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EM1 > MOD 1 > Flashcards

MOD 1 Flashcards

1
Q

Matter can be found in what form

A

Solid, liquid, and gas

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2
Q

A substance that can not be reduced to a simpler substance by chemical means is called

A

Element

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3
Q

A molecule is the smallest possible particle that retains the characteristics of which of the following substances?

A

Compound

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4
Q

An atom is the smallest possible particle that retains the characteristics of what?

A

An element

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5
Q

What subatomic particle has a negative charge and a small mass?

A

Electron

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6
Q

What subatomic particle has a positive charge and a large mass

A

Proton

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7
Q

What subatomic particle has no charge

A

Neutron

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8
Q

When light is represented as a tiny packet of energy what are these packets of energy called?

A

Photons

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9
Q

If light energy collides with an orbiting electron what happens to the electron?

A

The electron will jump to an orbit further from the nucleus

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10
Q

After an electon jumps to an orbit fruther from the nucleus the electron will return to the condition it had before being acted upon by the light. When the electron returns to this condition, what occurs?

A

Light energy is emitted

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11
Q

The number of electrons in the outermost shell of an atom determines which of the following characteristics of the atom?

A

Valence

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12
Q

When an atom gains or loses an electron what term applies?

A

Ionized

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13
Q

What is the main difference between conductors, semiconductors, and insulators?

A

The number of free electrons

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14
Q

A substance with an excess of electrons is considered to be in what electrical state?

A

Negative

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15
Q

Easiest way to accumulate a static electric charge

A

Friction between two insulators

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16
Q

An atom that contains 6 protons and 5 electrons has what electrical charge

A

Positive

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17
Q

How do “like” and “unlike” charges react to ine another?

A

Unlike charges attract each other, like charges repel each other

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18
Q

What are the terms applied to the space between and around charged bodies in which their influence is felt?

A

Electric field of force, electrostatic field, dielectric field

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19
Q

Electrostatic linea of force are drawn in which of the following manners

A

Entering negative charge leaving positive charge

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20
Q

Which of the following devices use magnetism?

A

High-fidelity speakers

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21
Q

Magnetism materials have what qualities

A

They are attracted by magnets and can be magnetized

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22
Q

Ferromagnetic materials have which of the following qualities

A

They are relatively easy to magnetize

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23
Q

A material with low reluctance and high permeability such as iron or soft steel is used to make what type of magnet

A

Temporary

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24
Q

The abolity of a material to retain magnetism is called

A

Retentivity

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25
Q

The law of magnetic poles states which of the following relationships

A

Like poles repel, unlike poles attract

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26
Q

The north indicating pole of a compass needle is attracted to which of the following poles of the earth

A

The magnetic north pole

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27
Q

Webers theory of magnetism assumes that magnetic materia is composed of

A

Tiny molecular magnets

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28
Q

According to the domain theory, if an atom with 26 electrons has 20 electrons spinning counterclockwise the atom is considered to be

A

Magnetized

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29
Q

If a glass playe is places over a magnet and the iron fillings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate?

A

The magnetic field

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30
Q

An imaginary line used to illustrate a magnetic effect is known as a

A

Magnetic line of force

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31
Q

Do magnetic lines of force ever cross

A

No

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32
Q

A magnetic shield or screen used to protect a delicate instrument should be made of what material

A

Soft iron

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33
Q

Bar magnets should be stored in which of the following manners

A

In pairs with north and south pole together

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34
Q

What is the term applied to the ability to do work

A

Energy

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35
Q

An object in motion has what kind of energy

A

Kinetic

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36
Q

A book sitting on a shelf has what kind of energy

A

Potential

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37
Q

What term applies to the difference of potential between two bodies

A

Voltage or electromotive force

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38
Q

What is 2.1kV converted

A

2100V

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39
Q

What are different ways to write 250micro volts

A

.25mV
.00025V
250x10^-6 V

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40
Q

What is the general term that describes a device which aupplies voltage

A

A voltage source

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41
Q

In addition to friction magnetism and chemical action what method can be used to produce voltage

