicle is being inspected under an OBD-II testing program and the MIL is ON. What will be the results of the inspection?&#10;A) The vehicle will receive an 80% pass rate&#10;B) The vehicle will fail the test&#10;C) The vehicle will pass the test&#10;D) None of these

Accepted Answer

If the MIL (Malfunction Indicator Lamp) is ON during an OBD-II (On-Board Diagnostics II) testing program, it indicates that there is a problem with the vehicle's emissions control system. As a result, the vehicle will fail the test.

Question 7

NO_xreadings at idle should be less than ________. A) 10 ppm B) 1 ppm C) 100 ppm D) None of these is correct

Accepted Answer

The answer of NO_xreadings at idle should be less...

Question 8

Burning or watering eyes indicates excessive ________ in the vehicle exhaust.&#10;A) hydrocarbons&#10;B) oxides of nitrogen&#10;C) vacuum&#10;D) air

Accepted Answer

Oxides of nitrogen are a common cause of eye irritation, especially in high concentrations.

Question 9

Which of these vehicle types would be classified as a ZEV vehicle?&#10;A) A hybrid vehicle&#10;B) A fuel cell powered vehicle&#10;C) An electric vehicle&#10;D) Either B or C

Accepted Answer

A ZEV vehicle is a zero-emission vehicle that emits no harmful pollutants from its exhaust system. Hybrid vehicles use both an electric motor and a gasoline-powered engine, which means they still emit some pollutants. Therefore, A is not the correct choice. On the other hand, fuel cell powered vehicles and electric vehicles do not emit any harmful pollutants, which makes them ZEVs. Hence, B and C both can be classified as ZEVs, and the correct choice is D.

Question 10

LEV III emission standards started with what year vehicles?&#10;A) 2025&#10;B) 1990&#10;C) 2015&#10;D) 2009

Accepted Answer

LEV III emission standards started with 2015 model year vehicles.

Question 11

Adding alcohol to the gasoline helps to reduce which of these emissions?&#10;A) O2&#10;B) H2O&#10;C) NOx&#10;D) CO

Accepted Answer

The answer of Adding alcohol to the gasoline helps to...

Question 12

A defective or worn spark plug can cause which exhaust emission to increase?&#10;A) NOx&#10;B) CO2&#10;C) H2O&#10;D) HC

Accepted Answer

The answer of A defective or worn spark plug can...

Question 13

An exhaust emission test shows high CO readings. Which of these could be the cause?&#10;A) Non-functioning catalytic converter&#10;B) Fuel pressure too high&#10;C) Clogged air filter&#10;D) Any of these could cause high CO readings

Accepted Answer

The answer of An exhaust emission test shows high CO...

Deck 26: Vehicle Emissions Standards and Testing