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12-22

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

 1. 

Which of the following is an advantage of gasoline injection over a carburetor system?
a.
Better atomization of the fuel.
c.
Increased engine power.
b.
Better fuel distribution.
d.
All of the above.
 

 2. 

Which of the following is not a common method used to control fuel injection systems?
a.
Mechanical system.
c.
Pneumatic system.
b.
Hydraulic system.
d.
Electronic system.
 

 3. 

The ____ is not one of the subsystems of an electronic fuel injection system.
a.
idle solenoid system
c.
sensor system
b.
air induction system
d.
computer control system
 

 4. 

A cold-start injector is activated by a(n) ____.
a.
control relay
c.
oxygen sensor
b.
thermo-time switch
d.
timing circuit
 

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

 5. 

In a CIS injection system, the injectors deliver fuel intermittently.
 

 6. 

In a sequential fuel injection system, the injectors open one after the other, instead of all at one time.
 

 7. 

In a direct injection system, the fuel is forced into the combustion chamber itself.
 

 8. 

In an air induction system, flow of air into the engine is controlled by a throttle valve.
 

 9. 

Vacuum, rather than pressure, is the actuating force behind fuel injection systems.
 

 10. 

A throttle positioner is used to control high-speed operation.
 

Matching
 
 
Match the following terms and identifying phrases.
a.
crankshaft position sensor
e.
airflow sensor
b.
intake air temperature sensor
f.
manifold absolute pressure (MAP) sensor
c.
oxygen sensor
g.
throttle position sensor
d.
engine coolant temperature sensor
 

 11. 

Checks amount of air entering engine.
 

 12. 

Checks exhaust gas for combustion efficiency.
 

 13. 

Measures temperature of air entering engine.
 

 14. 

Monitors throttle plate shaft rotation.
 

 15. 

Detects engine speed.
 

 16. 

Measures vacuum at engine intake.
 

 17. 

Measures engine coolant temperatures.
 
 
Identify each of the marked items on the diagram below.
grp002-1.jpg
 

 18. 

Exhaust gases.
 

 19. 

Outside air.
 

 20. 

Wire to computer.
 

 21. 

Louvered shield.
 

 22. 

Inner chamber.
 

 23. 

Oxygen sensing element.
 

 24. 

Exhaust manifold.
 

Completion
Complete each statement.
 

 25. 

On-off signals from engine sensors are called ______________________________ signals.
 

 

 26. 

A(n) ______________________________ fuel injection system opens and closes injectors independently of the engine’s intake valves.
 

 

 27. 

In a TBI system, fuel is sprayed into the top of the air ______________________________.
 

 

 28. 

Electronic ______________________________ injection systems use one injector for each engine cylinder.
 

 

 29. 

When a(n) ______________________________ fuel injection system is used, fuel is being injected whenever the engine is running.
 

 

 30. 

To dampen pressure pulses in an injection system, a fuel ______________________________ can be used.
 

 



 
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