302E: Off-Road Electrical Circuit Service

Question 1

The type of wire connection made by twisting two wires together is called:

Answer 1

Western union splice

302E Pg. 12

Question 2

When using a DMM it is okay to pierce the insulation of the wiring. (T/F)

Answer 2

False

Question 3

When repairing wires with non-insulated butt connectors, what should be done after the connection is crimped?

Answer 3

Solder the splice and insulate it with shrink tubing

302E Pg. 13

Question 4

The most common fault that causes electrical circuit malfunction is:

Answer 4

Open fault

302E Pg. 7

Question 5

The troubleshooting process of finding specifically where the fault is located is called:

a) Calculating the electrical failure
b) Picking the electrical failure
c) Illuminating the electrical failure
d) Isolating the electrical failure

Answer 5

d) Isolating the electrical fault

302E Pg. 7

Question 6

What are the four steps to voltage drop testing?

Answer 6

• Check source voltage
• Check voltage drop across the load
• Check voltage drop from positive side of the load to positive battery
• Check negative side of the load to ground

302E Pg. 8

Question 7

All electrical schematics are drawn in a de-energized condition and all the electrical components are drawn in the:

Answer 7

Normal position

302E Pg. 2

Question 8

List the five components every machine’s electrical circuit must contain to be safe and functional.

Answer 8

• Voltage source
• Electrical conductors
• Control device
• Over current protection device
• Load

302E Pg. 3

Question 9

What is the correct expression for Ohm’s Law?
a) E = I x R
b) I = E/R
c) R = E/I
d) All of the above

Answer 9

All of the above

302E Pg. 4

Question 10

When you are troubleshooting a malfunctioning lighting circuit, you will use a process of eliminating circuit components that are not causing a problem in order to find the circuit component that is causing the problem. This process is called:

Answer 10

Isolating the electrical failure.

302E Pg. 7

Question 11

High electrical resistances in electrical circuits will cause voltage drops. Voltage drops that occur in equipment lighting systems will cause lamps to:

a) Illuminate normally
b) Illuminate dimly
c) Illuminate brighter than normal
d) Burn out

Answer 11

B) Illuminate dimly

302E Pg. 10

Question 12

Manufacturers develop and publish _____ _____ to guide you through troubleshooting procedures.

Answer 12

Flow charts/Troubleshooting trees

302E Pg. 19

Question 13

The electrical resistance values of all the components in the ________electrical circuit add together to form the total resistance value of the circuit.

Answer 13

Series

302E Pg. 4

Question 14

The current draw across each leg of a_________ electrical circuit add together to form the total current draw for the entire circuit.

Answer 14

Parallel

302E Pg. 5

Question 15

_______ or _______ warning devices signal the operator of a potential problem or hazardous condition concerning various machine operating conditions.

Answer 15

Audible or visual

302E Pg. 20

Question 16

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 16

voltage regulator

302E

Question 17

An information _______ _____ allows the unit’s electronic control modules to communicate with each other.

Answer 17

Data bus

302E Pg. 22

Question 18

On a set of wire strippers, what three colours correspond to the following wire gauge sizes?

20-18
16-14
12-10

Answer 18

20-18 Red
16-14 Blue
12-10 Yellow

302E Pg. 16