AUT108 Mid Term Exam

In distributorless ignition systems, signals from sensors are to calculate engine _______ and determine engine _______.

Select one:

• Torque, speed

• Speed, position

• Firing order, position

• Firing order, dwell angle

The primary winding of the ignition coil has approximately _______ turns of enameled copper wire.

Select one:

• A few hundred

• 1,000

• 15,000

• None of the above

Pre-ignition occurs before normal combustion, when something in the combustion chamber heats up enough to ignite the mixture before the spark plug fires.

Select one:

• True

• False

The most important job of the fuel system is to optimize engine performance while:

Select one:

• keeping fuel consumption and emissions to a minimum.

• keeping car owners happy with acceptable vehicle performance.

• making sure all DMV rules are adhered to.

• making sure the highest miles-per-gallon are achieved.

After replacing an external fuel filter, check it for leaks by:

Select one:

• cranking the engine for 5 seconds.

• cycling the ignition key on and off several times.

• starting the vehicle and watching for drops of fuel.

• wiggling the connections and watching for moisture.

EFI systems employ electronically controlled injectors to spray the fuel into the ________.

Select one:

• Intake system

• Cylinder directly

• Either A or B

• None of the above

Tech A says that electric fuel pump pressure can often be tested by accessing a test port. Tech B says that electric fuel pump volume can be affected by the condition of the fuel injectors. Who is correct?

Select one:

• Tech A

• Tech B

• Both Techs A and B

• Neither Tech A nor B

Tech A says that fuel injectors can be checked for the specified amount of resistance. Tech B says that an injector pressure drop test can determine if an injector is restricted with deposits. Who is correct?

Select one:

• Tech A

• Tech B

• Both A and B

• Neither A nor B

When the voltage reaches the point where current is flowing in the secondary circuit, the _______ drops to a much lower level, just sufficient enough to sustain current flow and the spark.

Select one:

• Reserve voltage

• Low voltage

• High voltage

• Required voltage

Which of these fuel characteristics helps to prevent the air fuel mixture from spontaneously igniting in the combustion chamber?

Select one:

• The ignition temperature

• The cetane rating

• The octane rating

• The antiknock rating