Question 1

Which two emissions from engines are required to create smog?

Accepted Answer

HC (hydrocarbons) and NO_X (oxides of nitrogen) are the two emissions from engines that are required to create smog. Smog is a type of air pollution that is caused by the reaction of these two emissions with sunlight.

Question 2

Which of the following refers to all forms of emissions existing as either a solid or liquid but not a gas?

Accepted Answer

Particulate matter (PM) refers to tiny particles or droplets in the air that are solid or liquid, not gaseous.

Question 3

What are the gases produced when nitrogen reacts with oxygen under high-temperature and high-pressure conditions during combustion called?

Accepted Answer

The gases produced when nitrogen reacts with oxygen under high-temperature and high-pressure conditions during combustion are called NOx (oxides of nitrogen), which include nitrogen monoxide (NO) and nitrogen dioxide (NO2).

Question 4

Technician A says that blowby is as noxious from a diesel engine as it is from a spark-ignited gasoline-fueled engine. Technician B says that crankcase controls for diesel engines involve recirculating the crankcase vapors back into the intake air inlet. Who is right?

Accepted Answer

The answer of Technician A says that blowby is as...

Question 5

Blowby is classified as:

Accepted Answer

The answer of Blowby is classified as:
...

Question 6

Which of the following gases is NOT classified as a noxious gaseous emission?

Accepted Answer

Carbon dioxide is not classified as a noxious gaseous emission because it is not harmful to human health.

Question 7

Technician A says that diesel vehicles produced fewer emissions for every ton of weight transported per mile. Technician B says that diesels carry much higher loads and travel much farther using less fuel. Who is right?

Accepted Answer

Diesel engines are generally more efficient than gasoline engines, leading to fewer emissions per ton-mile. They also have better fuel economy, allowing them to carry heavier loads over longer distances with less fuel.

Question 8

Regulating ______ emissions lagged because emissions from this area of the engine are relatively minimal in comparison to gasoline engines.

Accepted Answer

Crankcase emissions are relatively minimal compared to other sources like the exhaust in gasoline engines, hence regulation on these emissions lagged.

Question 9

Beginning in January 2009, which US state was granted a waiver exempting it from US federal emission legislation causing it to enact its own mandatory limits?

Accepted Answer

California was granted a waiver to set its own stricter vehicle emissions standards, separate from federal regulations.

Question 10

What is the fuel economy mpg for combined cars and light trucks in 2024 as established by the Environmental Protection Agency (EPA)?

Accepted Answer

The answer of What is the fuel economy mpg for...

Question 11

The use of which fuel can reduce CO₂ emissions by more than 70%?

Accepted Answer

Biodiesel can reduce CO2 emissions by more than 70% compared to traditional fossil fuels because it is made from renewable resources and has a lower carbon footprint.

Question 12

Which of the following is NOT a common cause of HC emissions?

Accepted Answer

Fine spray droplets are not a common cause of hydrocarbon (HC) emissions. HC emissions typically result from incomplete combustion due to factors like inadequate combustion time, improperly mixed air and fuel, or insufficient combustion heat and pressure.

Question 13

________ is the area where fuel can hide and lead to improper burning.

Accepted Answer

Crevice volume is the area where fuel can hide, leading to incomplete combustion and improper burning.

Question 14

Research has discovered that close to 50% of HC emissions from diesels can originate from the fuel trapped in the __________ area.

Accepted Answer

Crevice volume is the space between the piston and the cylinder wall where unburned fuel can get trapped, leading to hydrocarbon emissions.

Question 15

Which of the following is a hydrocarbon counted in the measurement of an engine's total hydrocarbon emissions?

Accepted Answer

The answer of Which of the following is a hydrocarbon...

Question 16

Diesel's high compression pressure and excess combustion air increases which of the following exhaust emissions?

Accepted Answer

Diesel engines operate at high compression ratios and temperatures, which promote the formation of oxides of nitrogen (NOx) due to the reaction between nitrogen and oxygen in the air.

Question 17

Black sooty exhaust smoke is evidence of:

Accepted Answer

Black sooty exhaust smoke is typically a sign of particulate emissions, which are tiny particles of soot and other substances released from incomplete combustion in engines.

