1
What is the moving component in an alternator?
the rotor
When an alternator is full fielded, which of the following components is bypassed?
the voltage regulator
When the term sensing voltage is referred to in alternator operation, which of the following best describes it?
battery voltage
What is the function of slip rings in an alternator?
to conduct current to the rotor
What component turns the alternator?
drive belt
What is used to control the current output of an alternator?
a voltage regulator
What part of the alternator produces the magnetic field ?
rotor
When a carbon pile is used to load the electrical system to test the charging circuit, how much load should be applied?
enough to drop system voltage to 12.7 volts
What type of diode bridge arrangement is more common in alternators used in heavy truck applications?
delta
A typical rotor contains:
seven north poles and seven south poles
How many windings are in a typical alternator?
3
Does an alternator produce AC or DC power?
AC
Why do the brushes in an alternator last much longer than brushes in a DC generator?
they conduct much less current
What component is used to switch field current on and off in an alternator?
a voltage regulator
How many diodes is in reverse bias, what is happening to current flow through it?
current is blocked
What is used in an alternator to rectify AC to DC?
diodes
What instrument should be used to measure alternator current output?
an ammeter
How much horsepower is required to drive a 100 amp alternator?
6-7 horsepower
What is used to perform switching functions in an electronic voltage regulator?
transistors
Cold batteries have a _________ resistance to charging.
higher
__ terminal receives voltage from ignition switch through charge lamp and “wakes up” voltage regulator
"I"
___ Terminal – receives power from the battery, provides power to the field and acts as a sensing circuit
“A”
___ Terminal – sends voltage to the battery from the generator
“B”
___ Terminal – receives AC voltage from the stator in order to control charge lamp
“S”
Voltage drop reading should not exceed _.__ volts?
0.40