|
|||||||
|
|
|
|||||
|
|
|||||||
|
|||||||
|
|
|
|||||
|
|
|||||||
1. Technician A says that most gasoline injection systems
inject fuel directly into the
cylinders. Technician
B says that most gasoline injection systems are continuous
flow types. Who
is right?
a. A only
b. B only
c. both A and B
d. neither A nor B
2. The fuel injector solenoid is energized by the
a. ignition switch
b. computer
c. airflow sensor
d. ignition module
3. Technician A says that central fuel injection systems
have one injector for each
cylinder. Technician
B says that electronic injection systems use an electric
fuel pump to provide
the required pressure. Who is right?
a. A only
b. B only
c. both A and B
d. neither A nor B
4. Mechanical injection system injectors are opened by
a. electric solenoids
b. airflow
c. fuel pressure
d. compression pressure
5. In the continuous flow fuel injection system, basic
air/fuel ratio control is provided
by a(n) ______ sensor.
a. pressure
b. engine speed
c. manifold vacuum
d. airflow
6. Electronic fuel injection systems can use
a. one injector per cylinder
b. two injectors for the entire engine
c. one injector for the entire engine
d. any of the above
7. All of the following statements about gasoline fuel injectors are true EXCEPT
a. injectors spray gasoline into the intake manifold
b. injectors can be part of a central fuel system assembly
c. injectors are operated by manifold vacuum
d. injectors can be installed in the intake manifold
8. Technician A says that all gasoline injector systems
use higher pressures than diesel
injection systems.
Technician B says that some gasoline injection systems use
higher pressures than
diesel injection systems. Who is right?
a. A only
b. B only
c. both A and B
d. neither A nor B
9. All of the following statements about diesel injectors are true EXCEPT
a. diesel injectors are operated by fuel pressure
b. diesel injectors spray fuel directly into the cylinder
c. diesel injectors are opened electrically
d. diesel injectors are closed by spring pressure
10. TBI stands for
a. throttle body injection
b. throttle bypass injection
c. throttle block-learn injection
d. timed body injection
11. The amount of fuel supplied by an injector is determined by
a. the fuel pressure regulator
b. the computer and sensor input signals
c. the injector pulse width
d. all of the above
12. All of the following are output actuators EXCEPT
a. injectors
b. fan relay
c. ignition module
d. distributor
13. All of the following are input sensors EXCEPT
a. transmission pressure switch
b. ignition pickup coil
c. mixture control solenoid
d. crankshaft position sensor
14. Technician A says that there are high and low pressure
injection systems.
Technician B says that
there are continuous and timed injection systems.
Who is right?
a. A only
b. B only
c. both A and B
d. neither A nor B
15. Technician A says that fuel injection is used to obtain
precise air/fuel
ratios. Technician
B says that fuel injection systems are designed only
to produce greater horsepower.
Who is right?
a. A only
b. B only
c. both A and B
d. neither A nor B
16. Technician A says that stoichiometric air/fuel ratios are
always maintained
by the injection system.
Technician B says that stoichiometric ratios are
maintained unless the
engine is cold or under load. Who is right?
a. A only
b. B only
c. both A and B
d. neither A nor B
17. Correct stoichiometric air/fuel ratio is
a. 12.5:1
b. 14.7:1
c. 16.6:1
d. 18.2:1
18. The length of time an injector is energized is known as
a. pulse width
b. closed loop
c. open loop
d. dwell time
19. All of the following statements about fuel are true EXCEPT
a. fuel must be vapourized to burn
b. air/fuel ratios indicate the amount of vapourization
c. air/fuel ratios are closely controlled to reduce emissions
d. fuel must be atomized to burn
20. All of the following about fuel pressure regulators are true EXCEPT
a. all regulators have an internal spring
b. some regulators release pressure into a tank return hose
c. some regulators have a vacuum connection
d. some fuel injection systems have no regulator
21. Fuel pressure in a CIS system is controlled by by a
a. mechanical airflow sensor
b. mass air flow sensor
c. electronic control unit
d. electric solenoid
22. An electronic injector clicks during operation. Technician
A says to replace the
injector. Technician
B says that it is operating properly. Who is right?
a. A only
b. B only
c. both A and B
d. neither A nor B
23. If the inside of a fuel tank is rusted, the tank should be
a. steam cleaned
b. soldered
c. blown out with compressed air
d. replaced
24. Injectors in the continuous fuel injection system are opened by
a. air pressure
b. fuel pressure
c. spring pressure
d. solenoids
25. All of the following about intake manifold vacuum are true EXCEPT
a. low load results in high vacuum
b. vacuum increases as load increases
c. high load causes low vacuum
d. vacuum is inversely proportional to load