190302e

Question 1

A line drawing that uses symbols is called?

Answer 1

a schematic

Question 2

Schematics are not intended to identify the _____ of the component on the unit; they only show each components _____ to each of the other components

Answer 2

location, relation

Question 3

What state are all electrical schematics drawn in?

Answer 3

de-energized

Question 4

what position are electrical components in on a schematic?

Answer 4

normal

Question 5

What are the components each electrical circuit must have?

Answer 5

voltage source
electrical conductors
control device
overcurrent protection
load

Question 6

what circuit is most common in off road equipment electrical circuits?

Answer 6

series

Question 7

how do you find total resistance in a series circuit?

Answer 7

add all of the resistances together

Question 8

how do you find the voltage supplied in a series circuit?

Answer 8

add all of the voltage drops from each component

Question 9

What is ohms law equation?

Answer 9

E = I x R

Question 10

will total resistance be more or less than an individual resistance in a parallel circuit?

Answer 10

less than

Question 11

how is voltage drop divided in a parallel circuit?

Answer 11

each branch will see the same voltage drop across it

Question 12

how do you find total current draw in a parallel circuit?

Answer 12

current across each branch add together for total current

Question 13

Most equipment lighting systems utilize what electrical circuit?

Answer 13

parallel

Question 14

What is the most common fault that causes electrical circuit malfunction?

Answer 14

open fault

Question 15

what is the second most common electrical circuit malfunction?

Answer 15

high resistance

Question 16

What troubleshooting process finds specifically where the fault is located?

Answer 16

isolating the electrical fault

Question 17

what method is used to quickly and accurately pinpoint the circuit fault location?

Answer 17

four-point test procedure

Question 18

What are the 4 point test procedure voltmeter spots?

Answer 18

1. check source voltage
2. check load voltage
3. check positive side between source and load
4. check negative side between source and load

Question 19

What is the best method to insulate damaged conductor wires?

Answer 19

using heat shrink tubing with an inner sealant

Question 20

What is a drawback of using a western union splice?

Answer 20

it requires extra wire

Question 21

Connector pins and sockets, when mated, have some resistance to current flow
T or F

Answer 21

True

Question 22

How can you prevent moisture from getting into electrical connectors?

Answer 22

o-rings, dielectric grease, silicon sealant

Question 23

What do troubleshooting trees ensure?

Answer 23

that a serviceable component is not replaced in error

Question 24

who created troubleshooting trees?

Answer 24

manufacturers

Question 25

What principle does an LCD screen use to operate?

Answer 25

uses the principle of polarized light to put images on a screen

Question 26

How does an LED emit light?

Answer 26

emits light when it’s connected in a forward biased circuit

Question 27

How does a vacuum fluorescent display emit light?

Answer 27

in a way similar to a cathode ray tube

Question 28

what are the 3 main info data bus configuration standards used in off-road equipment?

Answer 28

J1708, J1587, J1939

Question 29

What must you be aware of when servicing electronic panels?

Answer 29

wear a ground strap to prevent static electricity
disconnect main power before welding
use a high impedance DMM
do not rip on electrical harnesses

Question 30

why should you not leave any gauges face down for long periods of time?

Answer 30

because the fluid inside will leak out

Question 31

how will a gauge react if it has lost its fluid from leaking?

Answer 31

it will exhibit erratic dial movement

Question 32

high resistances will cause voltage drops. voltage drops that occur in equipment lighting systems will cause lamps to:

Answer 32

illuminate dimly

Question 33

_____ or _____ warning devices signal the operator of a potential problem or hazardous condition coercing various machine operating conditions

Answer 33

audible, visual

Question 34

Any change in unit electrical system voltage will affect the bi-metal gauge readings and cause them to be inaccurate. a small _______ ______ is used to maintain the system voltage and provide accurate gauge readings

Answer 34

voltage regulator

Question 35

what allows the units electronic control modules to communicate with each other?

Answer 35

an information data bus