Question 1

What state is fuel-sourced particulate matter (PM) in as it exits the tailpipe?

Accepted Answer

A)  solid 
B)  liquid 
C)  gaseous 
D)  plasma 
A)  solid 
B)  liquid 
C)  gaseous 
D)  plasma A

Question 2

How many electrons does a hydrogen atom have?

Accepted Answer

A)  one 
B)  two 
C)  eight 
D)  one hundred and two 
A)  one 
B)  two 
C)  eight 
D)  one hundred and two A

Question 3

What is the smallest particle of a compound that can exist in a free state and take part in a chemical reaction known as?

Accepted Answer

A)  element 
B)  atom 
C)  proton 
D)  molecule 
A)  element 
B)  atom 
C)  proton 
D)  molecule D

Question 4

Which of the following would be closest to the stoichiometric ratio of a diesel fuel by volume when combusted using ambient air?

Accepted Answer

A)  1:1 
B)  8:1 
C)  15:1 
D)  12,000:1 
A)  1:1 
B)  8:1 
C)  15:1 
D)  12,000:1

Question 5

Technician A says that sulfur dioxide emissions from diesel engines are much less of a problem today than they were back in 2006. Technician B says that diesel-sourced particulate matter (PM) smaller than the eye can see is capable of causing respiratory problems in humans. Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 6

How many hydrogen atoms are there in a single molecule of water?

Accepted Answer

A)  one 
B)  two 
C)  four 
D)  eight 
A)  one 
B)  two 
C)  four 
D)  eight

Question 7

When diesel fuel is combusted in an engine cylinder, which of the following is produced in the greatest quantity by mass (weight)?

Accepted Answer

A)  carbon dioxide 
B)  water vapor 
C)  hydrocarbons 
D)  particulate matter 
A)  carbon dioxide 
B)  water vapor 
C)  hydrocarbons 
D)  particulate matter

Question 8

What is present in the greatest quantity (by mass) in a diesel engine cylinder at the moment of ignition?

Accepted Answer

A)  fuel 
B)  hydrogen 
C)  nitrogen 
D)  oxygen 
A)  fuel 
B)  hydrogen 
C)  nitrogen 
D)  oxygen

Question 9

What should you know about carbon monoxide that could adversely affect your health?

Accepted Answer

A)  it is explosive 
B)  breathing it can be lethal 
C)  it has a low boiling point 
D)  contact with exposed skin can be harmful 
A)  it is explosive 
B)  breathing it can be lethal 
C)  it has a low boiling point 
D)  contact with exposed skin can be harmful

Question 10

Which of the following is not a fluid?

Accepted Answer

A)  steam 
B)  water 
C)  gaseous propane 
D)  ice 
A)  steam 
B)  water 
C)  gaseous propane 
D)  ice

Question 11

Where is the positive charge located in an atom?

Accepted Answer

A)  in the valence 
B)  entirely in the nucleus 
C)  distributed evenly in the shells 
D)  distributed evenly between the nucleus and the shells 
A)  in the valence 
B)  entirely in the nucleus 
C)  distributed evenly in the shells 
D)  distributed evenly between the nucleus and the shells

Question 12

For what reason is carbon monoxide (CO) much less of an emissions problem in diesel engines than in gasoline-fueled engines?

Accepted Answer

A)  gasoline contains much more carbon 
B)  diesel fuel contains much more hydrogen 
C)  diesels run twice as hot as gasoline engines 
D)  CO results when fuel/air mixtures are close to, or richer than stoichiometric 
A)  gasoline contains much more carbon 
B)  diesel fuel contains much more hydrogen 
C)  diesels run twice as hot as gasoline engines 
D)  CO results when fuel/air mixtures are close to, or richer than stoichiometric

Question 13

Which of the following is an example of diatomic oxygen?

Accepted Answer

A)  ozone 
B)  a single atom of oxygen 
C)  ambient oxygen at ground level 
D)  oxygen combined with 2 atoms of hydrogen 
A)  ozone 
B)  a single atom of oxygen 
C)  ambient oxygen at ground level 
D)  oxygen combined with 2 atoms of hydrogen

Question 14

At what zone location within the cylinder will (initial) ignition take place in properly functioning diesel engine?

Accepted Answer

A)  at the tip of the injector 
B)  in the piston headland 
C)  where the fuel/air mixture is at its most lean 
D)  where the fuel/air mixture is close to stoichiometric 
A)  at the tip of the injector 
B)  in the piston headland 
C)  where the fuel/air mixture is at its most lean 
D)  where the fuel/air mixture is close to stoichiometric

Question 15

What type of condition is diesel knock caused by?

Accepted Answer

A)  bottom end bearing failure 
B)  afterburn 
C)  detonation 
D)  backfire 
A)  bottom end bearing failure 
B)  afterburn 
C)  detonation 
D)  backfire

Question 16

Ideally, when should the highest cylinder pressure occur during combustion in a diesel engine?

Accepted Answer

A)  ignition 
B)  injection 
C)  beginning the third phase of combustion 
D)  afterburn 
A)  ignition 
B)  injection 
C)  beginning the third phase of combustion 
D)  afterburn

Question 17

In a diesel engine, the time period between the start of injection and the beginning of combustion is known as:

Accepted Answer

A)  injection lag 
B)  ignition delay 
C)  pre-combustion 
D)  afterburn 
A)  injection lag 
B)  ignition delay 
C)  pre-combustion 
D)  afterburn

Question 18

Which of the following would be a typical stoichiometric ratio of a diesel fuel by mass when combusted using ambient air?

Accepted Answer

A)  1:1 
B)  8:1 
C)  15:1 
D)  12,000:1 
A)  1:1 
B)  8:1 
C)  15:1 
D)  12,000:1

Exam 17: Chemistry and Combustion

What state is fuel-sourced particulate matter (PM) in as it exits the tailpipe?

How many electrons does a hydrogen atom have?

What is the smallest particle of a compound that can exist in a free state and take part in a chemical reaction known as?

Which of the following would be closest to the stoichiometric ratio of a diesel fuel by volume when combusted using ambient air?

Technician A says that sulfur dioxide emissions from diesel engines are much less of a problem today than they were back in 2006. Technician B says that diesel-sourced particulate matter (PM) smaller than the eye can see is capable of causing respiratory problems in humans. Who is correct?

How many hydrogen atoms are there in a single molecule of water?

When diesel fuel is combusted in an engine cylinder, which of the following is produced in the greatest quantity by mass (weight)?

What is present in the greatest quantity (by mass) in a diesel engine cylinder at the moment of ignition?

What should you know about carbon monoxide that could adversely affect your health?

Which of the following is not a fluid?

Where is the positive charge located in an atom?

For what reason is carbon monoxide (CO) much less of an emissions problem in diesel engines than in gasoline-fueled engines?

Which of the following is an example of diatomic oxygen?

At what zone location within the cylinder will (initial) ignition take place in properly functioning diesel engine?

What type of condition is diesel knock caused by?

Ideally, when should the highest cylinder pressure occur during combustion in a diesel engine?

In a diesel engine, the time period between the start of injection and the beginning of combustion is known as:

Which of the following would be a typical stoichiometric ratio of a diesel fuel by mass when combusted using ambient air?

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