Emission Control MCQ Test
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The illuminated malfunction indicator lamp (MIL) lets the tech know that there is an emission problem that needs to be diagnosed.
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True
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False
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Get ready to test your brain skills cause we present you here with an amazing 'Emission Control MCQ Test'. This quiz consists of questions that are based on emission control and its related concepts. Do you think you'll be able to pass this quiz? Let's start the quiz and see how well you can score. Ready? Let's start the quiz then!
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- 2.
Emissions can be caused naturally by:
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Forest fires.
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Volcanoes.
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Decomposition of materials.
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All of the above
Correct Answer
A. All of the aboveExplanation
Emissions are a product of combustion. Combustion is naturally occurring and so are instances that aren't man-made.Rate this question:
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- 3.
A limit value is the maximum amount of _____________ that a vehicle is permitted to emit.
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Speed
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Emissions
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Air
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Water
Correct Answer
A. EmissionsExplanation
There is a limit on how much of each harmful gas a vehicle can emit.Rate this question:
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- 4.
What does the Environmental Protection Agency (EPA) require all vehicles to have to warn the driver of an emission fault?
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A beeping horn
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An illuminated light
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A buzzing buzzer
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A ringing bell
Correct Answer
A. An illuminated lightExplanation
A light MUST BE in every vehicle that has OBD II.Rate this question:
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- 5.
Today's emissions come from the vehicle's:
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Fuel system.
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Crankcase.
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Tailpipe.
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All of the above
Correct Answer
A. All of the aboveExplanation
Unwanted vehicle emissions are created from all of the above.Rate this question:
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- 6.
In automotive applications, most_______________ is/are a by-product of combustion and is/are emitted from the exhaust system.
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Fuel
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Air
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Emissions
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Catalysts
Correct Answer
A. EmissionsExplanation
Most emissions created from cars is from the tailpipe.Rate this question:
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- 7.
The main concern of the evaporative emission (EVAP) system is the gas cap.
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True
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False
Correct Answer
A. TrueExplanation
Yes, the fuel filler cap is by far the most overlooked component of the EVAP emissions system, by both customers and technicians.Rate this question:
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- 8.
Tech A says that carbon monoxide is lethal. Tech B says never to run an engine inside a closed shop without proper exhaust ventilation. Who is correct?
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Tech A
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Tech B
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Both Techs A and B
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Neither Tech A nor B
Correct Answer
A. Both Techs A and BExplanation
CO will kill you. An engine running in an unventelated shop will harbor this deadly gas.Rate this question:
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- 9.
The stoichiometric ratio also referred to as lambda, is the ratio of air to fuel at which all of the oxygen in the air and all the fuel are completely burned. The stoichiometric ratio for gasoline is:
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34.3:1.
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17.2:1.
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15.7:1.
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14.7:1.
Correct Answer
A. 14.7:1.Explanation
14.7:1 is the sweet spot for engine performance and emissions.Rate this question:
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- 10.
______________ is a colorless, odorless, tasteless, flammable, and highly toxic gas.
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Carbon dioxide
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Hydrocarbons
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Carbon monoxide
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Sulfur
Correct Answer
A. Carbon monoxideExplanation
CO is a harmful gas to humans. It will suffocate you.Rate this question:
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- 11.
The term _________________, when used in automotive circles, normally refers to the pollution produced by a light vehicle during operation of the vehicle or while sitting stationary.
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Catalyst
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Compression
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Combustion
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Emission
Correct Answer
A. EmissionExplanation
Emissions are the polluting discharge of a running vehicle.Rate this question:
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- 12.
The evaporative emission (EVAP) system is designed to ensure that hydrocarbons are released into the atmosphere.
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True
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False
Correct Answer
A. FalseExplanation
The EVAP emissions system's sole purpose is to harness evaporated HC and to direct it into the engine intake to be burned.Rate this question:
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- 13.
____________ is created when raw fuel evaporates into the atmosphere or when it does not burn at all in the combustion chamber and is exhausted out the tailpipe.
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Carbon dioxide
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Hydrocarbons
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Carbon monoxide
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Sulfur
Correct Answer
A. HydrocarbonsExplanation
Raw fuel is primary comprised of hydrogen and carbon.Rate this question:
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- 14.
In what year did it become mandatory for all vehicles to be on-board diagnostic II (OBDII) compliant?
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1994
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1995
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1996
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1997
Correct Answer
A. 1996Explanation
Federally mandated OBD II was put into effect in 1996. It was a landmark year for the automotive industry.Rate this question:
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- 15.
