Electrical/Electronic Systems - Chapters 54 and 55 - Chapter Quiz Questions

rotor; stator

A magnetic field created in the _____________ is used to induce a voltage in the __________. a. stator; rear housing b. diodes; stator c. rotor; stator d. drive-end frame; OAD

Rotor

A magnetic field is created in the _________ in an alternator (AC alternator). a. Stator b. Diodes c. Rotor d. Drive-end frame

Soldered on

How are new slip rings attached to the rotor core during alternator rebuilding? a. Machine clamped b. Soldered on c. Crimped on d. epoxy glue

Any of the above

How does the computer interface with the alternator? a. The computer can actuate the charging system b. The computer can monitor the operation of the alternator c. The computer can control the operation of the alternator d. Any of the above

Diodes inside the alternator

How is the AC voltage produced in the alternator changed to DC voltage? a. Mechanical switches b. Alternating brushes c. Slip ring rotation d. Diodes inside the alternator

2 to 5 A

How much current flows through the alternator brushes? a. All of the alternator output flows through the brushes b. 25 to 35 A, depending on the vehicle c. 10 to 15 A d. 2 to 5 A

Stator

Operating an alternator in a vehicle with a defective battery can harm the _________. a. Diodes (rectifier bridge) b. Stator c. Voltage regulator d. Brushes

Technician A only

Technician A says that a voltage drop test of the charging circuit should only be performed when current is flowing through the circuit. Technician B says to connect the leads of a voltmeter to the positive and negative terminals of the battery to measure the voltage drop of the charging system. Which technician is correct? a. Technician A only b. Technician B only c. Both Technicians A and B d. Neither Technician A nor B

Technician B only

Technician A says that a wye-wound stator produces more maximum output than the same alternator equipped with a delta-wound stator. Technician B says that an alternator equipped with a delta-wound stator produces more maximum output than a wye-wound stator. Which technician is correct? a. Technician A only b. Technician B only c. Both Technicians A and B d. Neither Technician A nor B

Any of the above

What is/are used to help control the heat created in the alternator? a. External fan b. Internal fan c. Coolant cooled d. Any of the above

A load tester

When performing an alternator output test, which tool should the technician choose? a. An electronic torque wrench b. An ohmmeter c. A load tester d. A vacuum gauge

Five amperes greater than the accessory load

When testing an alternator minimum required output, what is the acceptable reading? a. 2 to 5 amperes b. Five amperes greater than the accessory load c. Over 100 amperes higher than the accessory load d. Less than 3 amperes

Defective (shorted-to-ground)

When testing an alternator rotor, if an ohmmeter shows zero ohms with one meter lead attached to the slip rings and the other meter lead touching the rotor shaft, the rotor is _________. a. Okay (normal) b. Defective (shorted-to-ground) c. Defective (shorted-to-voltage) d. Okay (rotor windings are open)

Groove color change

Which of the following would not be used to check drive belt wear? a. Groove color change b. A tension gauge c. A belt wear gauge d. Belt deflection between two pulleys

To create an electrical load for the alternator

Why should the lights be turned on when checking for ripple voltage or alternating current from the alternator? a. To warm the battery b. To check that the battery is fully charged c. To create an electrical load for the alternator d. To test the battery before conducting other tests

Carbon

Alternator brushes are constructed from _________. a. Copper b. Aluminum c. Carbon d. Silver-copper alloy

13.5 to 15 volts

An acceptable charging circuit voltage on a 12 volt system is _________. a. 13.5 to 15 volts b. 12.6 to 15.6 volts c. 12 to 14 volts d. 14.9 to 16.1 volts

All of the above

An alternator could test as producing lower-than-normal output, yet be okay, if the _________. a. Battery is weak and defective b. Engine speed is not high enough during testing c. Drive belt is loose or slipping d. All of the above

0.551/OL

An alternator diode is being tested using a digital multimeter set to the diode-check position. A good diode will read _________ if the leads are connected one way across the diode and _________ if the leads are reversed. a. 300/300 b. 0.475/0.475 c. OL/OL d. 0.551/OL

Both Technicians A and B

Technician A says that an alternator overrunning pulley is used to reduce vibration and noise. Technician B says that an overrunning alternator pulley or dampener uses a one-way clutch. Which technician is correct? a. Technician A only b. Technician B only c. Both Technicians A and B d. Neither Technician A nor B

Both Technicians A and B

Technician A says that the computer can be used to control the output of the alternator by controlling the field current. Technician B says that voltage regulators control the alternator output by controlling the field current through the rotor. Which technician is correct? a. Technician A only b. Technician B only c. Both Technicians A and B d. Neither Technician A nor B

Technician B only

Technician A says that the diodes regulate the alternator output voltage. Technician B says that the field current can be computer controlled. Which technician is correct? a. Technician A only b. Technician B only c. Both Technicians A and B d. Neither Technician A nor B

Both Technicians A and B

Technician A says that two diodes are required for each stator winding lead. Technician B says that diodes change alternating current into direct current. Which technician is correct? a. Technician A only b. Technician B only c. Both Technicians A and B d. Neither Technician A nor B

Stator

The alternator output current is produced in the _________. a. Stator b. Rotor c. Brushes d. Diodes (rectifier bridge)

as a replaceable rectifier component

The diodes are usually replaced__________ a. individually only if open b. individually only if shorted c. as a replaceable rectifier component d. as part of the stator assembly

10% of the rating output of the alternator

The maximum allowing alternating current (AC) in amperes that is being sent to the battery from the alternator is _________. a. 0.4 A b. 1 to 3 A c. 3 to 4 A d. 10% of the rating output of the alternator

any of these would increase the output

The output of an alternator can be increased by increasing the ____________ of the alternator. a. speed of rotation b. number of conductors in the starter c. current in the rotor d. any of these would increase the output

All of the above

The voltage regulator controls current through the _________. a. Alternator brushes b. Rotor c. Alternator field d. All of the above

AC volts

To check for ripple voltage from the alternator, connect a digital multimeter (DMM) and select _________. a. DC volts b. AC volts c. DC amps d. AC amps

DC volts

To check the charging voltage, connect a digital multimeter (DMM) to the positive (+) and the negative (-) terminals of the battery and select _________. a. DC volts b. AC volts c. DC amps d. AC amps