Electrical Engineering Chapter 57 Flashcards
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Questions and Answers

Fuses and circuit breakers are rated in _____

Amps

There are many different types and configurations of switches, including all of the following EXCEPT:

  • Rock switches
  • Toggle switches
  • Friction switches (correct)
  • Push-button switches

A(n) __________ is an electrical device used to turn the current on and off in a circuit.

Switch

Fuses prevent circuit damage by:

<p>Stopping excessive current flow.</p> Signup and view all the answers

A(n) __________ is an example of a more complex switch, with three positions: center/off, down for one circuit on, and up for another circuit on.

<p>Turn signal switch</p> Signup and view all the answers

Who is correct: Technician A says relays are turned on and off by a small amount of current. Technician B says relays can be normally closed (NC) or normally open (NO).

<p>Both Technician A and Technician B (A)</p> Signup and view all the answers

By using a small current in the relay winding, the contacts in the relay control:

<p>A larger current.</p> Signup and view all the answers

What does 87 or 5 stand for in the automotive relay terminal labeling systems?

<p>NO fixed contact to the common</p> Signup and view all the answers

What does 30 or 3 stand for in the automotive relay terminal labeling systems?

<p>Common-movable switch contact</p> Signup and view all the answers

Who is correct: Technician A says that some relays have an internal switch that is normally open (NO). Technician B says that some relays have an internal switch that is normally closed (NC).

<p>Both Technician A and Technician B (D)</p> Signup and view all the answers

A __________ uses magnetic fields to create rotary movement.

<p>Motor</p> Signup and view all the answers

What two components generate motion in an electric motor?

<p>Armature and the field</p> Signup and view all the answers

Automotive wire is commonly a _____ copper core wrapped with _____ plastic insulation.

<p>Multi-stranded; seamless</p> Signup and view all the answers

The _______ uses a rating number; the larger the rating number, the ______ the wire and the lower its current-carrying capability.

<p>American wire gauge; smaller</p> Signup and view all the answers

If a wire is described as being metric size of 8.0, it has a cross-sectional area of:

<p>8.0 mm</p> Signup and view all the answers

Who is correct: Technician A says wire size is very important. Technician B says there are two scales used to measure wire size.

<p>Both Technician A and Technician B (B)</p> Signup and view all the answers

Who is correct: Technician A says a modern automobile has more than 1 mile of wiring. Technician B says there could be more than 1,000 individual wires.

<p>Both Technician A and Technician B (D)</p> Signup and view all the answers

Who is correct: Technician A says you should use a rosin core solder when repairing electrical circuits. Technician B says you should not overheat the repair.

<p>Both Technician A and Technician B (C)</p> Signup and view all the answers

Solderless terminals are _____ to install and _____ at conducting electricity across joints that are designed to be disconnected.

<p>Quick; effective</p> Signup and view all the answers

Who is correct: Technician A says that solder should be applied to the soldering iron tip while soldering. Technician B says that the solder should be applied to the wire joint while soldering.

<p>Technician B (A)</p> Signup and view all the answers

Who is correct: Technician A says that when soldering, the hotter the better, as it causes the solder to wick up the wires. Technician B says that the stripped ends of wires to be soldered should be laid parallel to each other to minimize resistance of the joint.

<p>Neither Technician A nor Technician B (D)</p> Signup and view all the answers

The most effective and safest tool to use to strip insulation from electrical wire is a:

<p>Set of wire strippers</p> Signup and view all the answers

When tracing and coloring a wire on a wiring diagram, coloring a wire(s) orange means that wire in the circuit is:

<p>Switched to power.</p> Signup and view all the answers

Who is correct: Technician A says that wire colors are listed. Technician B says that connectors are listed.

<p>Both Technician A and Technician B (C)</p> Signup and view all the answers

When tracing and coloring a wire on a wiring diagram, coloring a wire(s) orange means that wire in the circuit is:

<p>NOT Switched to power.</p> Signup and view all the answers

Who is correct: Technician A says wiring diagrams are like maps of the entire electrical system. Technician B says wiring diagrams have very little information and are not much help.

<p>Technician A (D)</p> Signup and view all the answers

Wiring diagrams give information about:

<p>Electrical circuits and their components.</p> Signup and view all the answers

Flashcards

Fuse Rating

The maximum current a fuse can handle before it blows.

