Unit 3 Flashcards
What do dot-dash lines mean on an interconnection diagram?
Outline of the panel sections
What diagram should include all wire numbers, device code numbers, and area designations?
An extraction
Which diagram is the most important of all diagrams because it is your guide through the connection diagram?
Schematic
Typical electrical system engines use what voltage batteries to provide power to start and operate the engine?
12 or 24
Which electrical system component performs two functions—one mechanical and one electrical?
Started solenoid
Which component is the stationary conductor on the battery-charging alternator?
Stator
How many diodes are used in the rectifier of a battery-charging alternator:
6
What causes the crank relay coil to de-energize causing the starter solenoid to de-energize?
Speed switch opening
Why do you make sure to reconnect the electrical leads to the appropriate lugs to match the polarity of the battery?
To avoid damage to the battery and other electrical components
If you adjust a battery-charging alternator too high, the
battery will be damaged
If you adjust a battery charging alternator too low, the
battery will not reach full charge
What is the specific gravity of a fully charged lead-acid cell at 80 degrees?
1280
In addition to elbow length rubber gloves and a rubber apron, what other safety equipment must you wear when working on batteries?
Face shield
The specific gravity of battery electrolyte changes
.004 for every 10 degrees in temperature change
Visually check the electrolyte level in each cell of a battery. If the level is low, fill the cell to the proper level using
distilled water
What is the first step you take when replacing a battery?
Disconnect the negative terminal
When replacing a battery, which step helps prevent corrosion?
Ensure battery terminals are seated and tightened
What is the first step in the troubleshooting process?
Perform an operational check
Which electrical malfunction do positive and negative conductors making direct contact cause?
A direct short
Which electrical malfunction is caused by the contacts of a switch or relay being welded closed?
A shorted control
Which electrical malfunction has the same symptoms as a direct short?
Ground
What is the primary reason or engines failing to start?
Low battery voltage
One indication that a direct current (DC) charging system is not working correctly is the battery-charging
ammeter is reading in a discharged state
Where does a magnet have the greatest amount of magnetism?
At each end of the magnet
What is the small amount of magnetism that remains in an item after removing the magnetic field?
Residual
