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Red Horse > Power Pro Book 2 > Flashcards

Power Pro Book 2 Flashcards

1
Q

Everything in the universe is made up of?

A

Matter

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2
Q

What is the smallest unit a compound can be broken down into without changing characteristics of the compound?

A

Molecule

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3
Q

What is the purest part of a substance that can be broken down and retains its properties as that element?

A

element

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4
Q

What are the three parts of an atom?

A

Proton, Neutron and electron.

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5
Q

How many free electrons do conductors have in the valence shell?

A

1 to 3

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6
Q

In contrast to good conductors, we consider substances that have how many free electrons be insulators?

A

Between 5 to 8

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7
Q

Semiconductors are not good conductors or insulators and are made of substances that have how many free electrons?

A

4

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8
Q

What symbol do we commonly use to represent restistance?

A

Greek letter Omega (Ohm)

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9
Q

When it comes to resistance in a piece of wire, what does the smaller surface area cause?

A

Higher Resistance

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10
Q

What type of voltage normally maintains the same magnitude, but may vary?

A

DC, Direct Current

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11
Q

What type of voltage continually changes magnitude and occasionally changes direction?

A

AC, Alternating Current

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12
Q

Ohm’s Law describes the relationship between?

A

Voltage, Current and resistance

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13
Q

What is the relationship of current based on Ohm’s Law?

A

Inversely proportional to voltage and directly proportional to resistance

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14
Q

What device allows you to control a direct DC circuit manually?

A

Switch

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15
Q

Which DC circuits have only one path for electron flow?

A

Series

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16
Q

*****What method of calculating total resistance of a parallel circuit only works when calculating two resistors?

A

Product over sum method

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17
Q

What type of DC circuit has more than one path for current to flow but have at least one resistor that receives the total circuit current passing through it?

A

Series-Parallel circuit

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18
Q

What is the characteristic for total power in a series parallel circuit?

A

Sum of the power at each individual resistor.

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19
Q

What type of circuit typically has a parallel circuit with one or more legs having series portions?

A

Combination circuit

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20
Q

When you hear about the frequency of electricity, it refers to the number of complete cycles that occur in?

A

1 second

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21
Q

In an AC voltage signal, how many peaks does each cycle have?

A

2

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22
Q

What component does a magnetic field have little to no influence on?

A

Resistors

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23
Q

A good example of a use for a variable resistor is a?

A

Dimmer switch for a light.

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24
Q

What do we call the induced voltage that moves in the opposite direction as the applied voltage in an inductor?

A

Counter electromotive force. (EMF)

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25
Q

What AC characteristic causes an opposition to any change in current flow?

A

Inductance

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26
Q

What component may increase or decrease voltage in a circuit?

A

Transformer

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27
Q

If the secondary coil of a transformer has less coil turns, what does the transformer do to meet circuit needs?

A

Steps the voltage level down

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28
Q

What type of transformer only uses a secondary coil?

A

Potential

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29
Q

If the secondary coil of a transformer has more coil turns what does the transformer do to meet circuit needs?

A

Steps voltage up

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30
Q

What is the insulating material called that separate the two plates of conductive material in a capacitor?

A

Dielectric

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31
Q

What AC characteristic causes an opposition to any change in value of voltage?

A

Reactance

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32
Q

Since most of the capacitors you will see have a rating much lower that one farad, what do we refer to these as, represented by µF

A

Microfarad

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33
Q

Which mnemonic spells out the phase shift in an AC circuit?

A

ELI the ICEman

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34
Q

What do we call the power created by inductance or capacitance?

A

Reactive power

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35
Q

What is the bias of a diode when we connect the positive terminal of the battery to the P-type material and the negative terminal of the battery to the N-type material?

A

Forward Bias

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36
Q

How much resistance does a diode offer to the current flow when the power source connects in the forward bias direction?

A

Low

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37
Q

In reference to reverse bias, what happens when the majority carriers move outward allowing the barrier voltage to increase?

A

Increase in the depletion region

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38
Q

What are the four basic types of wiring diagrams used in the power production field?

A

One-line, schematic, connection and interconnection diagram

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39
Q

Which diagram shows the connection of an installation or its component devices and equipment?

A

Connection

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40
Q

Which diagram provides complete wire numbers, plug and jack pin umbers, and cannon plug numbers required to completely extract and troubleshoot specific circuits.

A

Connection

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41
Q

What do dot-dash lines mean on an interconnection diagram?

A

Outline the panel sections

42
Q

What diagram should include all wire numbers, device code numbers, and area desigations?

A

An extraction

43
Q

Which diagram is the most important of all diagrams because it is your guide through the connection diagram?

A

Schematic

44
Q

Typical electrical system engines use what voltage batteries to provide power to start and operate the engine?

A

12 or 24

45
Q

Which electrical system component performs two functions-one mechanical and one electrical?

A

Starter solenoid

46
Q

Which component is stationary conductor on the battery-charging alternator?

A

Stator

47
Q

How many diodes are used in the rectifier of a battery-charging alternator?

A

6

48
Q

What causes the crank relay coil to de-energize causing the starter solenoid to de-energize?

A

Speed switch opening

49
Q

Why do you make sure to reconnect the electrical leads to the appropriate lugs to match the polarity of the battery?

A

To avoid damage to the battery and other electrical components

50
Q

What will happen if you adjust a battery-charging alternator too high?

