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Electrical Foundations (Common Core) > Line E > Flashcards

Line E Flashcards

1
Q

What are the tiny particles that matter is made of called?

a. Compounds
b. Atoms
c. Ions
d. Protons and neutrons

A

Atoms

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2
Q

What are elements called that have atoms with electrons that are easily freed?

a. Ions
b. Conductors
c. Insulators
d. Elements

A

Conductors

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3
Q

Which of the following best describes copper?

a. Conductor
b. Insulator
c. Semiconductor
d. Valence electron

A

Conductor

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4
Q

Why are insulators useful?

a. They transport an electrical charge.
b. They do not transport an electrical charge.
c. They readily release valence electrons.
d. They will ionize easily when subjected to voltage.

A

They do not transport an electrical charge.

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5
Q

In what units is current measured?

a. Volts
b. Amperes
c. Ohms
d. EMF

A

Ampres

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6
Q

A source of electromotive force can be from a chemical reaction.

A

True

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7
Q

In a DC circuit the poles alternate from positive to negative.

A

False

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8
Q

What is the device called that is used to turn a circuit on and off?

a. A control
b. A conductor
c. A load
d. A protector

A

A control

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9
Q

Which of the following best describes an electric motor?

a. A control
b. A load
c. A fuse
d. A conductor

A

A load

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10
Q

If resistance in a circuit is 6 Ω and the pressure is 24 V, what is the current flow?

a. 2 A
b. 4 A
c. 6 A
d. 8 A

A

4 A

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11
Q

If a circuit had a current flow of 8 A and the resistance is 20 Ω, what is the pressure in volts?

a. 120 V
b. 160 V
c. 2.5 V
d. 25 V

A

160V

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12
Q

If a circuit has a current flow of 5 A and a pressure of 120 V, what is the resistance?

a. 24 Ω
b. 12 Ω
c. 6 Ω
d. 3 Ω

A

24 Ω

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13
Q

How much power will a heater produce if it uses 15 A in a 120 V electrical system?

a. 1800 W
b. 1500 W
c. 900 W
d. 1200 W

A

1800 W

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14
Q

How many amps will flow through a 60 W headlight bulb in a 24 V system?

a. 6 A
b. 2.5 A
c. 25 A
d. 8 A

A

2.5 A

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15
Q

Use Ohm’s law to complete the following chart.

A
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16
Q

Use the power formula to complete the following chart.

A
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17
Q

What takes the place of a ground return wire in a single wire system?

a. Fuse
b. Case ground
c. Circuit breaker
d. Chassis

A

Chassis

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18
Q

How many paths does a series circuit have for current flow?

a. 1
b. 2
c. 3
d. 4

A

1

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19
Q

What is a circuit called that has more than one path for current flow?

a. Series circuit
b. Complex circuit
c. Compound circuit
d. Parallel circuit

A

Parallel circuit

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20
Q

What must the total voltage drop in a circuit be equal to?

a. The source voltage
b. The first voltage drop
c. Half the source voltage
d. Twice the source voltage

A

The source voltage

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21
Q

A 12 V circuit with a 4 ohm resistor will have a current of 6 A.

A

False

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22
Q

A 120 V circuit with a current of 10 A will have a load with what resistance?

a. 12 Ω
b. 24 Ω
c. 6 Ω
d. 10 Ω

A

12 Ω

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23
Q

If one load fails in a parallel circuit, all other loads will fail.

A

False

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24
Q

What is the total resistance in a series circuit with four resistors rated at 2 Ω each?

a. 2 Ω
b. 4 Ω
c. 6 Ω
d. 8 Ω

A

8 Ω

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25
Q

A 120 V parallel circuit has three resistors: 20 Ω, 12 Ω, and 24 Ω. What is the current?

a. 6 A
b. 18 A
c. 21 A
d. 24 A

A

21 A

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26
Q

What is the total resistance for a 120 V circuit with three resistors of 20 Ω, 12Ω, and 24 Ω in parallel?

a. 6 Ω
b. 8 Ω
c. 12 Ω
d. 24 Ω

A

6 Ω

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27
Q

There are three types of magnets: natural, artificial, and electric.

