Technician A says a noisy alternator could be caused by a bad diode. Technician B says a noisy alternator could be cause by a worn bearing. Who is right?
The alternator on a vehicle has failed prematurely. Basic checks of vehicle wiring and batteries have revealed no problems, but the driver has several times left the lights on overnight. Each time, the vehicle was jump-started and sent back out. Technician B says the alternator was probably defective and replacing it should solve the problem. Technician B says the problem is that the vehicle''s batteries should have been slow-charged before sending the truck out on the road. Who is right?
When testing between the two alternator rotor slip rings, your ohmeter reads "0" is this acceptable?
A loose alternator belt may cause:
In an alternator, the field winding is part of the:
In an alternator, the current producing windings are:
In an alternator, the AC output is changed to DC by the:
Alternator rotor windings should be checked for opens, shorts, and:
Alternator brushes will carry the full:
The magnetic field in an alternator is created in the:
The output current of an alternator is created in the:
An alternator rotor is constructed so that;
Rectifier diodes on most equipment installations are mounted in the:
The magnetic polarity of an alternator''s interlaced pole pieces is determined by:
An alternator stator with three windings usually has a rectifier with:
The alternator field excitation circuit may be energized by:
Most alternators cannot start operation independently because:
Voltage output of the alternator is controlled by regulating the:
The first step in diagnosing a charging system problem is to:
A single diode in a stator winding will produce:
Alternator maximum output is directly related to:
Charging circuit indicator lamps are installed so that they will not light when
Regulators, in alternators and generators are charging system devices that can control:
When checking out a low charge voltage complaint, a technician performs a visual examination, then turns the key switch on and finds that there is magnetism at the alternator pulley, the problem could be with the:
Overcharging, a high voltage produced by an alternator, is often caused by a faulty
Brushes worn to _____________ their original length should be replaced.
Which type of winding will produce more current flow?
Two technicians are discussing an alternator with zero output. Technician A says the alternator field circuit may have an open circuit. Technician B says the fuse may be burned from the ignition to the alternator. Who is right?
An alternator with a 90-ampere rating produces 45 amps during an output test. A V-belt drives the alternator and the belt is at the specified tension. Technician A says the V-belt may be worn and bottomed in the pulley causing it to slip. Technician B says the alternator pulley may be misaligned with the cranskshaft pulley. Who is right?
Technician A says that undercharging could be caused by a loose drive belt. Technician B says that undercharging could be caused by undersized wiring between the alternator and the battery. Who is right?
Two technicians are discussing a truck charging system output test. Technician A says all vehicle lights and accessories should be turned off during the AVR load test to accurately measure maximum alternator output. Technician B says the normal charging system voltage should be limited to 14? volts maximum for a 12V system. Who is right?
For a charging circuit volt drop, the voltmeter connections should be at:
The ground side of a truck''s charging circuit is being tested for voltage drop. Technician A says to place the voltmeter leads on the voltage regulator ground terminal and the vehicle''s battery. Technician B says to place the voltmeter leads on the alternator casing and the truck''s battery ground side. Who is right?
Which of these is part of an alternator?
An alternator is being rebuilt. Technician A says that the rotor must always be replaced when rebuilding. Technician B says that the brushes and slip rings conduct current to the field coil. Who is right?
Technician A says that the battery cables only need to be serviced when the starting or charging system is experiencing problems. Technician B says that battery corrosion only forms on the terminals during cold weather. Who is right?
The picture below is an example of
In the charging system shown, the meter readings will show:
Only when full fielding the alternator does the output meet the alternator rating, what may be the problem?
To polarize a B type generator
An over-the-road truck that has experienced excellent electrical system performance is switched into city delivery service. Idling restrictions require that the truck be shut off and restarted at every stop. Now, the vehicle has a chronic problem with undercharged batteries and failure to start. Technician A says the truck needs a larger alternator and batteries. Technician B says the voltage regular should be adjusted to provide a faster charging rate. Who is right?
Same situation as the previous question, but the truck is put back into over-the-road service for a couple of weeks. Technician A says that all that is necessary is to check the batteries frequently for proper electrolyte level and replenish as necessary. Technician B says to readjust the voltage regulator back to the original setting. Who is right?
The generator rectifies its current from AC to DC by the use of
The "load neutral" point is chosen for brush location in a generator because
The pole shoes in a generator will usually retain a certain amount of residual magnetism
The component used to disconnect the generator from the battery when the engine is stopped is known as the:
A badly burned commulator bar would be an indication that an armature has a (n)
Technician A says that by grounding the field circuit on an A type alternator circuit, it will cause the alternator to provide maximum output at that RPM. Technician B says that a shorted rotor coil is a possible cause of low alternator output. Who is correct?
Technician A says that you should polarize all replacement generators.Technician B says that you should polarize all replacement alternators. Who is correct?
To full field test an "A" type alternator circuit you must:
Technician A says that before MIG welding on an alternator-equipped truck, disconnect the battery ground. Technician B says that one bungee strap hold down is sufficient to hold an 1100 series battery. Who is right?
The purpose for the resistor that is mounted in parallel with the charging circuit indicator light is to:
Which of these is part of a truck''s charging system?
The charging indicator light on a truch is illuminated when the ignition switch is off. Technician A says this can be caused by a bad rectifier bridge. Technician B says that this can be caused by a short between generator #1 and #2 terminals on a Delco Sl alternator. Who is right?
On a truck with a dash charging indicator light that does not come on when the ignition switch is tuned on but the truck has an undercharged battery. Technician A says this can be caused by a blown fuse between the indicator lamp and ignition switch. Technician B says this could be caused by a worn pulley and a glazed fan belt. Who is right?
Two technicians are discussing a dash-mounted voltmeter. Technician A says that often the dash voltmeter is not accurate and will often read diffenently from an accurate voltmeter across the battery terminals. Technician B says that unwanted resistance in the charging circuit will affect the accuracy of the dash voltmeter''s readings. Who is right?
A stator''s wires are grouped into threee separate bundles also known as:
Technician A says that when performing an alternator output test, a voltmeter should be connected in series with the positive on the alternator output terminal and the negative on the battery ground cable. Technician B says that a carbon pile is the best and the most accurate thing to use when performing an alternator output test. Who is right?
An alternator output test is being performed. Technician A uses only a voltmeter connected across the battery positive terminal and negative terminal while the engine is running. Technician B says a carbon pile is not needed since the engine is already running. Who is right?
An alternator''s construction is being discussed. Technician A says that a typical electronic voltage regulator consists of transistors, diodes, zener diodes, capacitors and resistors to control output voltage. Technician B says alternators with internal voltage regulators use full battery current and voltage to power the field circuit while the engine is running. Who is right?
Alternator noise complaints are being discussed. Technician A says a loose belt may make a squelling noise under load. Technnician B says a whining noise can be caused by a shorted diode. Who is right?
What is the LEAST likely result of a full-fielded alternator?
The difference between an ordinary diode and a zener diode is:
While reassembling an alternator during a rebuild, Technician A always replaces the drive pulley. Technician B says that it is always a good idea to replace the field brushes when performing an alternator rebuild. Who is right?
A maintenence-free battery is low on electrolyte and the built-in hydrometer indicates clear or light yellow. Technician A says a faulty voltage regulator may have caused this problem. Technician B says a loose alternator belt may have caused this problem. Who is right?
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