A

Pressure, light, heat

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42
Q

What method of voltage does a radio receivers oscillator use

A

Pressure

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43
Q

What method of voltage does a thermocouple use

A

Heat

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44
Q

What method of voltage does an auto battery use

A

Chemical action

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45
Q

What method of voltage does a auto generator use

A

Magnetism

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46
Q

What method of voltage does a flashlight cell use

A

Chemical action

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47
Q

Current in an electric circuit is caused by what

A

Electrons moving from negative to positive

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48
Q

When directed drift takes place what speed

A

186,000miles per second

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49
Q

If voltage in a circuit increases what happens to current

A

Increases

50
Q

What ampere is equal to 100mA

A

.10 ampere

51
Q

What symbol is used to represent ohm

A

♎️

52
Q

If low weight is the major factor what material should be used as a conductor

A

Aluminum

53
Q

What material is most widely used as a conductor in electrical equipment

A

Copper

54
Q

Resistance of a conductor will increase with which of the following changes to the cross-sectiknal area and length of the conductor

A

Cross sectional area decreased length increased

55
Q

A material whose resistance decreases as the temperature increases has what temp coefficient

A

Negative

56
Q

A material whose resistance remains constant as the temp increases has what temp coefficient

A

Zero

57
Q

What is not a unit of conductance

A

Ohm

58
Q

Resistance bears which if any relationship to conductance

A

Reciprocal

59
Q

What schematic symbol represents a resisitor

A

Squiggle line

60
Q

How is the abolity of a resistor to dissipate heat indicated

A

Wattage rating

61
Q

Carbon resistors have which of the following disadvantages

A

Resistance value changes with age

62
Q

What resistor overcomes rhe disadvantages of carbon

A

Wirewound resistors

63
Q

What total number of connections does a rheostat have

A

2

64
Q

What total number of connections does a potentiometer have

A

3

65
Q

What type of variable resisitor is used to control a large amount of current

A

Rheostat

66
Q

A carbon resistor color coded orange orange orange has what resistance value

A

33 kilo ohms

67
Q

What are the allowable limits of ohmic value in a resistor color coded blue green yellow gold

A

682.5 killo ohms to 617.5 k ohms

68
Q

What fifth color band on a resistor is least chance of failure

A

Yellow

69
Q

What is the purpose of an electrical cell?

A

Convert chemical energy to electrical energy

70
Q

What are the three basics parts of an electrical cell?

A

Electrodes, electrolyte, container

71
Q

Describe electrolyte

A

Solution acting upon the electrode

72
Q

Describe container

A

Mounting for the electrode

73
Q

Describe anode

A

Positive electrode

74
Q

Describe cathode

A

Negative electrode

75
Q

What term is given to the process that takes place inside a cell?

A

Electrochemical action

76
Q

With respect to recharging a primary or secondary cell, of the following statements, which one is correct?

A

The secondary cell can be recharged by passing current through it in the proper direction

77
Q

What determines the amount of current that a cell can deliver to the external circuit?

A

The internal resistance of the cell only

78
Q

What causes negative ions to be attracted to the cathode of a primary cell while the cell is discharging?

A

A positive charge causes by a loss of electrons

79
Q

What causes hydrogen to be attracted to the anode of a primary cell when the cell is discharging?

A

A negative charge caused by an excess of electrons

80
Q

Which actions will lower internal resistance of a cell

A

Increasing the space between electrodes (ask Garcia)

81
Q

What causes the cathode to be “eaten away” in the primary cell while the cell is discharging

A

The material of the cathode combines with the negative ions to form a new substance

82
Q

The primary cell is completely discharged when which of the following conditions exist?

A

The cathode is completely eaten away, the active ingredient in the electrolyte is used up, the voltage of the cell is reduced to zero

83
Q

In a zinc-carbon primary cell, what is the function of the carbon electrode

A

To supply a return path for current

84
Q

The lead-acid cell is an example of which of the following types of cells?

A

The secondary cell

85
Q

In a full charged lead-acid cell, what is the composition of the anode, cathode, and electrolyte respectively

A

Lead peroxide, sponge lead, sulfuric acid, and water

86
Q

Which of the following actions will recharge a secondary cell?

