Chapter 8 (assessment) Flashcards
Charging Systems Assessment
What is the maximum acceptable AC leakage specification in a typical truck charging system?
0.3 V-AC
Technician A says that most current trucks are protected from reverse polarity connections to the electrical system. Technician B says that by connecting a truck electrical system in reverse polarity can destroy an alternator diode bridge and other solid state devices. Who is correct?
Technician B only
Technician A says that a 100 amp alternator can draw as much as 7 horsepower from the engine. Technician B says that an alternator is switched in and out of its effective cycle by the voltage regulator. Who is correct?
Both A and B
Which of the following alternator failures could result in undercharging?
a) opens stator winding
b) shorted stator winding
c) grounded rectifier
d) all of the above
all of the above
How is field current routed through an alternator?
through slip rings and the rotor
Which of the following describes the role of a rectifier in an alternator?
AC is rectified to DC
Which of the following statements about how electrical current flow is induced in an alternator is correct?
rotating magnetic field induces a voltage into stationary windings
Which stator windings are connected in series and have a neutral junction?
wye-wound stator
When a diode is used in an AC circuit for half-wave rectification, which of the following should be true?
it becomes forward bias to conduct the positive half of the AC sine wave
Technician A says that the Delco-Remy Intelli-check instrument can pin-point difficult to diagnose, charging circuit problems. Technician B says that an Intelli-check test procedure produces one of 5 status outcomes after testing. Who is correct?
Technician B only
Which windings in an alternator are connected to the diodes in the rectifier?
stator windings
Technician A says that a Delco/Remy 33/34 SI alternator can only be driven clockwise (CW). Technician B says that to restore residual magnetism in an alternator with an R or I terminal, the ground terminal should be momentarily connected to battery ground. Who is correct?
Technician B only
Which of the following conditions will shorten the life of batteries?
a) undercharging
b) overcharging
c) deep-cycling
d) all of the above
all of the above
What is the function of the diode trio in an internally regulated truck alternator?
rectifies the current produced by the field coil
What component in an alternator rotates?
rotor
Technician A says that to perform a maximum output test on a typical heavy-duty truck charging circuit, the engine should be run at 1500 rpm. Technician B says that alternator rpm is typically at least three times engine rpm. Who is correct?
Both A and B
Which of the following statements about the diagnostic practice of full-fielding an alternator is true?
a) procedures for A- and B- type circuit regulated alternators are different
b) some internally regulated alternators can be full-fielded with a paper clip
c) some internally regulated charging systems cannot be full-fielded
d) all of the above
all of the above
Which of the following sets of voltage range specifications indicates that a typical truck voltage regulator is functioning properly?
13.5-14.1 volts
Which of the following best explains how an alternator is driven by truck engine at a higher speed than engine rpm?
drive pulley to alternator pulley ratio
Technician A says that to perform an AC leakage test, a DMM should be set to auto-range AC with one test lead placed on the alternator insulated terminal, and the other on chassis ground. Technician B says that when performing an AC leakage test, the engine should be run at 1500 rpm. Who is correct?
Both A and B
When an alternator is full-fielded, which of the following temporarily ceases to function?
voltage regulator
What amperage ratings can be produced by a Delco/Remy 33/34 SI alternator?
150 amps or more
Technician A says that a Delco/Remy 55 SI alternator rated at 420 amps is often used in motor coach applications. Technician B says that a Delcotron 33/34 SI can be rated as high as 300 amps. Who is correct?
Both A and B
How many diodes are used in a typical 3-phase, full-rectification truck alternator?
6
When testing a Delcotron 33/34 SI alternator at an ambient temperature of 80 degrees Fahrenheit, what would be a within specification field current draw?
5.5 to 9 amps
