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Grade 10 Chapter 20

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Technician A says that the ideal, chemically correct fuel mixture is 14 parts air to 1 part fuel. Technician B says that 15 parts air to 1 part fuel is the right ratio. Who is correct?
a.
A only.
c.
Both A and B.
b.
B only.
d.
Neither A nor B.
 

 2. 

Preignition will cause ____ in the engine.
a.
ping
c.
detonation knock
b.
dieseling
d.
spark knock
 

True/False
Indicate whether the statement is true or false.
 

 3. 

A lean air-fuel mixture results in poor gas mileage.
 

 4. 

Diesel fuel does not vaporize as easily as gasoline.
 

 5. 

In a diesel engine, fuel is injected at the end of the compression stroke.
 

 6. 

Gasohol is usually a blend of 20 percent alcohol and 80 percent gasoline.
 

 7. 

Tetraethyl lead is still widely used as an anti-knock additive in gasolines.
 

Matching
 
 
Match the following terms and identifying phrases.
a.
ethanol
d.
gasohol
b.
liquefied petroleum gas
e.
hydrogen
c.
synthetic fuel
 

 8. 

Mixture of gasoline and alcohol.
 

 9. 

Alternate fuel often used in industrial engines.
 

 10. 

Alcohol fuel made from farm crops.
 

 11. 

Highly flammable gas.
 

 12. 

Fuel made from coal or tar sand.
 

Completion
Complete each statement.
 

 13. 

When ______________________________ burns, the only byproducts are water and carbon dioxide.
 

 

 14. 

In a diesel engine, ______________________________ is compressed until it becomes hot enough to ignite the fuel.
 

 

 15. 

The ______________________________ rating of a gasoline measures its ability to resist knock and ping.
 

 

 16. 

The perfect air-fuel ratio for combustion in an engine is called a(n) ______________________________ fuel mixture.
 

 

 17. 

A rich fuel mixture will ______________________________ fuel consumption.
 

 

 18. 

The most common fuel for automotive diesel engines is ______________________________ diesel oil.
 

 

Short Answer
 

 19. 

What can happen when temperatures are cold enough to bring diesel fuel to its cloud point?
 

 20. 

Describe the problems that can be caused by water contamination of diesel fuel.
 



 
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