Question 18

PM-10 is particulate matter that is:

Accepted Answer

PM-10 refers to particulate matter with a diameter of 10 microns or less, which can be inhaled and cause health issues.

Question 19

What type of particulate is formed primarily because diesel fuel burns from the outside inward?

Accepted Answer

Black carbon is formed from incomplete combustion of fossil fuels, including diesel, where the fuel burns from the outside inward, leaving carbon-rich particles.

Question 20

Which of the following will MOST LIKELY allow soot to leak past the catalyst and into the exhaust?

Accepted Answer

The answer of Which of the following will MOST LIKELY...

Quiz 3: Diesel Engine Emissions

Which two emissions from engines are required to create smog?

Which of the following refers to all forms of emissions existing as either a solid or liquid but not a gas?

What are the gases produced when nitrogen reacts with oxygen under high-temperature and high-pressure conditions during combustion called?

Technician A says that blowby is as noxious from a diesel engine as it is from a spark-ignited gasoline-fueled engine. Technician B says that crankcase controls for diesel engines involve recirculating the crankcase vapors back into the intake air inlet. Who is right?

Blowby is classified as:

Which of the following gases is NOT classified as a noxious gaseous emission?

Technician A says that diesel vehicles produced fewer emissions for every ton of weight transported per mile. Technician B says that diesels carry much higher loads and travel much farther using less fuel. Who is right?

Regulating ______ emissions lagged because emissions from this area of the engine are relatively minimal in comparison to gasoline engines.

Beginning in January 2009, which US state was granted a waiver exempting it from US federal emission legislation causing it to enact its own mandatory limits?

What is the fuel economy mpg for combined cars and light trucks in 2024 as established by the Environmental Protection Agency (EPA) ?

The use of which fuel can reduce CO₂ emissions by more than 70%?

Which of the following is NOT a common cause of HC emissions?

________ is the area where fuel can hide and lead to improper burning.

Research has discovered that close to 50% of HC emissions from diesels can originate from the fuel trapped in the __________ area.

Which of the following is a hydrocarbon counted in the measurement of an engine's total hydrocarbon emissions?

Diesel's high compression pressure and excess combustion air increases which of the following exhaust emissions?

Black sooty exhaust smoke is evidence of:

PM-10 is particulate matter that is:

What type of particulate is formed primarily because diesel fuel burns from the outside inward?

Which of the following will MOST LIKELY allow soot to leak past the catalyst and into the exhaust?

Quiz 3: Diesel Engine Emissions

Which two emissions from engines are required to create smog?

Which of the following refers to all forms of emissions existing as either a solid or liquid but not a gas?

What are the gases produced when nitrogen reacts with oxygen under high-temperature and high-pressure conditions during combustion called?

Technician A says that blowby is as noxious from a diesel engine as it is from a spark-ignited gasoline-fueled engine. Technician B says that crankcase controls for diesel engines involve recirculating the crankcase vapors back into the intake air inlet. Who is right?

Blowby is classified as:

Which of the following gases is NOT classified as a noxious gaseous emission?

Technician A says that diesel vehicles produced fewer emissions for every ton of weight transported per mile. Technician B says that diesels carry much higher loads and travel much farther using less fuel. Who is right?

Regulating ______ emissions lagged because emissions from this area of the engine are relatively minimal in comparison to gasoline engines.

Beginning in January 2009, which US state was granted a waiver exempting it from US federal emission legislation causing it to enact its own mandatory limits?

What is the fuel economy mpg for combined cars and light trucks in 2024 as established by the Environmental Protection Agency (EPA) ?

The use of which fuel can reduce CO2 emissions by more than 70%?

Which of the following is NOT a common cause of HC emissions?

________ is the area where fuel can hide and lead to improper burning.

Research has discovered that close to 50% of HC emissions from diesels can originate from the fuel trapped in the __________ area.

Which of the following is a hydrocarbon counted in the measurement of an engine's total hydrocarbon emissions?

Diesel's high compression pressure and excess combustion air increases which of the following exhaust emissions?

Black sooty exhaust smoke is evidence of:

PM-10 is particulate matter that is:

What type of particulate is formed primarily because diesel fuel burns from the outside inward?

Which of the following will MOST LIKELY allow soot to leak past the catalyst and into the exhaust?

The use of which fuel can reduce CO₂ emissions by more than 70%?