A

True

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28
Q

Natural magnets have the strongest force.

A

False

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29
Q

If the south poles of two magnets are brought together, what they will do?

a. Conduct
b. Relate
c. Saturate
d. Repel

A

Repel

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30
Q

Changing which of the following will also change the strength of an electromagnet?

a. Direction of current flow
b. Size of wires
c. The length of the core
d. Amount of current flow

A

Amount of current flow

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31
Q

What is the core of an electromagnet usually made from?

a. Air
b. Soft iron
c. Aluminum
d. Copper

A

Soft iron

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32
Q

What two elements must be combined with a conductor to generate a voltage?

a. Magnetic field and a current
b. Current and movement
c. Coil and a magnet
d. Magnetic field and movement

A

Magnetic field and movement

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33
Q

Magnetic lines of force never cross.

A

True

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34
Q

Match the device on the left with its purpose on the right.

a. Circuit breaker 1. Protects circuits
b. Relay 2. Electric switch
c. Solenoid 3. Variable control
d. Rheostat 4. Movable core

A

a. Circuit breaker (1. Protects circuits)
b. Rheostat (3. Variable control)
c. Relay (2. Electric switch)
d. Solenoid (4. Movable core)

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35
Q

What best describes tapped or stepped resistors?

a. They have two or more fixed values.
b. They have only one unchangeable rating.
c. They have a variable range of resistance.
d. They are used to control charging systems.

A

They have two or more fixed values.

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36
Q

How is a fuse different from a circuit breaker?

a. A fuse acts like a diode.
b. A circuit breaker doesn’t need a ground.
c. A fuse can be reset and a circuit breaker cannot.
d. A circuit breaker can be reset and a fuse cannot.

A

A circuit breaker can be reset and a fuse cannot.

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37
Q

6 gauge wire is smaller than 18 gauge.

A

False

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38
Q

What are conductors normally made from?

a. Steel
b. Copper
c. Soft iron
d. Aluminum

A

Copper

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39
Q

Receptacles are one-half of a two-piece multi-contact connector.

A

True

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40
Q

What are circuit breakers, fuses, and thermal limiters all examples of?

a. Relays
b. Switches
c. Receptacles
d. Protection devices

A

Protection devices

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41
Q

How many gauges of difference must there be between a fusible link and a conductor?

a. 2
b. 4
c. 6
d. 8

A

4

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42
Q

Relays require a power circuit and a control circuit.

A

True

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43
Q

What are transformers used for?

a. To act like a relay
b. To increase amperage
c. To increase or decrease voltage
d. To change the current from DC to AC

A

To increase or decrease voltage

44
Q

Who is responsible for testing all electrical components?

a. ITA
b. NSA
c. CSA
d. DNA

A

CSA

45
Q

Closed means the circuit is complete and conducting.

A

True

46
Q

What voltage other than 120 V does a residential system use?

a. 180 V
b. 200 V
c. 240 V
d. 280 V

A

240V

47
Q

A schematic diagram is often called a ladder diagram.

A

True

48
Q

What is the fourth type of wiring diagram, in addition to schematic, wiring, and block
diagrams?

a. Line
b. Oblique
c. Pictorial
d. Isometric

A

Pictorial

49
Q

A schematic diagram shows all physical locations of components.

A

False

50
Q

For which operations is a wiring diagram best suited?

a. Diagnosing
b. Sequencing
c. Installation
d. Troubleshooting

A

Installation

51
Q

A pictorial diagram is used to locate components in complex systems.

A

True

52
Q

A block diagram includes symbols.

A

False

53
Q

Typical house wiring is an example of a series circuit.

A

False

54
Q

If one load fails in a series circuit, what happens to the other loads?

a. They will all fail.
b. A fuse will blow.
c. Nothing happens.
d. The rest remain working.

A

They will all fail.