A

battery will be damaged

51
Q

What will happen if you adjust a battery charging alternator too low?

A

Battery will not reach full charge

52
Q

What is the specific gravity of a fully charged lead-acid cell at 80 degrees?

A

1.280

53
Q

In addition to elbow length rubber gloves and a rubber apron, what other safety equipment must you wear when working on batteries?

A

Face-shield

54
Q

what is the specific gravity of battery electrolyte changes?

A

+/- .004 for every 10 degrees in temperature change

55
Q

Visually check the electrolyte level in each cell of a battery. If the level is low, fill the cell to proper level using

A

Distilled water

56
Q

What is the first step you take when replacing a battery?

A

Disconnect the negative terminal

57
Q

When replacing a battery, which step helps prevent corrosion?

A

Ensure battery terminals are seated and tightened

58
Q

What is the first step in the troubleshooting process?

A

Perform ops check

59
Q

Which electrical malfunction do positive and negative conductors making direct contact cause?

A

Direct short

60
Q

Which electrical malfunction is caused by the contacts of a switch or relay being welded closed?

A

Shorted control

61
Q

Which electrical malfunction has the same symptoms as a direct short?

A

Ground

62
Q

What is the primary reason for engines failing to start?

A

Low battery voltage

63
Q

One indication that a DC charging system is not working correctly is the battery-charging.

A

Ammeter is reading in a discharged state.

64
Q

Where does a magnet have the greatest amount of magnetism?

A

At each end of the magnet. (Both poles)

65
Q

What is the small amount of magnetism that remains in an item after removing the magnetic field?

A

Residual

66
Q

Which alternator component offers a slight magnetic force that aligns the main magnetic field so it remains most effective?

A

Interpoles

67
Q

Which alternator component helps the generator maintain a stable voltage under varying load conditions?

A

Damping windings.

68
Q

What type of cores do most exciters use that retain residual magnetism?

A

Soft Iron

69
Q

What does a voltage regulator sense if it decreases the current to the exciter field windings causing the magnetic field to get weaker?

A

An increase in voltage level.

70
Q

Which type of alternator consists of rotating magnetic field and single set of stator coils?

A

Single phase

71
Q

Which alternator configuration has three legs that all connect in the middle?

A

Wye

72
Q

What is the multiplier you use to determine the line voltage if you know the phase voltage?

A

1.73

73
Q

Which alternator configuration has no neutral that is common to all three phases?

A

Delta

74
Q

In a rotating rectifier test, what does it indicate if a diode has a low reading in both directions?

A

Shorted

75
Q

Which test instrument do you use when testing the main rotor leads?

A

Multimeter set to ohms

76
Q

Which component is used with a voltmeter for a three-phase alternator to save money?

A

Selector Switch

77
Q

Which meter indicates the true power load in an AC circuit?

A

Wattmeter

78
Q

On the power factor meter, what will an inductive load cause?

A

Current to lag voltage

79
Q

What devices provide variable amounts of resistance to provide a circuit with different levels of output?

A

Rheostats

80
Q

When you inspect the voltage regulator vibration dampeners, look for

A

Cracking and deterioration

81
Q

Where should you look for any sings of rubbing on an exciter?

A

Between the rotor and stator

82
Q

What color will a transformer turn if it gets too hot?

A

Dark gray or black

83
Q

Which type of circuit breaker responds instantaneously when an excess of current flows through the breaker?

A

Magnetic

84
Q

Which relay component provides a constant restraining force keeping the armature in the normal, (deenergized) position?

A

Spring

85
Q

Which relay component is completely self-contained and has no moving parts?

A

Solid-state

86
Q

The closing assembly of a circuit breaker usually consists of

A

Closing coil/motor and control switch

87
Q

Which ohmmeter reading indicates that fuse is good and no further testing is necessary?

A

zero

88
Q

In what type of weather can a static charge can be most hazardous?

A

Dry, Cold weather

89
Q

At what voltage can static charges ignite gasoline fumes?

A

1,500

90
Q

What function do static grounds serve?

A

To dissipate or reduce unwanted electrical charges in hazardous areas to ground

91
Q

What function do equipment grounds serve?

A

To connect all noncurrent carrying metal parts of an electrical system to ground.

92
Q

When installing a star ground, what is the best approach to lower resistance and reactance at the same time?

A

Increase the number of conductors while keeping their lengths short

93
Q

Why is it important to use straight conductors when installing rounds because a curved conductor?

A

Can cause inductance

94
Q

Before making a ground connection to a water pipe, check for the

A

Presence of electric current

95
Q

The purpose of bonding the generators neutral and ground is to,

A

provide a path for electricity to ground in the event of a fault

96
Q

You will bond the generator’s neutral and ground if you are providing-

A

Prime power generation and a standby generator with a switch neutral

97
Q

Which automatic transfer switch control sends a signal to transfer the load to generator power?

A

Transfer control

98
Q

When conducting a visual inspection of an automatic transfer switch, what should you do if you find problem with a component

A

Replace it immediately

99
Q

What automatic transfer switch adjustment could be set to zero if the generator has a built-in shutdown timer?

A

Engine shutdown delay

100
Q

When installing an automatic transfer panel, what do you have to ensure when double-checking your work?

A

Ensuring phase rotation is correct and all connections are tight.

Red Horse (4 decks)

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