Power Pro Book 2 Flashcards by Aaron Dana

Everything in the universe is made up of?

Matter

How well did you know this?

Not at all

Perfectly

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

Molecule

How well did you know this?

Not at all

Perfectly

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

element

How well did you know this?

Not at all

Perfectly

What are the three parts of an atom?

Proton, Neutron and electron.

How well did you know this?

Not at all

Perfectly

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

1 to 3

How well did you know this?

Not at all

Perfectly

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

Between 5 to 8

How well did you know this?

Not at all

Perfectly

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

How well did you know this?

Not at all

Perfectly

What symbol do we commonly use to represent restistance?

Greek letter Omega (Ohm)

How well did you know this?

Not at all

Perfectly

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

Higher Resistance

How well did you know this?

Not at all

Perfectly

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

DC, Direct Current

How well did you know this?

Not at all

Perfectly

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

AC, Alternating Current

How well did you know this?

Not at all

Perfectly

Ohm’s Law describes the relationship between?

Voltage, Current and resistance

How well did you know this?

Not at all

Perfectly

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

Inversely proportional to voltage and directly proportional to resistance

How well did you know this?

Not at all

Perfectly

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

Switch

How well did you know this?

Not at all

Perfectly

Which DC circuits have only one path for electron flow?

Series

How well did you know this?

Not at all

Perfectly

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

Product over sum method

How well did you know this?

Not at all

Perfectly

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?

Series-Parallel circuit

How well did you know this?

Not at all

Perfectly

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

Sum of the power at each individual resistor.

How well did you know this?

Not at all

Perfectly

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

Combination circuit

How well did you know this?

Not at all

Perfectly

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

1 second

How well did you know this?

Not at all

Perfectly

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

How well did you know this?

Not at all

Perfectly

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

Resistors

How well did you know this?

Not at all

Perfectly

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

Dimmer switch for a light.

How well did you know this?

Not at all

Perfectly

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

Counter electromotive force. (EMF)

How well did you know this?

Not at all

Perfectly

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

Inductance

What component may increase or decrease voltage in a circuit?

Transformer

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

Steps the voltage level down

What type of transformer only uses a secondary coil?

Potential

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

Steps voltage up

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

Dielectric

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

Reactance

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

Microfarad

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

ELI the ICEman

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

Reactive power

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?

Forward Bias

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

Low

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

Increase in the depletion region

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

One-line, schematic, connection and interconnection diagram

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

Connection

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

Connection

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

Outline the panel sections

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

An extraction

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

Schematic

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

12 or 24

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

Starter solenoid

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

Stator

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

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

Speed switch opening

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

To avoid damage to the battery and other electrical components

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

battery will be damaged

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

Battery will not reach full charge

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

1.280

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

Face-shield

what is the specific gravity of battery electrolyte changes?

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

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

Distilled water

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

Disconnect the negative terminal

When replacing a battery, which step helps prevent corrosion?

Ensure battery terminals are seated and tightened

What is the first step in the troubleshooting process?

Perform ops check

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

Direct short

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

Shorted control

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

Ground

What is the primary reason for engines failing to start?

Low battery voltage

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

Ammeter is reading in a discharged state.

Where does a magnet have the greatest amount of magnetism?

At each end of the magnet. (Both poles)

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

Residual

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

Interpoles

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

Damping windings.

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

Soft Iron

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

An increase in voltage level.

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

Single phase

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

Wye

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

1.73

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

Delta

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

Shorted

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

Multimeter set to ohms

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

Selector Switch

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

Wattmeter

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

Current to lag voltage

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

Rheostats

When you inspect the voltage regulator vibration dampeners, look for

Cracking and deterioration

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

Between the rotor and stator

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

Dark gray or black

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

Magnetic

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

Spring

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

Solid-state

The closing assembly of a circuit breaker usually consists of

Closing coil/motor and control switch

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

zero

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

Dry, Cold weather

At what voltage can static charges ignite gasoline fumes?

1,500

What function do static grounds serve?

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

What function do equipment grounds serve?

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

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

Increase the number of conductors while keeping their lengths short

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

Can cause inductance

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

Presence of electric current

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

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

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

Prime power generation and a standby generator with a switch neutral

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

Transfer control

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

Replace it immediately

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

Engine shutdown delay

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

Ensuring phase rotation is correct and all connections are tight.