55
Q

As more resistors are added in series, what increases?

a. Power
b. Voltage
c. Current
d. Resistance

A

Resistance

56
Q

A series circuit allows the control of current flow.

A

True

57
Q

Which of the following is true about a parallel circuit?

a. Voltage will be different at each load.
b. Voltage will be the same at each load.
c. Current will be the same at each load.
d. Resistance will be the same at each load.

A

Voltage will be the same at each load.

58
Q

The three-wire circuit is an example of which of the following?

a. Hot jumping
b. Series aiding
c. Parallel aiding
d. Backpacking circuit

A

Series aiding

59
Q

For what purpose is a circuit grounded?

a. Safety
b. Series aiding
c. Circuit protection
d. Easier installation

A

Safety

60
Q

What is the result of connecting three 6 V batteries in series?

a. 12 volts are produced.
b. 18 volts are produced.
c. 24 volts are produced.
d. The voltage doesn’t change.

A

18 volts are produced.

61
Q

Which of the following must apply to power sources connected in parallel?

a. Unlike terminals must be connected.
b. They must be connected with a fuse.
c. Like terminals must be connected.
d. They must have a transformer between them.

A

Like terminals must be connected.

62
Q

For voltages to accumulate in series aiding, what must occur?

a. Correct polarity
b. Circuit protection
c. Similar amperages
d. Dissimilar amperage

A

Correct polarity

63
Q

If two 12 V batteries are connected in parallel, what will the voltage be across any load?

a. 6 V
b. 12 V
c. 24 V
d. 48 V

A

12 V

64
Q

Which term best describes a material that allows electrical energy to pass through it?

a. Resister
b. Insulator
c. Conductor
d. Connector

A

Conductor

65
Q

Which of the following best describes the term electrical cable?

a. Any wire
b. Any insulated wire
c. Multiple wires grouped together in a common insulation
d. Multiple insulated wires grouped together in a common sheathing

A

Multiple insulated wires grouped together in a common sheathing

66
Q

What is the primary purpose of insulation on wires?

a. To protect the wire
b. To make installation easier
c. To prevent unwanted current flow
d. So the wire can be colour coded

A

To prevent unwanted current flow

67
Q

When is stranded wire used?

a. On short wires
b. When cost is a factor
c. On straight runs of wire
d. When flexibility is needed

A

When flexibility is needed

68
Q

Wire is sized by gauge: the higher the number, the larger the wire.

A

False

69
Q

What should be done to stranded wire prior to bending?

a. It should be curled.
b. It should be tinned.
c. It should be wound.
d. It should be twisted.

A

It should be tinned.

70
Q

Solderless connections are more costly than soldering.

A

False

71
Q

What is one advantage to a twist-on connector?

a. It is permanent.
b. One size fits all.
c. It will not come apart.
d. It can be removed easily.

A

It can be removed easily

72
Q

It doesn’t matter what material the conductor is made from when making a connection.

A

False

73
Q

What type of connector should be used to create a permanent splice?

a. Twist
b. Winged
c. Crimp-on
d. Set screw

A

Crimp-on

74
Q

Safety factors such as toxic fumes and splashing flux should always be addressed when soldering.

A

True

75
Q

Which of the following best describes the process of surface penetration?

a. Bonding
b. Wetting
c. Soldering
d. Prepping

A

Wetting

76
Q

Which of the following should apply when tinning stranded wire?

a. The strands should be thickly coated.
b. The strands should be visible under the solder.
c. The solder should wick up underneath the insulation.
d. A large blob of solder should form at the end of the wire.

A

The strands should be visible under the solder.

77
Q

Metals like aluminum and iron wet easily.

A

False

78
Q

What is the purpose of flux?

a. To remove oxides
b. To clean the metal
c. To assist with heating
d. To remove the solder

A

To remove oxides

79
Q

What is the most common alloy used for solder?

a. Tin-lead
b. Lead-silver
c. Tin-copper
d. Lead-copper

A

Tin-lead

80
Q

Soldering pencils are used for heavy-duty applications.

