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11-27

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

 1. 

The catalytic converter is designed to ____.
a.
remove pollutants from the engine’s exhaust
b.
improve the engine’s fuel economy rating
c.
decrease exhaust system backpressure
d.
make it possible to use gasohol as a fuel
 

 2. 

A dual exhaust system is most common on ____ engines.
a.
small
c.
large
b.
diesel
d.
fuel-injected
 

 3. 

On a turbocharger, the ____ prevents producing too much pressure in the combustion chambers.
a.
unloader
c.
relief valve
b.
waste gate
d.
discharge
 

 4. 

Each of the following is a type of supercharger, except:
a.
rotor.
c.
reciprocating.
b.
centrifugal.
d.
vane.
 

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

 5. 

Water and acids in engine exhaust can cause exhaust system parts to fail in a fairly short time.
 

 6. 

The crossover pipe in an exhaust system recirculates hot gases for improved engine performance.
 

 7. 

A supercharger is spun by the vehicle’s exhaust gases.
 

 8. 

In a blow-through turbo system, air and fuel are pressurized at the same time as they pass through the compressor housing.
 

 9. 

A supercharger or a turbocharger is sometimes called a “blower.”
 

 10. 

A nick or dent in a turbocharger turbine wheel can cause severe vibration.
 

Matching
 
 
Identify each of the marked items on the diagram below.
grp001-1.jpg
 

 11. 

Turbo shaft.
 

 12. 

Piston.
 

 13. 

Air in under atmospheric pressure.
 

 14. 

Exhaust flow out of engine.
 

 15. 

Exhaust gas enters exhaust system.
 

 16. 

Turbine housing
 

 17. 

Boost pressure above atmospheric pressure.
 

 18. 

Compressor housing.
 

 19. 

Bearing housing.
 

 20. 

Compressor wheel.
 

 21. 

Turbine wheel spun by exhaust flow.
 

Completion
Complete each statement.
 

 22. 

A knock sensor tells the computer to ______________________________ the timing if the engine starts to knock.
 

 

 23. 

An engine that is turbocharged usually has a(n) ______________________________ compression ratio.
 

 

 24. 

The ______________________________ pipe carries exhaust gases from the exhaust manifold to the catalytic converter.
 

 

 25. 

The exhaust manifold ______________________________ valve aids starting in cold weather.
 

 

 26. 

Heat ______________________________ must always be replaced after exhaust system repairs.
 

 



 
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