Ch. 54 Starting/Charging Systems
What does the rotating magnet in a very simple alternator induce in the stationary windings? a. An alternating current flow. b. A variable current flow. c. A constant current flow. d. A direct current flow.
a. An alternating current flow.
A _____ will contain a small electromagnetic coil using very ______ wire, whereas a _____ uses _____ wire in larger coils. a. Fuel injector; fine; starter motor; heavy b. Starter motor; fine; fuel injector; heavy c. Fuel injector; heavy; starter motor; fine d. Starter motor; heavy; fuel injector; fine ANS: a
a. Fuel injector; fine; starter motor; heavy
It is desirable for a starter motor to produce: a. High turning effort at low speed b. Low turning effort at low speed c. Low turning effort at high speed d. High turning effort at high speed
a. High turning effort at low speed
On modern vehicles, what replace the voltage regulator? a. Power train control module (PCM) or body control module (BCM) b. Electronic control module (ECM) c. Electromotive force (EMF) d. Counter-electromotive force (CEMF)
a. Power train control module (PCM) or body control module (BCM)
How many phases does a typical automotive alternator have? a. Three. b. Two. c. One. d. None.
a. Three.
Which of the following is NOT a typical electrical problem that can cause starting system problems? a. Loose, dirty, or corroded terminals and connectors b. Engine mechanical fault c. A discharged or faulty battery d. A faulty control circuit or starter motor
b. Engine mechanical fault
Technician A says that current flow is created in the alternator's rotor. Technician B says that current flow is created in the alternator's stator. Who is correct? a. Technician A b. Technician B c. Both Technicians A & B d. Neither Technician A nor B
b. Technician B
On some vehicles, the power train control module (PCM) is able to control the level of ______ at which the battery is charged. a. Current flow b. Voltage c. Both A and B d. Neither A nor B
c. Both A and B
Tech A says that some corrosion that exists in battery cables cannot be seen because it is covered beneath the insulation of the cables. Tech B says that an engine cranking voltage drop test is the best way to detect high resistance caused by corrosion. Who is correct? a. Tech A b. Tech B c. Both Techs A and B d. Neither A nor B
c. Both Techs A and B
In a simple solenoid, insulated wire is wound _______ around a _____ cylinder form. a. Once; hollow b. Once; solid c. Many times; hollow d. Many times; solid
c. Many times; hollow
The stator is made up of: a. Laminated iron core and 3 phase windings. b. 3 phase windings and end frames. c. Laminated core and bearings. d. Laminated core and permanent magnet.
a. Laminated iron core and 3 phase windings.
Tech A states that a diode allows current to flow in one direction but blocks the flow of current in the other direction. Tech B states that a three-phase bridge rectifier as a minimum of three diodes. Who is correct? a. Tech A b. Tech B c. Both A and B d. Neither A nor B
a. Tech A
Technician A says that the slip rings allow current to flow form the stationary end frame to the moving rotor. Technician B says that the stator is a rotating component in the alternator. Who is correct? a. Technician A b. Technician B c. Both Technician A & B d. Neither Technician A nor B
a. Technician A
There are two types of drivebelts. What are they? a. V-type and serpentine type. b. W-type and V-type. c. X-type and serpentine type. d. W-type and serpentine type.
a. V-type and serpentine type.
No matter what direction the current is flowing in the stator windings, the diodes in a rectifier only allow current to flow into the rectifier and out of the rectifier in ______ direction(s). a. one b. two c. three d. four
a. one
During cranking the starter motor pinion gear meshes with the: a. ring gear. b. cluster gear. c. idler gear. d. timing gear.
a. ring gear.
