CH.14 REVIEW

1.Which of the following statements about the starting/cranking system is correct?

On ECM starting systems, the ECM controls the operation of a relay to energize the starter circuit.

Data supplied by other onboard network modules, along with control algorithms in the module, determine when and for how long the starter will crank.

A control circuit determines when and if the cranking circuit will function.

All of the choices are correct.

3.What is the minimum life expectancy for a modern starter?

2 years with 4,000 start cycles

3 years with 5,000 start cycles

4 years with 7,000 start cycles

5 years with 9,000 start cycles

4.Which of the following common electric motors develop the highest torque and are used as starter motors?

Stepper

Compound

Shunt (parallel wound)

Series

5.Which of the following statements concerning current flow for a series motor is correct?

Current passes through the armature via the commutator and leaves through the second brush connected to the field winding.

A magnetic field is created in the armature.

Current passes through the windings of the field coils.

All of the choices are correct.

8.Which of the following statements about the commutator is correct?

The commutator assembly presses onto the armature shaft.

The commutator is made up of heavy copper segments separated from each other and the armature shaft by insulation.

The commutator segments connect to the ends of the armature windings.

All of the choices are correct.

9.Which of the following statements about starter control circuits is correct?

In its most basic form, the starter control circuit has an ignition switch directly controlling the starter solenoid to operate the starter motor.

In modern heavy vehicles, the circuits are more complex, as relays and control circuits, such as transmission neutral and clutch switches, are added to improve reliability and the safety of vehicles.

The latest models of vehicles use an electrical system control module, which interfaces with the on-board vehicle network that receives data from various sensors, and various sensors to control the operation of the starter control circuit.

All of the choices are correct.

10.A possible cause of a solenoid clicking and chattering is:

loose or corroded battery terminals.

short in the starter.

an open circuit.

a slipping pinion.

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CH.14 REVIEW

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