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"CE" E6 REGULAR EXAM SEP 2014 > NAVEDTRA 14173A NEETS MODULE 1 CHAPTER 1 > Flashcards

NAVEDTRA 14173A NEETS MODULE 1 CHAPTER 1 Flashcards

1
Q

Matter can be found in which of the following forms?

A
  1. Solid
  2. Liquid
  3. Gaseous
  4. EACH OF THE ABOVE
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2
Q

A substance that CANNOT be reduced to a simpler substance by chemical means is called a/an

A
  1. element
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3
Q

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

A
  1. A compound
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4
Q

An atom is the smallest possible particle that retains the characteristic of which of the following substances?

A
  1. An element
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5
Q

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

A
  1. Electron
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6
Q

What subatomic particle has a positive charge and a large mass?

A
  1. Proton
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7
Q

What subatomic particle has no charge?

A
  1. 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
  1. 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 the action described in question 1-9 occurs, the electron will return to the condition it had before being acted upon by the light. When the electron returns to this condition, which of the following actions occurs?

A

The valence of the atom changes

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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
  1. Valence
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12
Q

When an atom gains or loses an electron, which of the following terms 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

Which of following actions describes the easiest way to accumulate a static electric charge?

A
  1. Friction between two insulators
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16
Q

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

A
  1. Positive
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17
Q

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

A

Unlike charges attract each other, like charges repel each other

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18
Q

What is/are the term(s) applied to the space between and around charged bodies in which their influence is felt?

A
  1. Electric field of force
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19
Q

Electrostatic lines of force are drawn in which of the following manners?

A
  1. Entering negative charge, leaving positive charge
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20
Q

Which of the following devices use magnetism?

A
  1. High-fidelity speakers
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21
Q

Magnetic materials have which of the following qualities?

A
  1. They are attracted by magnets
  2. They can be magnetized
  3. BOTH 1 AND 2
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22
Q

Ferromagnetic materials have which of the following qualities?

A
  1. 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
  1. Temporary
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24
Q

The ability of a material to retain magnetism is called

A
  1. retentivity
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25
Q

The law of magnetic poles states which of the following relationships?

A
  1. 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
  1. The geographic north pole
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27
Q

Weber’s theory of magnetism assumes that magnetic material is composed of

A
  1. atoms with electrons spinning different directions
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28
Q

According to the domain theory, if an atom with 26 electrons has 20 electrons spinning counter clock-wise, the atom is considered to be

A
  1. magnetized
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29
Q

If a glass plate is placed over a magnet and iron filings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate?

A
  1. The magnetic field
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30
Q

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

A
  1. magnetic line of force
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31
Q

Which of the following is NOT a property of magnetic lines of force?

A
  1. They cross each other at right angles
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32
Q

A magnetic shield or screen used to protect a delicate instrument should be made of which of the following materials?

A
  1. Soft iron
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33
Q

Bar magnets should be stored in which of the following manners?

A
  1. In pairs with a north pole and a south pole together
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34
Q

What is the term applied to the ability to do work?

A
  1. Energy
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35
Q

An object that is in motion has what type of energy?

A
  1. Kinetic
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36
Q

A book sitting on a shelf has what kind of energy?

A
  1. Potential
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37
Q

Which of the following term(s) apply(ies) to the difference of potential between two bodies?

A
  1. Voltage
  2. Electromotive force
  3. BOTH 1 AND 2
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38
Q

Which of the following terms is equal to “2.1 kV?”

A
  1. 2100 V
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39
Q

250μV is equal to which of the following terms?

A
  1. .25 mV
  2. .00025 V
  3. 250 x 10-6 V
  4. ALL OF THE ABOVE
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40
Q

What is the general term that describes a device which supplies a voltage?

A
  1. A voltage source
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41
Q

In addition to friction, magnetism, and chemical action, which of the following methods can be used to produce a voltage?

A
  1. Pressure
  2. Heat
  3. Light
  4. EACH OF THE ABOVE
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42
Q

Voltage producing method of:

Radio receiver’s oscillator

A
  1. Pressure
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43
Q

Voltage producing method of:

Thermocouple

A
  1. Heat
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44
Q

Automobile battery

A
  1. Chemical action
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45
Q

Automobile generator

A
  1. Magnetism
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46
Q

Flashlight cell

A
  1. Chemical action
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47
Q

Current in an electric circuit is caused by which of the following actions?