Tech A says that a closed-loop is when the feedback system is ignoring the sensors. Tech B says that a closed-loop is when the feedback system uses all the sensors to control the PCM. Who is correct?
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Tech A
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Tech B
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Both Techs A and B
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Neither Tech A nor B
Correct Answer
A. Tech BExplanation
Closed loop is when there is an intact feedback system and the PCM uses its inputs to make engine running adjustments.Rate this question:
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- 16.
Tech A says that hydrocarbons are created when raw fuel does not burn completely in the combustion chamber and is exhausted out of the tailpipe. Tech B says that hydrocarbons are created when raw fuel evaporates into the atmosphere. Who is correct?
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Tech A
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Tech B
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Both Techs A and B
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Neither Tech A nor B
Correct Answer
A. Both Techs A and BExplanation
Raw fuel is primarily comprised of hydrogen and carbon, whether liquid or vapor.Rate this question:
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- 17.
____________ is a by-product of complete combustion, along with water.
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Carbon monoxide
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Hydrocarbons
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Carbon dioxide
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Sulfur
Correct Answer
A. Carbon dioxideExplanation
CO2 is a by-product of complete combustion.Rate this question:
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- 18.
Tech A says that under high temperature and pressure of combustion, oxides of nitrogen are produced. Tech B says that oxides of nitrogen are only produced at temperatures less than 500°F. Who is correct?
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Tech A
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Tech B
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Both Techs A and B
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Neither Tech A nor B
Correct Answer
A. Tech AExplanation
NOx is a by-product of incomplete combustion and will result in higher exhaust temperatures. NOx are created at all temperatures, but lots of them are created when there is extreme heat.Rate this question:
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- 19.
Tech A says that the positive crankcase ventilation (PCV) system removes blow-by gases from the crankcase in a manner that is not harmful to the environment. Tech B says that the PCV system prevents the build-up of crankcase pressure. Who is correct?
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Tech A
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Tech B
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Both Techs A and B
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Neither Tech A nor B
Correct Answer
A. Both Techs A and BExplanation
The PCV system's responsibility is to recycle blow by gasses back into the engine to be burned. It also relives the build up of pressure created by these blow by gasses.Rate this question:
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- 20.
Today's vehicle technology has reduced the harmful emissions on new vehicles to almost:
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0%.
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5%.
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10%.
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15%.
Correct Answer
A. 0%.Explanation
With all of the progressive technology available today, emissions of vehicles is approaching zero.Rate this question:
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- 21.
In what year did the catalytic convertor first make its appearance on automobiles' emission control systems?
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1970
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1971
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1972
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1973
Correct Answer
A. 1973Explanation
1973 is the year when the catalytic converter premiered.Rate this question:
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- 22.
Tech A says that the more oxygen the engine uses means the engine is running a rich mixture. Tech B says that the less oxygen the engine uses means the engine is running a lean mixture. Who is correct?
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Tech A
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Tech B
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Both Techs A and B
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Neither Tech A nor B
Correct Answer
A. Neither Tech A nor BExplanation
More oxygen means an engine is running lean.Rate this question:
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- 23.
In what year was the positive crankcase ventilation (PCV) first used on vehicles' emission systems?
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1959
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1960
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1961
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1962
Correct Answer
A. 1961Explanation
Another landmark year in automotive mechanics. 1961 is the year for the introduction of the PCV system.Rate this question:
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- 24.
Tech A says that the exhaust gas recirculation (EGR) valve does not function at idle. Tech B says that the EGR valve will not function during wide-open throttle (WOT). Who is correct?
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Tech A
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Tech B
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Both Techs A and B
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Neither Tech A nor B
Correct Answer
A. Tech BExplanation
The EGR valve mostly operates during cruising speeds. At idle, the engine will run very poorly. The need for performance supersedes the need for EGR system operation.Rate this question:
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- 25.
Tech A says that during open-loop operation, the engine control module (ECM) ignores the oxygen sensor signal and operates based on the last known ECM values. Tech B says that during ECM's last known values, the following sensors run: manifold absolute pressure (MAP) sensor, mass airflow (MAF) sensor, throttle position sensor (TPS), and intake air temperature (IAT) sensor. Who is correct?
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Tech A
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Tech B
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Both Techs A and B
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Neither Tech A nor B
Correct Answer
A. Neither Tech A nor BExplanation
During the open loop, the ECM / PCM does ignore the O2 sensors, but it uses preprogrammed values to run the engine. The MAP is an active value. To run well, it needs current readings.Rate this question:
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Mar 21, 2023Quiz Edited by
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Nov 14, 2014Quiz Created by
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