Deck 7: Charging Systemscharging System Testing and Service

Question 1

Technician A says before performing a voltage output test, a visual inspection and preliminary check of the charging system should be done. Technician B says a voltage output test will indicate if the charging system is working properly. Who is correct?

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

Answer 1

C

Question 2

Technician A says a shorted diode may be indicated by a whining noise. Technician B says a squealing noise may indicate a loose belt. Who is correct?

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

Answer 2

C

Question 3

The hybrid AC generator design consists of a rotor assembly with both permanent magnet and wire wound sections.

Answer 3

True

Question 4

Any sensing wire voltage drops will increase the system voltage by the amount of the drop.

Question 5

Excessive output can be caused by a faulty battery.

Question 6

A ground circuit voltage drop test taken on a vehicle's alternator indicates a 0.965V drop. Technician A says this could cause a problem in the alternator's field current. Technician B says this could affect the output circuit of the alternator. Who is correct?

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

Question 7

Rotor speed is a factor in the maximum available output of the AC generator.

Question 8

AC generator output decreases as field current increases.

Question 9

What components make up the AC generator field circuit?

A) Battery, stator, and diodes
B) Battery, regulator, and stator
C) Battery, rotor, and regulator
D) Regulator, stator, and rotor

Question 10

Technician A says a full fielding test should be performed only if the charging system fails the output test. Technician B says during the full field test the field windings are constantly energized with full battery voltage. Who is correct?

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

Question 11

What type of voltage is the output at the "Bat" terminal of the AC generator?

A) DC
B) AC
C) Three-phase unrectified
D) None of the above

Question 12

The charging system of a vehicle is producing 100 amps and 12.4 volts at 1500 RPM with all electrical accessories turned "on." The charging system output specification for this vehicle is 110 amps. Technician A says the alternator needs to be replaced. Technician B says the electrical demand of the vehicle may be exceeding the capacity of the charging system. Who is correct?

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

Question 13

A scan tool can be used to help diagnose charging system problems on most modern vehicles.

Question 14

Sensing voltage is used by the regulator to determine how much field current is necessary.

Question 15

If the output current is greater than needed, system voltage will fall below specification.

Question 16

Voltage regulation is controlled by the PCM on many vehicles today.

Question 17

Why should an AC generator never be operated open-circuit?

A) It could overcharge the battery
B) It could burn out electronic components
C) It could damage the AC generator stator
D) None of the above

Question 18

Less than rated output during full fielding indicates need for a new voltage regulator.

Question 19

Technician A says when testing the voltage output, if the charging voltage is too high, the cause could be an open field wire from the regulator. Technician B says a loose or glazed drive belt could be the cause of too high charging voltage. Who is correct?

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

Question 20

A computer-controlled charging system is undercharging. A lab scope connected to the ground side of the alternator field indicates a 90 percent duty-cycle. Technician A says the alternator may need to be replaced. Technician B says the on-board computer may need to be replaced. Who is correct?

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

Question 21

The HEV uses an inverter to invert the DC voltage from the HV battery into ____ voltage for use by the motors.

A) DC/DC
B) HV DC
C) LV DC
D) three-phase AC

Question 22

The current output test will determine the maximum output of the ____.

A) battery
B) AC generator
C) regulator
D) carbon pile

Question 23

Technician A says damage can occur to solid-state circuitry if the charging voltage is allowed to get too high. Technician B says damage can occur if the engine ran with the battery disconnected. Who is correct?

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

Question 24

Where is the output of an AC generator created?

A) The stator
B) The rotor
C) The housing
D) The brushes

Question 25

Technician A says when testing the charging system, the state of charge of the battery is not a concern. Technician B says to test the battery only if the charging system tests fail. Who is correct?

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

Question 26

All charging systems use the principle of electromagnetic ____ to generate electrical power.

A) motion
B) reduction
C) induction
D) conductance

Question 27

Technician A says a scan tool may be used to full field some alternators. Technician B says a field current draw test indicates if there is current available to the field windings. Who is correct?

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

Question 28

The voltage drop test determines if the battery, regulator, and AC generator are all operating at ____.