Circuit Breaker Rating

The maximum current a circuit breaker can handle before it trips.

Switch Type

Different types of switches include toggle, rotary, and push-button.

Switch Function

An electrical device controlling current flow.

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Turn Signal Switch

A complex switch with three positions (off, left, right).

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Relay Operation

Using low current to control a higher current.

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Relay Type (NO)

Normally Open relay contact, closed when activated.

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Relay Type (NC)

Normally Closed relay contact, open when activated.

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Relay Terminals

Automotive relay terminals 87/5 (NO) and 30/3 (Common).

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High Wattage Resistor

Using ceramic form for heat dissipation.

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Variable Resistor Types

Rheostats, potentiometers, and thermistors.

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Resistor Marking

Four or five colored bands indicate value.

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NTC Resistor

Decreases resistance as temperature increases.

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Electric Motor Armature

The electromagnet part of an electric motor.

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Electric Motor Function

Uses magnetic fields to create rotary motion.

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Electric Motor Components

Armature and field.

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Automotive Wire

Multi-stranded copper core with plastic insulation.

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AWG System

American Wire Gauge system, higher number means smaller wire.

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Metric Wire Size

Cross-sectional area in mm^2.

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Automotive Wiring Complexity

Modern cars have over a mile of wiring with thousands of wires.

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Rosin Core Solder

Recommended for electrical repairs.

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Solder Application

Apply solder to wire joint, not soldering iron tip.

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Solderless Terminals

Quick and effective electrical connections.

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Wiring Diagrams

Maps of electrical systems showing components and connections.

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Wiring Diagram Color

Wiring diagrams use specific colors to represent power status.

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Study Notes

Fuses and Circuit Breakers

  • Fuses and circuit breakers are rated in amps, which are usually marked on the device.
  • Fuses prevent circuit damage by stopping excessive current flow.

Switches

  • Various types of switches include toggle switches, rotary switches, and push-button switches, but friction switches are not included.
  • A switch is an electrical device used to turn current on and off in a circuit.
  • Turn signal switches are complex switches with three positions: center/off, one circuit on, another circuit on.

Relays

  • Relays operate with a small amount of current and can be normally closed (NC) or normally open (NO).
  • Using a small current in the relay winding controls a larger current through the relay contacts.
  • Automotive relay terminal 87 or 5 signifies a NO fixed contact to the common, while terminal 30 or 3 denotes the common-movable switch contact.

Resistors

  • High wattage resistors use a ceramic form for dissipating heat.
  • Variable resistors include rheostats, potentiometers, and thermistors.
  • Resistors are often marked with four or five colored bands to indicate their value.
  • NTC resistors decrease resistance as temperature increases.

Electric Motors

  • The armature in an electric motor is an electromagnet.
  • Electric motors utilize magnetic fields to create rotary movement, while relays and solenoids do not.
  • Components generating motion in an electric motor are the armature and the field.

Wires

  • Automotive wire typically has a multi-stranded copper core with seamless plastic insulation.
  • The American wire gauge (AWG) system indicates that a larger rating number corresponds to a smaller wire with lower current-carrying capacity.
  • A wire described as metric size 8.0 has a cross-sectional area of 8.0 mm.

Wiring and Soldering

  • Modern automobiles can contain over 1 mile of wiring with more than 1,000 individual wires.
  • Rosin core solder is recommended for electrical repairs, and care should be taken not to overheat the repair.
  • Solderless terminals are quick to install and effective at conducting electricity across disconnect points.
  • Solder should be applied to the wire joint, not the soldering iron tip, during the soldering process.

Wiring Diagrams

  • Wiring diagrams are akin to maps of the electrical system and provide essential information regarding wiring colors and connectors.
  • An orange wire in a wiring diagram indicates it is switched to power, whereas if it is marked as NOT switched to power, it has no active connection.
  • Diagrams illustrate electrical circuits and their components, enhancing the understanding of complex systems.

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Test your knowledge with these flashcards covering key concepts from Chapter 57 of Electrical Engineering. Topics include fuses, circuit breakers, switches, and more. Perfect for reinforcing learning and preparing for exams.

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