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HET3 > 302Da: Off-Road Electrical Circuit Fundamentals > Flashcards

302Da: Off-Road Electrical Circuit Fundamentals Flashcards

1
Q

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

A
  • Vision during night operation and poor visibility conditions
  • Machine and operator safety
  • Operator convenience
  • Unit appearance

302Da Pg. 3

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2
Q

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

Disconnect switch

302Da Pg. 5

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3
Q

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 a heat-producing resistor.

A

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

302Da Pg. 6

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4
Q

From which main electrical circuit does the flood/working lamps receive electrical power?

a) Key switch controlled circuit
b) Constant power controlled circuit
c) Safety power controlled circuit
d) High power controlled power

A

b) Constant power controlled circuit

302Da Pg. 9

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5
Q

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

a) series connected rheostat
b) pulse width modulated signal
c) SPST switch
d) a and b are both correct

A

D) a and b are both correct

302Da Pg. 13

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6
Q

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

A

Bulb.
Then confirm the fiber optic lead is connected to the bulb.
Then check for cut or worn sheath

302Da Pg. 13

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7
Q

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 with the lamp
c) Series-Parallel
d) Open connection

A

a) Series with the turn signal lamp

302Da Pg. 15

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8
Q

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

A

The LED turn signal lamp does not draw enough current

302Da Pg. 16

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9
Q

Entertainment and communication device inference is caused by electromagnetic energy and is known as:

A

Inference or static noise

302Da Pg. 27

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10
Q

What is often installed accross an alternator’s output lead and ground to provide filtering and reduce interferance in the equipment’s electronic systems?

A

Capacitor
Known as a series coil or choke filter

302Da Pg. 27

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11
Q

Anti-theft systems are unit security systems that can be classed as either_____systems or _____systems, or a
combination of both of these systems.

A

Alarm systems or theft deterrent systems

302Da Pg. 35

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12
Q

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

A

Warning beacons

302Da Pg. 17

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13
Q

What would result in a circuit when energized, if a technician added two 80 watt lights hooked 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 lights would work normally

Four 80W & two 55W lights in parallel = 17.9Amps

302Da

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14
Q

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

A

8.3 amps

100W/12V = 8.33A

302Da

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15
Q

Is a disconnect switch wired in series or parallel with the battery group?

A

Series

302Da Pg. 5

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16
Q

Name the two ways a disconnect switch maybe operated.

A

Manually or electrically

302Da Pg. 5

17
Q

The main circuit protection device is connected in parallel to the machine fuse/circuit breaker box. (T/F)

A

False

302Da Pg. 5

18
Q

Speedometers can be direct-reading or indirect-reading type. How is the direct-reading type achieved and how is an indirect-reading type achieved?

A

Direct Reading: Cable driven from transmission output shaft

Indirect Reading: Speed sensor on transmission output shaft. Output is an A/C signal

302Da Pg. 41

19
Q

Some charging system warning lamps contain a resistor connected in series with the lamp. (T/F)

A

False
Resistor is connected in parallel.

302Da Pg. 37

20
Q

What is an air core gauge?

A

An inexpensive gauge that has coils wound around a ferrite core and acts as a simple motor with a permanent magnet rotor.

302Da Pg. 38

21
Q

What kind of current is produced by a speed sensor?

A

A/C current

302Da Pg. 39

22
Q

Name two types of voltage pulse generators that are a small permanent magnet style and typically used as speed sensors.

A
  • Rotating permanent magnetic generator
  • Reluctance voltage generator

302Da Pg. 39

23
Q

What is the purpose of the hour meter?

A

Provides a record of total running time

302Da Pg. 40

24
Q

What is EEPROM?

A

Electronically erasable programmable read only memory

Non-volatile memory

302Da Pg. 40

25
Q

What precaution should you consider if you change a unit’s rear drive axle ratios or tires?

A

Reprogram or adjust the speedometer

302Da Pg. 41

26
Q

Where is the fuel gauge sending unit located?

A

In the fuel tank. It includes a float and a variable resistor.

302Da Pg. 42

27
Q

The panel mounted fuel gauge processes the ____________ __________of the fuel sender signal and converts it to a gauge pointer position.

A

Resistance value

302Da Pg. 42

28
Q

Explain the main quality of an NTC thermistor. (Negative temperature coefficient)

A

As temperature increases, resistance decreases
As temperature decreases, resistance increases

302Da Pg. 43

29
Q

When a rheostat is used, how are panel lamps dimmed?

A

By adding resistance in series with panel lamps, less voltage remains in the circuit for the panel lamps.

30
Q

What is duty cycle

A

On time to total time

31
Q

LED stop lights will provide operators who are behind 10 meters of addition stopping distance, when the equipment is moving at 100 kilometres per hour. (T/F)

A

True

302Da Pg. 20

32
Q

Units equipped with LED turn signal and brake lamps must have what type of flasher to operate properly?

A

A solid state electronic flasher

302Da Pg. 16

33
Q

What type of circuit breaker is depicted in the diagram?

A

Type I Cycling

Used where current flow must be restored quickly
Automatically resets

302Da Pg. 6

34
Q

What type of circuit breaker is depicted in the diagram?

A

Type II Non-Cycling

Built-in heat-producing resistor to hold the breaker open while current rating is exceeded.

302Da Pg. 6

35
Q

What type of circuit breaker is depicted in the diagram?

A

Type III Non-Cycling

Must be manually reset by pushing button

302Da Pg. 6

HET3 (36 decks)

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