3E052 Volume 2 URE
What alternating current (AC) characteristic causes an opposition to any CHANGE in the value of voltage?
Capacitance
What symbol do we commonly use to represent resistance?
Greek letter Omega.
Which electrical malfunction has the same symptoms as a direct short?
Ground
Which alternator component helps the generator maintain a stable voltage under varying load conditions?
Damping Windings
Which alternator configuration has no neutral that is common to all three phases?
Delta
What is the insulating material called that separates the two plates of conductive material in a capacitor?
Dielectric
A good example of a use for a variable resistor is a
Dimmer switch for a light
What type of voltage normally maintains the same magnitude, but may vary?
Direct Current
Which electrical malfunction do positive and negative conductors making direct contact cause?
Direct Short
What is the first step you take when replacing a battery?
Disconnect negative terminal
Visually check the electrolyte level in each cell of a battery. If the level is low, fill the cell to the proper level using
Distilled water
In what type of weather can a static charge can be most hazardous?
Dry, Cold Weather
Which mnemonic spells out the phase shift in an alternating current (AC) circuit?
ELI the ICEman
How much resistance does a diode offer to the current flow when the power source connects in the forward bias direction?
Low
What is the primary reason for engines failing to start?
Low battery voltage
What is the bias of a diode when we connect the positive terminal of the battery to the Ptype material and the negative terminal of the battery to the N-type material?
Forward
Which type of circuit breaker responds instantaneously when an excess of current flows through the breaker?
Magnetic
The specific gravity of battery electrolyte changes by...
.004 for every 10 degrees in temperature change
When you hear about the frequency of electricity, it refers to the number of complete cycles that occur in
1 second
How many free electrons do conductors have in the valence shell?
1 to 3
At what voltage can static charges ignite gasoline fumes?
1,500
What is the specific gravity of a fully charged lead-acid cell at 80 degrees?
1.280
What is the multiplier you use to determine the line voltage if you know the phase voltage?
1.73
Typical electrical system engines use what voltage batteries to provide power to start and operate the engine?
12 or 24
In an alternating current (AC) voltage signal, how many peaks does each cycle have?
2
Semiconductors are not good conductors or insulators and are made of substances that have how many free electrons?
4
In contrast to good conductors, we consider substances that have how many free electrons to be insulators?
5 to 8
How many diodes are used in the rectifier of a battery-charging alternator?
6
What type of voltage continually changes magnitude and occasionally changes direction?
Alternating Current
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 the voltage level.
What type of circuit typically has a parallel circuit with one or more legs having series portions?
Combination circuit
Which diagram provides complete wire numbers, plug and jack pin numbers, and cannon plug numbers required to completely extract and troubleshoot specific circuits?
Connection
Which diagram shows the connection of an installation or its component devices and equipment?
Connection
What do we call the induced voltage that moves in the opposite direction as the applied voltage in an inductor?
Counter electromotive force
What type of transformer only uses a secondary coil?
Current
On the power factor meter, what will an inductive load cause?
Current to lag voltage
What is the purest part of a substance that can be broken down and retains its properties as that element?
Element
What automatic transfer switch adjustment could be set to zero if the generator has a builtin shutdown timer?
Engine shutdown delay
When replacing a battery, which step helps prevent corrosion?
Ensure battery terminals are seated and tightened
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
What diagram should include all wire numbers, device code numbers, and area designations?
Extraction
In addition to elbow length rubber gloves and a rubber apron, what other safety equipment must you wear when working on batteries?
Face shield
When it comes to resistance in a piece of wire, what does a smaller surface area cause?
Higher Resistance
In reference to reverse bias, what happens when the majority carriers move outward allowing the barrier voltage to increase?
Increase the depletion region
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.
What alternating current (AC) characteristic causes an opposition to any CHANGE in current flow?
Inductance
Which alternator component offers a slight magnetic force that aligns the main magnetic field so it remains most effective?
Interpoles
What is the relationship of current based on Ohm's Law?
Inversely proportional to voltage and directly proportional to resistance.
Everything in the universe is made up of...