A
  1. Electrons moving from negative to positive
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48
Q

When directed drift takes place, at what speed does the effect take place?

A
  1. 186,000 miles per second
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49
Q

If the voltage in a circuit increases, what happens to the current?

A
  1. Current increases
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50
Q

Which of the following values is equal to 100mA?

A
  1. 0.10 ampere
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51
Q

What symbol is used to represent the ohm?

A

Ω

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52
Q

If low weight is the major factor, which of the following materials should be used as a conductor?

A
  1. Aluminum
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53
Q

What material is MOST widely used as a conductor in electrical equipment?

A
  1. Copper
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54
Q

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

A
  1. Cross-sectional area is decreased, length is decreased
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55
Q

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

A
  1. Negative
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56
Q

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

A
  1. Zero
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57
Q

Which of the following units is NOT a unit of conductance?

A
  1. Ohm
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58
Q

Resistance bears which, if any, of the following relationships to conductance?

A
  1. A reciprocal relationship
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59
Q

Which of the following schematic symbols is used to represent a resistor?

A

GOT TO GET PIX

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60
Q

How is the ability of a resistor to dissipate heat indicated?

A
  1. By the wattage rating
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61
Q

Carbon resistors have which of the following disadvantages?

A
  1. The resistance value changes with age
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62
Q

Which of the following types of resistors will overcome the disadvantages of a carbon resistor?

A
  1. Wirewound resistor
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63
Q

What is the total number of connections on (a) a rheostat and (b) a potentiometer?

A
  1. (a) Two (b) three
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64
Q

Which, if any, of the following types of variable resistors is used to control a large amount of current?

A
  1. Wirewound potentiometer
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65
Q

A carbon resistor is color-coded orange, orange, orange. What is the resistance value of this resistor?

A
  1. 33.0 kΩ
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66
Q

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

A
  1. 682.5 kΩ to 617.5 kΩ
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67
Q

Of the following, which color of the fifth band on a resistor indicates the LEAST
chance of failure? BROWN, RED, ORANGE, YELLOW

A

YELLOW

68
Q

ACRONYM for simplifying the color code

A

Bad, Boys, Run, Over, Yellow, Gardenias, Behind, Victory, Garden, Walls

69
Q

The color of the first band of a resistor indicates what?

A

the value of the first significant digit

70
Q

the color of the second band of a resistor indicates what?

A

the value of the second significant digit

71
Q

The color of the third band of a resistor represents what?

A

a decimal multiplier by which the first two digits must be multiplied to obtain the resistance value

72
Q

The color of the fourth band of a resistor represents what?

A

The tolerance band, which usually does not present too much of a problem

73
Q

Which band would present a problem if mistaken?

A

The third band, because the value will be too high or too low.

74
Q

When the third band is black, the resistor’s value is

A

LESS THAN 100 OHMS

75
Q

When the third band is brown, the resistor’s value is

A

IN HUNDREDS OF OHMS

76
Q

When the third band is red, the resistor’s value is

A

IN THOUSANDS OF OHMS

77
Q

When the third band is orange, the resistor’s value is

A

IN TEN THOUSANDS OF OHMS

78
Q

When the third band is yellow, the resistor’s value is

A

IN HUNDREDS OF THOUSANDS OF OHMS

79
Q

When the third band is green, the resistor’s value is

A

IN MEGOHMS

80
Q

When the third band is blue, the resistor’s value is

A

IN TENS OF MEGOHMS OR MORE

81
Q

When the third band is silver, the resistor’s value is

A

MULTIPLIED BY 0.01

82
Q

When the third band is gold, the resistor’s value is

A

MULTIPLIED BY 0.1

83
Q

If there is no fourth band, the resistor has

A

a 20% tolerance

84
Q

If the fourth band is silver, the resistor has

A

a 10% tolerance

85
Q

If the fourth band is gold, the resistor has

A

a 5% tolerance

86
Q

What does it mean when resistors have a fifth band?