When doing a voltage drop test, the reading is 2.7 volts across the circuit. How many volts are going to the load? a. 12 volts b. 9.3 volts c. 8.3 volts d. 3.7 volts
b. 9.3 volts
Once the cranking circuit is completed, current flows form the battery to the ______. a. Permanent magnet fields b. Armature c. Both are correct d. Neither are correct
b. Armature
If the vehicle was equipped with a standard transmission, then a clutch switch was installed such that it was ________ by ________. a. Opened; pressing the clutch pedal to the floor b. Closed; pressing the clutch pedal to the floor c. Closed; releasing the clutch pedal d. None of the above
b. Closed; pressing the clutch pedal to the floor
Which of the following statements is correct? a. Completely remove the battery prior to disconnecting the alternator. b. Disconnect the battery negative terminal prior to disconnecting the alternator. c. Ensure that the battery is discharged prior to disconnecting the alternator. d. Ensure the battery terminals are firmly connected prior to disconnecting the alternator.
b. Disconnect the battery negative terminal prior to disconnecting the alternator.
Alternators operate at ______ wattage output at ______ rpm. a. Greater; higher b. Greater; lower c. Reduced; higher d. Reduced; lower
b. Greater; lower
The ______ is better to use than a(n) ______ because it does not require any battery cables to be removed; it can be quickly clamped around the main starter cable. a. Standard ammeter; inductive ammeter b. Inductive ammeter; standard ammeter c. Inductive ammeter, DVOM d. None of the above
b. Inductive ammeter; standard ammeter
Tech A says that the alternator converts electrical energy into mechanical energy. Tech B says that the alternator converts mechanical energy into electrical energy. Who is correct? a. Tech A b. Tech B c. Both Techs A and B d. Neither Tech A nor B
b. Tech B
Technician A says that the starter converts mechanical energy to electrical energy. Technician B says that the starter converts electrical energy to mechanical energy. Who is correct? a. Technician A b. Technician B c. Both Technicians A & B d. Neither Technician A nor B
b. Technician B
The primary coil typically has _____ turns of light-gauge wire while the secondary has approximately 30,000 to 60,000 turns of very fine wire. a. 50 to 100 b. 100 to 200 c. 200 to 300 d. 400 to 500
c. 200 to 300
The alternator produces _____ internally, which is rectified to ______ and used to charge the battery and power accessories. a. DC voltage; AC voltage b. DC voltage; DC amperage c. AC voltage; DC voltage d. AC voltage; AC amperage
c. AC voltage; DC voltage
The alternator housings are typically constructed from ______, with vents within the frames to provide for a large amount of airflow to assist in dissipating heat. a. Cast iron b. Steel c. Aluminum d. Copper
c. Aluminum
What are the two main components of an electric motor? a. The field and brushes b. The housing and bushings c. Armature and the field d. The armature and pulley
c. Armature and the field
Where should you place the voltmeter leads when measuring the voltage drop on the ground side of the alternator? a. Black lead on the alternator output terminal, and red lead on the negative battery terminal. b. Black lead on the case of the alternator, and red lead on the positive battery terminal. c. Black lead on the case of the alternator and red lead on the negative battery terminal. d. Black lead on the negative battery terminal, and red lead on the positive battery terminal.
c. Black lead on the case of the alternator and red lead on the negative battery terminal.
A voltage regulator ________, thus controlling the strength of the magnetic field of the rotating magnet. a. Monitors battery voltage b. Varies current flow through the rotor field circuit c. Both A and B d. Neither A nor B
c. Both A and B
Alternators are used almost exclusively in modern automobiles due to their superior operating characteristics, including ________. a. Greater wattage output at lower rpm b. Smaller physical size and weight for a given output c. Greater reliability and longer service life d. All of the above
d. All of the above
_______ is/are fundamental to the automobile. a. A 12-volt storage battery b. An engine starting system c. A charging system d. All of the above
d. All of the above
The output of the pull-in winding is connected to the main starter terminal leading to the _______. a. Field windings b. Armature windings c. Neutral safety switch d. Both A and B
d. Both A and B
The stationary winding assembly is called the: a. slip ring. b. rotor. c. armature. d. stator.
d. stator.
