Deck 11: Charging and Starter Circuits

Question 1

Why does a starter motor use multiple armature segments?

A) To increase maximum rpm.
B) To reduce current draw under load.
C) To produce uniform constant torque.
D) To maximize heat transfer from the rotor.

Answer 1

C

Question 2

Where should voltmeter test leads be placed to check for voltage drop?

A) Across the component or connection being tested.
B) From the positive side of the component to the battery negative post.
C) In series with the component being tested.
D) From the positive side of the component to chassis ground.

Answer 2

A

Question 3

What is the usual maximum cranking cycle recommended for a starter motor on a mobile, light duty diesel engine?

A) Up to 2 minutes cranking between 30 second rest
B) Under continuous loads.
C) 5 seconds or less cranking between 30 second rest.
D) Up to 30 seconds cranking between 2 minute rest.

Answer 3

D

Question 4

How does a solid state voltage regulator manage alternator output voltage?

A) By rapidly switching the rotor field winding off and on.
B) By acting as a digital power supply.
C) By rapidly switching the output voltage off and on.
D) By filtering the output.

Question 5

What are the two types of stator windings used in a three phase alternator?

A) Star and diamond.
B) Parallel and series.
C) Wye and delta.
D) Three phase and single phase.

Question 6

What are the wire bundles around the inside perimeter of the alternator called?

A) Stator windings.
B) Field windings.
C) Generator coils.
D) Rotor winding.

Question 7

What approach does manufacturer SIS often mandate when troubleshooting starting circuit issues?

A) Isolate and test parts individually.
B) Swap out components one by one until the fault is found.
C) Consulting online resources to find common issues.
D) A software-driven, systematic approach.

Question 8

How many amps does a typical starter motor draw?

A) 40.
B) less than 40.
C) 4000.
D) 400.

Question 9

What is the most common cause of cranking circuit malfunctions?

A) Sulfated batteries.
B) Battery terminal issues.
C) Starter motor mechanical failures.
D) Corrosion on starter motor or soleniod terminals.

Question 10

What starter design technology allows for smaller, lighter starter motors?

A) AC induction starters.
B) Reduction-gearing starters.
C) Shaded pole starters.
D) BLDC motors.

Question 11

Where in the alternator are the field windings located?

A) Stator.
B) Alternates between the stator and rotor.
C) Rotor.
D) Either the stator or the rotor but not both.

Question 12

Under what condition should voltage-drop testing be performed?

A) With ignition switch off.
B) With the circuit energized.
C) With the ignition switch in accessory position.
D) With the battery disconnected.

Question 13

What do the alternator slip rings and brushes connect to?

A) Ground.
B) Stator windings.
C) Alternator output circuit.
D) Rotor field windings.

Question 14

Converting both positive and negative alternating current nodes to DC current is referred to as:

A) Half wave rectification.
B) Three phase rectification.
C) Full polarity rectification.
D) Full wave rectification.

Question 15

Which of the following best describes the role of voltage in an electrical circuit?

A) Current.
B) Pressure.
C) Polarity.
D) Potential.

Question 16

Most alternators use how many diodes to maintain a more constant output voltage?

A) 4
B) 8
C) 3
D) 6

Question 17

What is an alternator in which the rotor field windings are held stationary known as?

A) Brushless alternator.
B) Rotorless alternator.
C) Static field alternator.
D) Static rotor alternator.

Question 18

What component is incorporated into a insulated heat sink mounted on the end frame assembly?

A) Rectifier bridge.
B) Resistor bridge.
C) Wheatstone bridge.
D) Diode array.

Question 19

What voltage should a fully charged 12 volt lead acid battery in good condition measure when tested?

A) 12.0v
B) 13.2v
C) 12.0v to 13.2v depending on the quality of the battery.
D) 12.6v

Question 20

What are the two windings in a starter solenoid known as?

A) Pull-in and hold-in.
B) Positive and negative.
C) High pull and low pull.
D) DC and AC.

Question 21

Technician A states that the starter motor is over-speed protected by an overrunning clutch. Technician B states that the starter pinion gear remains engaged with the flywheel even when the overrunning clutch is activated. Which technician is correct?

A) Technician A only.
B) Technician B only.
C) Both A and B.
D) Neither A nor B.

Question 22

Technician A states that overcharging a lead acid battery can result in electrolyte loss within the cells. Technician B states that overcharging a lead acid battery causes sulfation. Who is correct?

A) Technician A only.
B) Technician B only.
C) Both A and B.
D) Neither A nor B.