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Electrical, Failure & CVIP > Electrical Fundamentals - A > Flashcards

Electrical Fundamentals - A Flashcards

1
Q

Type 1 circuit breakers

A 
Cycle off (open) when rating is exceeded, automatically reset when over load is removed from the system.
Are a cycling breaker
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2
Q

Type 2 circuit breakers

A

Come with a heat-producing resistor and bi-metallic strip. The resistor heats up when exposed to high current and pushes the strip away opening circuit.
Are a non-cycling breaker

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3
Q

Type 3 circuit breakers

A

Are push button manual reset

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4
Q

Fusible link

A

Stretch of wire 4 awg smaller then the wire in the circuit where it is placed

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5
Q

Headlights must have what power source and breaker?

A

Low beams must be connected to the constant power terminal. Both high and low beam systems must use type 1 breakers

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6
Q

The daytime running light module sends what voltages out to the lights.

A

2-3 volts less then normal (9-10 at light)

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7
Q

Night running lights must be connected into what circuit?

A

Can only run when high beams are on

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8
Q

Clearance lights

A

Indicate the outer dimensions

Connected to constant power terminal

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9
Q

Marker Lights

A

Indicate the upper regions

Connected to constant power terminal

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10
Q

Tail Lights

A

Indicate the rear dimensions, must be red

Connected to the constant power terminal

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11
Q

Switch poles and throws

A

Poles - the number of power terminals in

Throws - the number of output options

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12
Q

Pulse width modulation

A

Signal is turned on and off to control the intensity

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13
Q

Turn signal flasher

A

Either a electromechanical device or a solid state electronic device. The electromechanical flasher will not typically work with the low current draw of LED’s

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14
Q

Solenoids

A

A electromagnetic device that changes electrical energy into linear energy

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15
Q

What are the 3 categories of solenoids?

A

Discrete
Proportional
Latching

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16
Q

Discrete Solenoids

A

A return spring holds the plunger in the relaxed position. Has 2 positions: fully retracted or fully extended

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17
Q

Proportional Solenoid

A

Provides an infinite number of plunger positions. Movement directly proportional to the voltage applied. Plunger works against a spring. Coil is designed to operate continuously; windings are made of many turns of fine-diameter copper conductors

18
Q

Latching solenoid

A

Is a discrete solenoid that remains fixed at the end of its travel when the coil is de-energized. Not internally grounded and are controlled by a current-reversing circuit.

19
Q

Self-induction

A

The process of producing a voltage in the coil circuit when current flow stops. Caused by the collapse of the magnetic field

20
Q

What are the 2 way to prevent switch arcing from self-induction

A

Install a high value resistor in parallel with the solenoid coil.
Clamping diode is installed

21
Q

Clamping diode

A

Self-discharge diode. Acts as a one way check valve, the solenoid coil can be energized normally, but when it produces a self-induced voltage, the current is not allowed to flow and the self-induced voltage will not rise

22
Q

DC motors use what to create motion?

A

Electricity and magnetism

23
Q

Counter electromotive force (CEMF)

A

The voltage produced by a operating dc motor. Is increased as the speed of the motor is increased, this allows less EMF to flow through. This balance is what governs the speed of the motor

24
Q

Slow dc motor speed

A

Generates high levels of torque. The low levels of CEMF mean that high EMF current which generates high levels of heat

25
Q

What prevents a dc motors generating effect from transmitting voltage

A

Blocking diode

26
Q

Permanent magnet DC motors

A

Uses strong magnets to create stationary magnetic field. CEMF is the only factor that limits the motors speed. Used for high-load applications as they are low maintenance, reliable and provide constant torque

27
Q

Permanent magnet motors are reversed how?

A

Changing the polarity of the input of the motor. ILM does this with a double pole double throw switch

28
Q

Field wound dc motors

A

Field coils wrap around the pole shoes, which are wound in opposite directions. This creates a magnetic field in the housing

29
Q

Parallel wound dc motor

A

Also called shunt motor. Field coils and armature are wound in parallel. This allows the field coils to maintain a even mag. field strength as the speed of the armature fluctuates. It also prevents CEMF from flowing through field

30
Q

Field wound motor reversal

A

Requires connection changes inside of the motor. Must add extra switches and make internal motor wiring connections to change the current flow in either armature of field.

31
Q

What are the 3 ways to control speed in a electric motor

A

Variable electrical resistance
Multiple shunt windings
Pulse width modulation

32
Q

Variable resistance speed control

A

A resistor reduces the amount of voltage that is delivered to the motor. have a thermal fuse a current protection

33
Q

Multiple Shunt windings

A

1 set of coils are small, 1 set of coils are large. Slow uses small coils, med. use large coils, high uses both coils to generate field strength

34
Q

Pulse width modulation

A

Solid state module connected in series turns electrical current on and off. amount of time on (%) is the duty cycle. the longer the on time the faster the motor spins

35
Q

What are the 3 ways to dis-engage the cruise control on a truck.

A

Step on brake pedal
Step on clutch/ auto trans. into neutral
Dash switch

36
Q

Battery isolation switches

A

Disconnect main ground just before batteries

37
Q

When by-passing the battery isolation switch what must be installed?

A

Fuses on both the positive and negative leads

38
Q

What can you install to reduce or eliminate interference and static noise?

A

A series coil (filter choke) or a parallel-connected capacitor the the units power lead

39
Q

If an entertainment or communication device requires a cable to transmit processed info, it must have?

A

A proper shield on the cable

40
Q

What are the 3 most common truck position sensing systems?

A

Collision warning system (CWS)
Adaptive Cruise Control (ACC)
Collision mitigating system (CMS)

41
Q

What sensor does a collision avoidance system use to detect that the vehicle is traveling around a curve?

A

Gyro sensor

42
Q

Park contacts

A

A set of switch contacts located inside the motor, they supply power to motor after switch has been turned off until motor returns to park position.

Electrical, Failure & CVIP (5 decks)

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