A

False

81
Q

What must be done to a soldering tip prior to soldering?

a. Tin it.
b. Wash it.
c. Wire brush it.
d. Heat it red hot.

A

Tin it.

82
Q

What should be done to an overly corroded soldering tip?

a. Nothing.
b. Re-tin it.
c. Throw it away.
d. Dress it with a fine file.

A

Dress it with a fine file.

83
Q

What is the purpose of a heatsink?

a. To protect the solder
b. To pull flux to the joint
c. To pull heat to the area for soldering
d. To pull heat away from certain components

A

To pull heat away from certain components

84
Q

What would cause a solder joint to be piled up and lumpy in appearance?

a. Insufficient heat
b. Lack of flux
c. Poor tinning
d. A corroded tip

A

Insufficient heat

85
Q

What are multimeters used to test, in addition to amperage and voltage?

a. Pressure
b. Humidity
c. Resistance
d. Temperature

A

Resistance

86
Q

Analog meters are more popular than digital.

A

False

87
Q

How many volts are in 2200 mV?

a. 0.22 V
b. 2.2 V
c. 22 V
d. 220 V

A

2.2 V

88
Q

It is important to turn the circuit off before checking voltage.

A

False

89
Q

What would happen if you connected the probes backwards when checking voltage?

a. Damage to the DDM would occur.
b. Damage to the circuit would occur.
c. A negative voltage would be read.
d. It doesn’t matter which way they go.

A

A negative voltage would be read.

90
Q

What is one important safety technique when testing electrical circuits?

a. Wearing gloves
b. Wearing safety glasses
c. Using the one-hand technique
d. Using the two-hand technique

A

Using the one-hand technique

91
Q

The first step when using an autorange DDM is to select the range required.

A

False

92
Q

A circuit must be broken to test current.

A

False

93
Q

Is an amperage test done in series or parallel?

a. Series
b. Parallel

A

Series

94
Q

When is it important to turn off a DDM to extend battery life?

a. After checking voltage
b. After checking amperage
c. After checking resistance
d. Never; it turns off automatically

A

After checking resistance

95
Q

When the probes are touched together in a resistance test, what should the meter read?

a. 0
b. Infinity
c. OL
d. Nothing

A

0

96
Q

How many ohms are in 2.125 kΩ?

a. 21.25 Ω
b. 212.5 Ω
c. 2125 Ω
d. 21 250 Ω

A

2125 Ω

97
Q

What is the name of the test used when testing a circuit for an open?

a. Infinity test
b. Overload test
c. Continuity test
d. This test cannot be done.

A

Continuity test

98
Q

What is the lowest amperage at which fatal injury can occur in a human?

a. 15 A
b. 0.15 A
c. 50 mA
d. 15 mA

A

50 mA

99
Q

If you measure voltage across a switch, what state is it in?

a. Open
b. Closed

A

Open

100
Q

If you measure correct voltage across a load but the load doesn’t work, what is wrong?

a. There is no power.
b. There is no current.
c. A switch is open.
d. The load has failed.

A

The load has failed.

101
Q

Refer to Figure 1. If you have a reading at point 4, but not at 5, what is the problem?

a. The load has failed.
b. The switch is open.
c. The wiring has failed.
d. The ground has failed.

A

The wiring has failed.

102
Q

Refer to Figure 1. If you have a reading at 5 and zero at 6, what is the problem?

a. The load has failed.
b. The switch is open.
c. The wiring has failed.
d. The ground has failed.

A

The load has failed.

103
Q

What is always the first step when testing for resistance?

a. Check the load.
b. Remove the component.
c. Turn the circuit power on.
d. Turn the circuit power off.

A

Turn the circuit power off.

104
Q

What is the best test for checking if a heating element is faulty?

a. Voltage test
b. Continuity test
c. Amperage test
d. They cannot be tested.

A

Continuity test

105
Q

What will increase when power sources are connected in series?

a. Voltage
b. Current
c. Resistance
d. Continuity

A

Voltage

Electrical Foundations (Common Core) (7 decks)

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