A) odds with each other
B) the same potential
C) the same temperature
D) differing current levels

Question 29

The ____ creates the rotating magnetic field of the AC generator.

A) rotor
B) rectifier
C) commutator
D) stator

Question 30

A ____ noise can be caused by shorted diodes or stator, or by a worn rotor bearing.

A) squealing
B) whining
C) whirring
D) rattling

Question 31

Technician A says when testing, the ground side, voltage drop should be less than 0.2 volt. Technician B says the total insulated system drops should be less than 0.7 volt. Who is correct?

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

Question 32

A(n) ____ AC generator is usually found in applications that do not require high-amperage output.

A) delta-wound
B) wye-wound
C) phase
D) asynchronous

Question 33

The ____ is used to make a quick determination about whether the charging system is working properly.

A) voltage output test
B) visual inspection
C) no-load test
D) load test

Question 34

What does an increase in regulator field resistance mean?

A) More output current is desired
B) The rotor is turning too slowly
C) Less output current is desired
D) B+ sensing voltage is lower than specified

Question 35

Symptoms of ____ include slow-cranking, discharged battery, low instrument panel ammeter or voltmeter readings, and charge indicator lamp on.

A) overcharging
B) excessive current drain
C) undercharging
D) belt wear

Question 36

Technician A says the regulator is the cause if full fielding with the regulator bypassed produces lower than specified output. Technician B says a full field test will isolate the problem if it is in the AC generator or the regulator. Who is correct?

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

Question 37

Because field current is required to produce a magnetic field, it is necessary to determine if current is flowing to the ____.

A) field coil
B) multiplying coil
C) carbon pile
D) alternator

Question 38

Technician A says a diode can be tested with a DMM that has a diode test setting. Technician B says when testing a diode with a DMM that has a diode test setting the meter should read approximately 0.6V in one direction and 0 when the leads are reversed. Who is correct?

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

Question 39

What component carries the magnetic field current in an AC generator?

A) The stator
B) The rotor
C) The housing
D) The brushes

Question 40

The actual AC generator output should be at least 10% to 20% greater than the ____.

A) battery
B) regulator
C) alternator input
D) load demand

Question 41

In a HEV, ____ helps minimize energy loss by recovering the energy used to slow the vehicle.

A) friction braking
B) hydraulic braking
C) inductive braking
D) regenerative braking

Question 42

The ____ converter allows the conversion of electrical power between the high-voltage (HV) direct current system and the low-voltage (LV) direct current system.

A) AC/DC
B) DC/DC
C) HV/LV
D) ISG

Question 43

List the areas that could cause charging voltage to be too high.

Question 44

The input voltage to the AC generator is called ____ voltage.

A) sense
B) system
C) increasing
D) charging

Question 45

What are the main components of the AC generator?

Question 46

The voltage regulator controls the output voltage of the AC generator, based on charging system demands, by controlling what?

Question 47

It is the vehicle's ____ that generates the current to operate the electrical accessories while the engine is running.

A) charging system
B) computer
C) ignition system
D) battery storage

Question 48

If the solid-state electronic voltage regulator is not in or on the alternator, where would it be located?

Question 49

What may be the cause of too low charging voltage?

Question 50

When the engine is running, the ____ spins the rotor inside the stator windings.

A) drive belt
B) battery
C) armature
D) solenoid

Question 51

Explain function of the current output test.

Question 52

All charging systems use what principle to generate the electrical power?

Question 53

What factors affect the amount of current produced?

Question 54

The ____ circuit supplies the initial current for the field coil that starts the buildup of the magnetic field.

A) starter
B) excitation
C) preexcitation
D) charging

Question 55

Describe how the voltage regulator controls AC generator output?

Question 56

In an electronic regulator, when the AC generator output is controlled by varying the amount of time the field coil is energized, what is this called?

Question 57

How many pairs of diodes does full-wave rectification require in an AC generator?

Question 58

Explain the meaning of regenerative braking.

Question 59

In what type of stator, is one lead from each winding is connected to one common junction?

Question 60

What is the name of the component that creates the rotating magnetic field of the AC generator?

Question 61

Describe how to perform the charging system requirement test.