A

These resistors conform to military specifications, which indicates the reliability lever per 1,000 hours of operation

87
Q

If the fifth band is brown, it has

A

a 1% level

88
Q

If the fifth band is red, it has

A

a 0.1% level

89
Q

If the fifth band is orange, it has

A

a 0.01% level

90
Q

If the fifth band is yellow, it has

A

a 0.001% level

91
Q

If the first or second band is black, that number is

A

0

92
Q

If the first or second band is brown, that number is

A

1

93
Q

If the first or second band is red, that number is

A

2

94
Q

If the first or second band is orange, that number is

A

3

95
Q

If the first or second band is yellow, that number is

A

4

96
Q

If the first or second band is green, that number is

A

5

97
Q

If the first or second band is blue, that number is

A

6

98
Q

If the first or second band is violet, that number is

A

7

99
Q

If the first or second band is gray, that number is

A

8

100
Q

If the first or second band is white, that number is

A

9

101
Q

If the fourth band is brown, the resistor has

A

1% tolerance

102
Q

If the fourth band is red, the resistor has

A

2% tolerance

103
Q

What is matter, and in what three states is it found?

A

Anything that occupies space and has weight. Solids, liquids, gases.

104
Q

What is an element?

A

A substance which cannot be reduced to a simpler substance by chemical means.

105
Q

What is a compound?

A

A substance consisting of two or more elements.

106
Q

What is the difference between a compound and a mixture?

A

A compound is a chemical combination of elements that cannot be separated by physical means. A mixture is a physical combination of elements and compounds that are not chemically combined.

107
Q

What is a molecule?

A

A chemical combination of two or more atoms.

108
Q

What are the three types of subatomic particles, and what are their charges?

A

Electrons-negative, protons-positive, and neutrons-neutral

109
Q

What is energy of motion called?

A

Kinetic energy

110
Q

How is invisible light changed to visible light in a fluorescent light?

A

Invisible light photons (ultraviolet) bombard the phosphor atom in the light tube. The phosphor atoms emit visible light photons.

111
Q

What determines the valence of an atom?

A

The number of electrons in the outer shell

112
Q

What is an ion?

A

An atom with more or less than its normal number of electrons

113
Q

What determines whether a substance is a conductor or an insulator?

A

The number of valence electrons

114
Q

How is a negative charge created in a neutral body?

A

Through the accumulation of excess electrons

115
Q

How are static charges created?

A

By friction

116
Q

What is the electrical charge of an atom which contains 8 protons and 11 electrons?

A

Negative

117
Q

What is the relationship between charged bodies?

A

Like charges repel, and unlike charges attract with a force directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

118
Q

What is an electrostatic field?

A

The space between and around charged bodies

119
Q

In what direction are electrostatic lines of force drawn?

A

Leaving positive, entering negative.

120
Q

What are some examples of electrical equipment which use magnetism?

A

Motors, generators, speakers, computers, televisions, tape recorders, and many others.

121
Q

What are magnetic materials?

A

Those materials that are attracted by magnets and have the ability to become magnetized.

122
Q

What characteristics do all ferromagnetic materials have in common?

A

The relative ease with which they are magnetized

123
Q

What type of magnetic material should be used to make a temporary magnet?

A

A material that exhibits low reluctance and high permeability, such as iron or soft steel.

124
Q

What is retentivity?

A

The ability of a material to retain magnetism.

125
Q

How does the law of magnetic poles relate to the law of electric charges?

A

They are very similar; like charges repel, unlike charges attract, like poles repel—unlike poles attract.

126
Q

A compass is located at the geographical North Pole. In which direction would its needle point?

A

To the magnetic north pole.

127
Q

Using Weber’s molecular theory of magnetism, describe the polarity of the magnetic poles produced by stroking a magnetic material from right to left with the south pole of a magnet.

A

South pole at the right, north pole at the left.

128
Q

What is the difference between the domain theory and Weber’s theory of magnetism?

A

The domain theory is based upon the electron spin principle; Weber’s theory uses the concept of tiny molecular magnets.

129
Q

Refer to figure 1-13. For what purpose would you sprinkle iron filings on the glass plate?

A

To enable you to “see” the magnetic field.

130
Q

Refer to figure 1-13. What pattern would be formed if sawdust was sprinkled on the glass instead of iron filings?

A

No specific pattern, sawdust is a nonmagnetic material.

131
Q

What is a magnetic line of force?

A

An imaginary line used to illustrate magnetic effects.

