Deck 30: Charging System Fundamentals

Question 1

While having a discussion, Technician A says that when charging system voltage is low and accessories are loading the system, the regulator increases the AC generator current output. Technician B says that if system voltage is normal and there is a heavy accessory load, the AC generator will run the accessories with little drain on the battery. Who is correct?

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

Answer 1

C

Question 2

When the rotor spins, an alternating north/south polarity is created (AC current). This is called ____________________.

Answer 2

sine wave voltage

Question 3

A(n) ____________________ resembles an electric motor, having a stationary magnetic field with an armature output winding spinning inside.

Answer 3

DC generator

Question 4

When there is a charging system problem, which of the following systems is LEAST-Likely to indicate a problem?

A)Heat sink
B)Warning light
C)Ammeter
D)Voltmeter

Question 5

While having a discussion, Technician A says that voltage will be closer to 14.4 to 14.8 volts when the system is very cold and closer to 13.5 volts when the system is hot. Technician B says that voltage is closer to 13.5 volts when the system is very cold and closer to 15.5 volts when the system is hot. Who is correct?

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

Question 6

When current passes through a coiled wire, a magnetic field builds up around the wire. This is called a(n) ____________________.

Question 7

The ____________________ includes an alternating current (AC) generator (sometimes called an alternator), a voltage regulator, a dash light or gauge, and related wiring.

Question 8

The component MOST-Likely to be used to help dissipate the heat that occurs as electrons try to pass the diode is the:

A)slip ring
B)heat sink
C)alternator
D)stator

Question 9

Electronic voltage regulators were phased in during the late 1960s.

Question 10

An alternator is an electronic component that only conducts electricity when a certain voltage is reached.

Question 11

Carbon brushes that ride on the slip rings provide electricity to the field coil.

Question 12

The stator fits in the frame of the AC generator, between the front and rear halves of the cast aluminum housing.

Question 13

An AC generator produces ____________________.

Question 14

The component that MOST-Likely controls the current passing through the windings of the electromagnetic field in the rotor is the:

A)diode
B)stator
C)voltage regulator
D)heat sink

Question 15

All of the following statements are true EXCEPT:

A)the powertrain control module (PCM), or voltage regulator controls the current passing through the windings of the electromagnetic field in the rotor.
B)the voltage regulator can be located on either the ground side or the positive side of the field circuit.
C)electronic voltage regulation requires no moving parts, so it can cycle electronically between 10 and 7,000 times per second.
D)turning the AC generator rapidly on and off to achieve a precise output is called voltage width modulation.

Question 16

All of the following statements are true EXCEPT:

A)when a stator is wound with a delta connection, the leads of the windings are connected together in series.
B)a wye (Y) winding is used in high-output AC generator.
C)a delta winding can put out about one-third more current at highway speeds than a Y-wound stator.
D)because it is about one-third less efficient at idle speed, there is a problem with delta-wound AC generators.

Question 17

he charging system works hardest after the engine is first started as well as when all electrical options are operating.

Question 18

A ____ is a one-way check valve for electricity.

A)slip ring
B)heat sink
C)diode
D)stator

Question 19

The ____ is a rotating electromagnetic field, and as it spins, its magnetic field cuts across the windings of the stator.

A)commutator
B)rotor
C)slip ring
D)diode

Question 20

Which of the following statements is LEAST-Likely true?

A)The typical electrical requirements of a 1970 automobile amounted to about 500 watts.
B)Today, it is unusual to find 150-amp AC generators on passenger vehicles.
C)Alternators (AC generators) on 1970s vehicles typically put out from 35 to 50 amps.
D)As vehicles evolve, electrical demand is projected to increase to more than double today's level, that is, to 10,000 watts or more.

Question 21

What are some of the drawbacks of the generator when compared to the alternator?

Question 22

What is the purpose of an alternator fan?

Question 23

What is the difference between an AC generator and a generator?

Question 24

What is an advantage of a voltmeter?

Question 25

What are the disadvantages of an ammeter?