Question 1

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

Accepted Answer

The question states that the inverter is used to convert DC voltage from the battery into voltage for use by motors, which implies that the motors run on AC voltage. Therefore, choice D, three-phase AC, is the correct answer. Choices A, B, and C are not correct as they all involve DC voltage, which is not suggested to be the type of voltage used by the motors.

Question 2

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

Accepted Answer

The current output test is used to determine the maximum output of the AC generator. The battery, regulator, and carbon pile are not directly involved in this test.

Question 3

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?

Accepted Answer

Both technicians are correct. High charging voltage can damage solid-state circuitry, and running an engine with the battery disconnected can also cause damage to the vehicle's electrical system.

Question 4

Where is the output of an AC generator created?

Accepted Answer

The output of an AC generator is created in the stator, which contains the stationary coils of wire that surround the rotor. As the rotor spins, it creates a rotating magnetic field that induces an alternating current in the stator coils.

Question 5

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?

Accepted Answer

The state of charge of the battery is a concern when testing the charging system because a discharged or weak battery can affect the test results. It is also recommended to test the battery first before the charging system to ensure it is in good condition, as a faulty battery can lead to incorrect diagnosis of charging system issues.

Question 6

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

Accepted Answer

Charging systems use electromagnetic induction to generate electrical power. This is accomplished through the use of coils of wire and magnets. As the magnets move past the coils or the coils move past the magnets, a magnetic field is created which induces an electrical current in the wire. This current can be used to charge batteries or power electrical devices.

Question 7

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?

Accepted Answer

Technician A is correct that a scan tool may be used to full field some alternators. Technician B is correct that a field current draw test indicates if there is current available to the field windings. Therefore, both technicians are correct.

Question 8

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

Accepted Answer

The voltage drop test measures the voltage at various points along the electrical system to see if there is a difference in potential. If there is, it indicates that there is a problem with the system, such as a bad connection or a faulty component. A consistent voltage throughout the system indicates that it is operating properly and all components are at the same potential. Therefore, the correct answer is B - the same potential.

Question 9

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

Accepted Answer

The rotor is the part of an AC generator that rotates and creates a rotating magnetic field, which induces an alternating current in the stator windings.

Question 10

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

Accepted Answer

A whining noise in the context of electrical or mechanical systems, such as those involving diodes, stators, or rotor bearings, typically indicates a problem with the components that can cause such a noise when they are malfunctioning or worn out.

Question 11

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?

Accepted Answer

Both technicians are correct. A voltage drop of less than 0.2 volt on the ground side ensures a good connection, while a total insulated system drop of less than 0.7 volt ensures that the electrical system is functioning properly.

Question 12

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

Accepted Answer

A wye-wound AC generator operates at a lower voltage and is generally used for lower amperage applications. This is due to the fact that it has a lower output voltage because the coils are connected in a wye configuration, which is a three-phase AC generator where the three coils are connected in a triangle configuration with a neutral wire, which reduces the output voltage. Delta-wound generators have coils wired in a triangle, which results in a higher output voltage, and asynchronous generators generate AC voltage by rotating the rotor at a different speed than the stator. Phase is not a type of AC generator.

Question 13

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

Accepted Answer

A voltage output test is used to quickly determine if the charging system is functioning properly by measuring the voltage output of the alternator.

Question 14

What does an increase in regulator field resistance mean?

Accepted Answer

An increase in regulator field resistance would mean that less current is allowed to flow through the field circuit, thereby reducing the generator's output current.

Question 15

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

Accepted Answer

The symptoms described are indicative of an undercharging system, with the battery not receiving sufficient charge from the alternator/generator. Overcharging may result in a boiling battery or burnt-out bulbs, while excessive current drain may cause the battery to run down quickly without necessarily affecting the charging system itself. Belt wear may cause other issues but is unlikely to affect the charging system in such a specific way.

Question 16

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?

Accepted Answer

Technician B is correct because a full field test helps determine if the issue lies within the AC generator or the regulator by bypassing the regulator and checking the generator's output. Technician A is incorrect because if bypassing the regulator results in lower output, the problem is likely with the generator, not the regulator.

Question 17

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

Accepted Answer

The field current is required to produce a magnetic field, and this current flows through the field coil. Therefore, in order to determine if current is flowing to the field coil, we can check for the presence of a magnetic field. The other choices (multiplying coil, carbon pile, alternator) do not relate to the flow of current to the field coil.

Question 18

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?

Accepted Answer

Technician A is correct, a diode can be tested with a DMM that has a diode test setting.
Technician B is also correct, 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.

Question 19

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

Accepted Answer

The rotor carries the magnetic field current in an AC generator. It is the rotating part of the generator that contains the magnets or electromagnets that create the magnetic field that interacts with the stator windings to produce the electrical output.

Question 20

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

Accepted Answer

The actual AC generator output should be at least 10% to 20% greater than the load demand to ensure that the electrical system operates efficiently and reliably, with a margin of safety.

Quiz 7: Charging Systemscharging System Testing and Service