190302dA

Question 1

What does a battery disconnect switch prevent?

Answer 1

accidental slow discharge of battery group when unit is parked

Question 2

How can the battery disconnect switch be connected in?

Answer 2

in series in either the positive side or negative side

Question 3

Purpose of circuit protection devices?

Answer 3

protect machines electrical circuits from large current flows

Question 4

How does a type 1 circuit breaker react?

Answer 4

opens and closes when a bimetal strip heats and cools

Question 5

how does a type 2 circuit breaker react?

Answer 5

has a heat producing resistor, must cool down before it will restore

Question 6

how does a type 3 circuit breaker react?

Answer 6

has a manual reset button. must cool down completely before use.

Question 7

formula for calculating circuit load?

Answer 7

P= I x E (power = amps x volts)

Question 8

What does the headlamp system provide?

Answer 8

illumination at night and in poor weather

Question 9

Are the flood/working lamps battery hot or key hot?

Answer 9

key hot

Question 10

What does installing flood/working lamps depend on to ensure proper installation?

Answer 10

material
area
length
temperature

Question 11

What is a pole in reference to?

Answer 11

of paths

Question 12

What is a throw in reference to?

Answer 12

of positions

Question 13

How can the intensity of panel lamps be controlled?

Answer 13

with a series connected rheostat

Question 14

What flasher must be used with LED?

Answer 14

solid state flasher

Question 15

why can’t you use an electromechanical flasher with LED lights?

Answer 15

LED doesn’t produce enough current flow for that type of flasher

Question 16

what are the 3 types of flashers?

Answer 16

electronic, solid state, electromechanical

Question 17

If the eco is the control device for the backup light and warning beeper, where should the relay be grounded?

Answer 17

through the ecu

Question 18

what two signals can control the backup lamp circuit?

Answer 18

unit transmission switch or eco

Question 19

When the cab door is closed, what position is the door switch?

Answer 19

open position

Question 20

Benefits of using LED lights?

Answer 20

provides operators 10m of stopping distance

Question 21

How do DC motors operate?

Answer 21

use electricity and magnetism to produce rotary mechanical motion

Question 22

does a PM motor have electrical field coils?

Answer 22

no

Question 23

what is the only factor limiting a PM motors armature speed?

Answer 23

counter-electromotive forces generated in the armature

Question 24

Since the speed of a pm motor is constant, what can be used to slow the output?

Answer 24

a reduction gearbox

Question 25

Why would you install fuses in both positive and negative leads of operator entertainment and communication circuits?

Answer 25

to prevent damaging the component and wiring if someone tried to crank the unit with the battery disconnect switch off

Question 26

what is interference caused by?

Answer 26

electromagnetic energy aka static

Question 27

how do you get rid of interference?

Answer 27

series coil or parallel connected capacitor

Question 28

what are equipment tracking systems comprised of?

Answer 28

a satellite tracking component and a communication component

Question 29

how does an air core gauge operate?

Answer 29

using coils winding around a ferrite core

Question 30

what does a tachometer read?

Answer 30

displays unit engine speed in rpm

Question 31

how is fuel level measured?

Answer 31

uses a sending unit in the fuel tank, includes a float and variable resistor

Question 32

what is an anti-slosh module?

Answer 32

electronic filter that minimizes gauge pointer fluctuation when fuel sloshes around

Question 33

why would a fuel level reading be inaccurate?

Answer 33

if fuel gauge sending unit does not have a proper electrical ground

Question 34

characteristic of a negative temperature coefficient?

Answer 34

resistance low when hot
resistance high when cold

Question 35

characteristic of a positive temperature coefficient?

Answer 35

resistance low when cold
resistance high when hot

Question 36

the intensity of the instrument panel lamps can be controlled by the use

1. series connected rheostat
2. pulse width modulated signal
3. spst switch
4. 1 and 2 are correct

Answer 36

4. 1 and 2 are correct