132
Q

In what way do magnetic lines of force differ from electrostatic lines of force?

A

Electrostatic lines of force do not form closed loops.

133
Q

How should a delicate instrument be protected from a magnetic field?

A

By shielding or surrounding the instrument with a soft iron case, called a magnetic shield or screen

134
Q

How should bar magnets be stored?

A

In pairs, with opposite poles together to provide a complete path for magnetic flux.

135
Q

What is the definition of energy?

A

The ability to do work.

136
Q

What type of energy does a rolling stone have?

A

Kinetic energy.

137
Q

What kind of energy does the stone have if it is at rest at the top of a hill?

A

Potential energy.

138
Q

What term describes voltage or emf?

A

Difference of potential.

139
Q

Convert 2.1 kV to volts.

A

2100 volts.

140
Q

Express the following in more simple terms. (a) 250,000 volts, (b) 25,000,000 microvolts, (c) 0.001 millivolt.

A

(a) 250 kV, (b) 25 V, (c) 1 μV.

141
Q

A device which supplies a voltage is commonly referred to by what name?

A

A voltage source.

142
Q

Name the six methods of producing a voltage.

A

Friction, pressure, heat, light, chemical action, and magnetism.

143
Q

The piezoelectric effect is an example of a voltage being produced by what method?

A

Pressure.

144
Q

A thermocouple is a device that produces voltage by what method?

A

Heat.

145
Q

A battery uses what method to produce a voltage?

A

Chemical.

146
Q

A generator uses what method to produce a voltage?

A

Magnetic

147
Q

According to electron theory, an electric current flows from what potential to what potential?

A

Electron theory assumes that electron flow is from negative to positive.

148
Q

The effects of directed drift take place at what rate of speed?

A

The speed of light (186,000 miles per second, 300,000,000 meters per second).

149
Q

What is the relationship of current to voltage in a circuit?

A

Current increases as voltage increases.

150
Q

Convert 350 mA to amperes.

A

0.35 amperes.

151
Q

What is the symbol for ohm?

A

Ω

152
Q

When would silver be used as a conductor in preference to copper?

A

When the need for conductivity is great enough to justify the additional expense.

153
Q

Which wire has the least resistance? Wire A-copper, 1000 circular mils, 6 inches long. Wire B-copper, 2000 circular mils, 11 inches long.

A

Wire B.

154
Q

Which temperature coefficient indicates a material whose resistance increases as temperature increases?

A

Positive.

155
Q

What term describes a material whose resistance remains relatively constant with changes in temperature?

A

Zero temperature coefficient.

156
Q

What is the unit of conductance and what other term is sometimes used?

A

The mho (v), siemens.

157
Q

What is the relationship between conductance and resistance?

A

They are reciprocals of each other.

158
Q

What is schematic symbol for a resistor?

A

JAGGED LINE

159
Q

What does the wattage rating of a resistor indicate?

A

Its ability to dissipate heat.

160
Q

What are the two disadvantages of carbon-type resistors?

A
  1. Change value with age. 2. Limited power capacity.
161
Q

What type resistor should be used to overcome the disadvantages of the carbon resistor?

A

The wirewound resistor.

162
Q

Describe the differences between the rheostat connections and those of the potentiometer.

A

The rheostat may have two connections, one fixed and one moveable; the potentiometer always has three connections, one moveable and two fixed.

163
Q

Which type of variable resistor should you select for controlling a large amount of current?

A

The rheostat.

164
Q

A carbon resistor has a resistance of 50 ohms, and a tolerance of 5 percent. What are the colors of bands one, two, three, and four, respectively?

A

The bands are green, black, black, and gold.

165
Q

A carbon resistor has the following color bands: The first band is yellow, followed by violet, yellow, and silver. What is the ohmic value of the resistor?

A

470,000 ohms (470 kilohms).

166
Q

The same resistor mentioned in question 63 has a yellow fifth band. What does this signify?

A

The resistor’s chance of failure is 0.001 percent for 1000 hours of operation.

167
Q

A resistor is handed to you for identification with the following color code: the first band is blue, followed by gray, green, gold, and brown. What is the resistor’s value?

A

6,800,000 ohms (6.8 megohms), with 5% tolerance, and a 1% reliability level.

"CE" E6 REGULAR EXAM SEP 2014 (9 decks)

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