Unit 3

Question 1

What do dot-dash lines mean on an interconnection diagram?

Answer 1

Outline of the panel sections

Question 2

What diagram should include all wire numbers, device code numbers, and area designations?

Answer 2

An extraction

Question 3

Which diagram is the most important of all diagrams because it is your guide through the connection diagram?

Answer 3

Schematic

Question 4

Typical electrical system engines use what voltage batteries to provide power to start and operate the engine?

Answer 4

12 or 24

Question 5

Which electrical system component performs two functions—one mechanical and one electrical?

Answer 5

Started solenoid

Question 6

Which component is the stationary conductor on the battery-charging alternator?

Answer 6

Stator

Question 7

How many diodes are used in the rectifier of a battery-charging alternator:

Answer 7

6

Question 8

What causes the crank relay coil to de-energize causing the starter solenoid to de-energize?

Answer 8

Speed switch opening

Question 9

Why do you make sure to reconnect the electrical leads to the appropriate lugs to match the polarity of the battery?

Answer 9

To avoid damage to the battery and other electrical components

Question 10

If you adjust a battery-charging alternator too high, the

Answer 10

battery will be damaged

Question 11

If you adjust a battery charging alternator too low, the

Answer 11

battery will not reach full charge

Question 12

What is the specific gravity of a fully charged lead-acid cell at 80 degrees?

Answer 12

1280

Question 13

In addition to elbow length rubber gloves and a rubber apron, what other safety equipment must you wear when working on batteries?

Answer 13

Face shield

Question 14

The specific gravity of battery electrolyte changes

Answer 14

.004 for every 10 degrees in temperature change

Question 15

Visually check the electrolyte level in each cell of a battery. If the level is low, fill the cell to the proper level using

Answer 15

distilled water

Question 16

What is the first step you take when replacing a battery?

Answer 16

Disconnect the negative terminal

Question 17

When replacing a battery, which step helps prevent corrosion?

Answer 17

Ensure battery terminals are seated and tightened

Question 18

What is the first step in the troubleshooting process?

Answer 18

Perform an operational check

Question 19

Which electrical malfunction do positive and negative conductors making direct contact cause?

Answer 19

A direct short

Question 20

Which electrical malfunction is caused by the contacts of a switch or relay being welded closed?

Answer 20

A shorted control

Question 21

Which electrical malfunction has the same symptoms as a direct short?

Answer 21

Ground

Question 22

What is the primary reason or engines failing to start?

Answer 22

Low battery voltage

Question 23

One indication that a direct current (DC) charging system is not working correctly is the battery-charging

Answer 23

ammeter is reading in a discharged state

Question 24

Where does a magnet have the greatest amount of magnetism?

Answer 24

At each end of the magnet

Question 25

What is the small amount of magnetism that remains in an item after removing the magnetic field?

Answer 25

Residual