Matter
Since most of the capacitors you will see have a rating much lower than one farad, what do we refer to these as, represented by μf?
Microfarad
What is the smallest unit a compound can be broken down into without changing characteristics of the compound?
Molecule
Which test instrument do you use when testing the main rotor leads?
Multimeter set to Ohms
This is a placeholder. The answer is "N/A"
N/A
What are the four basic types of wiring diagrams used in the power production field?
One-Line, Schematic, Connection, and Interconnection diagrams
What do dot-dash lines mean on an interconnection diagram?
Outline the panel sections
What is the first step in the troubleshooting process?
Perform an Operational check
What method of calculating total resistance of a parallel circuit only works when calculating two resistors?
Product over Sum method
What are the three parts of an atom?
Proton, Neutron and Electron
What do we call the power created by inductance or capacitance?
Reactive power
Which meter indicates the true power load in an alternating current (AC) circuit?
Wattmeter
Which alternator configuration has three legs that all connect in the middle?
Wye
When conducting a visual inspection of an automatic transfer switch, what should you do if you find a problem with a component?
Replace it immediately
What is the small amount of magnetism that remains in an item after removing the magnetic field?
Residual magnetism
What component does a magnetic field have little to no influence on?
Resistors
What devices provide variable amounts of resistance to provide a circuit with different levels of output?
Rheostats
Which diagram is the most important of all diagrams because it is your guide through the connection diagram?
Schematic
Which component is used with a voltmeter for a three-phase alternator to save money?
Selector Switch
Which direct current (DC) circuits have only one path for electron flow?
Series
What type of direct current (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
In a rotating rectifier test, what does it indicate if a diode has a low reading in both directions?
Shorted
Which electrical malfunction is caused by the contacts of a switch or relay being welded closed?
Shorted Control
Which type of alternator consists of a rotating magnetic field and a single set of stator coils?
Single Phase
What type of cores do most exciters use that retain residual magnetism?
Soft iron
Which relay component is completely self-contained and has no moving parts?
Solid State
What causes the crank relay coil to de-energize causing the starter solenoid to de-energize?
Speed Switch opening
Which electrical system component performs two functions--one mechanical and one electrical?
Starter Solenoid
Which component is the stationary conductor on the battery-charging alternator?
Stator
If the secondary coil of a transformer has less coil turns, what does the transformer do to meet circuit needs?
Steps the voltage down
If the secondary coil of a transformer has more coil turns, what does the transformer do to meet circuit needs?
Steps the voltage up
What is the characteristic for total power in a series parallel circuit?
Sum of the power at each individual resistor
What device allows you to control a direct current (DC) circuit manually?
Switch
Before making a ground connection to a water pipe, check for the
presence of electric current
You will bond the the generator's neutral and ground if you are providing
prime power generation and a standby generator with a switch neutral
The purpose of bonding the generators neutral and ground is to
provide a path for electricity to ground in case of a fault.
Which relay component provides a constant restraining force keeping the armature in the normal (deenergized) position?
spring
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 function do equipment grounds serve?
To connect all noncurrent carrying metal parts of an electrical system to ground
What function does a static ground serve?
To dissipate or reduce unwanted electrical charges in hazardous areas to ground
Which automatic transfer switch control sends a signal to transfer the load to generator power?
Transfer control
What component may increase or decrease voltage in a circuit?
Transformer
Ohm's Law describes the relationship between
Voltage, Current and Resistance
Which ohmmeter reading indicates that a fuse is good and no further testing is necessary?
Zero
One indication that a direct current (DC) charging system is not working correctly is the...
ammeter is reading in a discharged state
Where does a magnet have the greatest amount of magnetism?
at the end of each magnet
If you adjust a battery-charging alternator too high, the...
battery will be damaged
If you adjust a battery charging alternator too low, the...
battery won't fully charge
Where should you look for any signs of rubbing on an exciter?
between the rotor and stator
It is important to use straight conductors when installing grounds because a curved conductor
can cause inductance
The closing assembly of a circuit breaker usually consists of
closing coil or motor and a control switch
When you inspect the voltage regulator vibration dampeners, look for
cracking and deterioration