A

Connecting the negative terminal of a voltage source to the cathode of the cell and the positive terminal of the voltage source to the anode cell

87
Q

When the lead-acid cell is discharging what are the chemical actions

A

Sulfuric cause decreasing, sponge lead decreasing, lead peroxide decreasing, lead sulfate increasing

88
Q

When the lead-acid cell is charging what are the chemical actions

A

Sulfuric cause increasing, sponge lead increasing, lead peroxide increasing, lead sulfate decreasing

89
Q

When all the lead sulfate in a lead acid cell is converted to sulfuric acid, lead peroxide and sponge lead what is the condition of the cell

A

Fully charged

90
Q

Polarization has what effects on an electrical cell

A

Increases internal resistance, thereby decreasing the output voltage

91
Q

Which of the following methods is used to control polarization in a cell

A

Venting the cell

92
Q

Which of the following is caused by local action in a cell

A

Shelf life is reduced

93
Q

In a dry cell, what is the consistency of the electrolyte

A

Paste

94
Q

What serves as the cathode in a Common type of dry cell

A

Zinc container

95
Q

How should the dry cell be stored to obtain max shelf life

A

In a Refrigerated space

96
Q

The blotting paper in a dry cell serves what purpose

A

Separates the paste from the zinc, permits the electrolyte from the paste to filter through to the zinc slowly

97
Q

Of the following characteristics, which one describes the mercury cell

A

It has a very stable output voltage

98
Q

What is the shorting of a cell

A

Connecting the anode and cathode together without a load

99
Q

What are the advantages of using a manganese-dioxide-alkaline-zinc cell over the zinc-carbon cell

A

Better voltage stability
Longer storage life
Operates over a wide temperature range

100
Q

What is the common name for manganese-dioxide-alkaline-zinc cell

A

Alkaline cell

101
Q

What factors should be considered when selecting a primary cell as a power source

A

Power requirement

102
Q

Of the following types of cells, which one is a primary cell

A

Lithium organic

103
Q

What are the differences in the construction of a NICAD cell as compared to a lead-acid cell

A

The electrolyte used the material of the anode and the material of the cathode

104
Q

What is the most common use of a silver zinc cell?

A

Emergency equipment batteries

105
Q

In addition to the nickel-cadmium and silver-zinc cells, which of the following cells uses potassium hydroxide as the active ingredient in the electrolyte

A

Silver-cadium

106
Q

What is the minimum number of cells necessary to form a battery

A

One

107
Q

What is the first step in performing maintenance on a secondary-cell battery

A

Check the technical manual for information on the specific type of battery

108
Q

When a hydrometer is used to check the specific gravity of the electrolyte in a battery to what level should the electrolyte be drawn?

A

Enough so the float will rise without entering the suction bulb

109
Q

To flush a hydrometer, which of the following liquids should be used

A

Fresh water

110
Q

If the electrolyte level in a battery is low, what should be added to the electrolyte to bring it to the proper level

A

Distilled water

111
Q

What safety precautions for batteries are not used

A

Terminals should be electrically connected together

112
Q

If electrolyte comes in contact with the skin, what first aid treatment should be given immediately to the affected area

A

Flush with fresh water

113
Q

A battery with a capacity of 600 ampere-hours should provide 3 amperes for a max of how many hours

A

200

114
Q

A battery is rated according to a 20hr rate of discharge at 300 ampere hours. What is the max current that will allow the battery to deliver its rated capacity

A

15 amperes

115
Q

What types of routine charges follow the name plate data in restoring a battery to its charged condition during the ordinary cycle of operation

A

Normal

116
Q

If violent gassing occurs during the charging of a battery, which of the following actions should be taken

A

Decrease charging rate

117
Q

If a battery is being charged at the proper rate which if any of the following types of gassing should occur

A

Steady gassing.

118
Q

Initial charge

A

Used after electrolyte is added to a dry-shipped battery

119
Q

Equalizing charge

A

Used periodically as part of a Maintenance routine

120
Q

Floating charge

A

Used to keep a battery at full charge while the battery is idle

121
Q

Fast charge

A

Used in emergency only

EM1 (12 decks)

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