Off road electrical circuit fundamentals Part A

Question 1

Equipment lighting circuits are used to provide illuminations. List four purposes served by these lighting circuits.

Answer 1

a. Vision during night operation and poor visability conditions.
b. Machine and operator safety.
c. operator convienence
d. unit appearance.

Question 2

There are three types of circuit breakers discussed in this module: type I, type II, and type III. Explain why type II circuit breakers come equipped with at heat producing resistor.

Answer 2

It holds the circuit breaker in the open position while the breaker rating is exceeded.

Question 3

The intensity of the instrument panel lights can be controlled by the use of:

a. series connected rheostat.
b. pulse width modulated signal.
c. SPST switch.
d. both a and b.

Answer 3

d. both a and b.

Question 4

The turn signal light circuit has a turn signal flasher connected in its circuit. How is the turn signal flasher connected in this circuit?

a. series with the turn signal lamp connection.
b. parallel connection
c. series-parallel connection
d. open connection

Answer 4

a. series with the turn signal lamp connection

Question 5

A unit equipped with LED turn signal and brake lamps must have a solid stat electronic flasher to flash properly. Why does an electromechanical signal light flasher not flash LED turn signal lamps properly?

Answer 5

The LED turn signal lamp doesn’t draw enough current.

Question 6

___________ systems are comprised of two distinct components: a satellite tracking component and a communication component.

Answer 6

Equipment tracking

Question 7

____________ are safety devices that are usually installed on the highest point of the equipment so that the machine can be visible in all directions.

Answer 7

Warning beacons.

Question 8

How many amps will a 12 volt electric blower motor draw if it is rated at 100 watts?

a. 1200 amps
b. 8 amps
c. .12 amps
d. 100 amps

Answer 8

b. 8 amps.

Question 9

What is the name of the switch that will prevent the accidental slow discharge of the battery group when the equipment is parked and not operating?

a. key switch.
b. disconnect switch.
c. safety power switch.
d. high power switch.

Answer 9

b. disconnect switch.

Question 10

From which main electrical circuit does the flood/ working lamp circuit recieve electrical power?

a. key switch controlled circuit
b. constant power circuit.
c. safety power controlled circuit
d. high power controlled circuit

Answer 10

a. key switch controlled circuit.

Question 11

If the fibre optic instrument panel illumination system fails, what is most likely the the malfunctioning component?

Answer 11

The light source.

Question 12

If the fiber optic instrument panel illumination system fails, what is the most likely malfunctioning component?

Answer 12

The light source

Question 13

What other unit electrical accessory device can be controlled by the same switching system that controls the machine’s backup lamp circuit?

Answer 13

The same system can also control the backup alarm beeper.

Question 14

Entertainment and communication device inference is caused by electromagnetic energy and is know as _____________ or ________.

Answer 14

interference or static noise.

Question 15

Anti theft systems are unit security systems that can be classified as either ________ systems or ___________ systems, or a combination of both.

Answer 15

alarm, theft deterrent

Question 16

What would result in a circuit when energized, if a techician added two 80 watt light bulbs hooked up in parallel into an existing circuit that had two 55 watt and two 80 watt lights connected in parallel, and the 24 volt circuit was protected by a 20 amp fuse?

a. the fuse would blow.
b. the wiring would get hot and catch fire.
c. the existing lights would be dimmer.
d. the lights would work normally.

Answer 16

d. the lights would work normally.