11394041
Descripción
Test por Kris Salmons, actualizado hace más de 1 año
|
Creado por Kris Salmons
hace más de 6 años
|
|
Pregunta 1
Pregunta
The most commonly accepted theory regarding electricity says that an electric current is a flow of ____________________ through a conductor.
Respuesta
-
Primordial aether
-
Neutrinos
-
Electrons
-
Protons
Pregunta 2
Pregunta
In the realm of electricity - as is also the case in pneumatics and hydraulics - current moves from a location of ____________ pressure to an area of ____________ pressure.
Respuesta
-
low; high
-
high; low
-
negative; positive
-
equivalent; high
Pregunta 3
Pregunta
The name of the unit we use to describe our body weight is the pound. Likewise, the name of the unit we use to describe electrical pressure is the ____________.
Respuesta
-
amp
-
volt
-
ohm
-
watt
Pregunta 4
Pregunta
The name of the unit we use to describe electrical current is the ____________.
Respuesta
-
amp
-
volt
-
ohm
-
watt
Pregunta 5
Pregunta
The name of the unit we use to describe resistance against the flow of electrical current is the ____________.
Respuesta
-
amp
-
volt
-
ohm
-
watt
Pregunta 6
Pregunta
All materials give at least some amount of resistance to the flow of electricity. However, the resistance given by some metals is very small and we say these metals are good ____________.
Respuesta
-
insulators
-
semiconductors
-
conductors
-
heaters
Pregunta 7
Pregunta
There is a mathematical relationship between the voltage, current, and resistance in an electrical circuit. We express this relationship with the equation E = I x R. This relationship is called ____________ Law.
Respuesta
-
Lenz's
-
Ohm's
-
Tesla's
-
Watt's
Pregunta 8
Pregunta
When a large number of free electrons collect on a piece of non-conductive material, creating an electric field which might attract hair and small bits of paper, we call this an example of ____________ electricity.
Respuesta
-
static
-
current
-
neutral
-
kinetic
Pregunta 9
Pregunta
One pole of a small, permanent bar magnet, if it is left free to move, will point toward the north geographic pole of the earth. Which magnetic pole of the small magnet points to the earth's geographic north pole?
Respuesta
-
North
-
South
-
East
-
West
Pregunta 10
Pregunta
Magnets have two poles, named north and south. Lines of magnetic flux connect these two poles, moving from one to the other and creating what we call a magnetic field. Outside of the magnet, we say that the lines of force move from ____________ to ____________.
Respuesta
-
south; north
-
north; south
-
south; south
-
north; north
Pregunta 11
Pregunta
If two magnets are brought near to one another, with the ____________ poles facing each other, then the magnets will be attracted to one another.
Respuesta
-
like
-
unlike
-
center
-
same
Pregunta 12
Pregunta
If two magnets are brought near to one another, with the ____________ poles facing each other, then the magnets will be repelled from one another.
Respuesta
-
like
-
unlike
-
center
-
opposite
Pregunta 13
Pregunta
When a wire is forced to move through a magnetic field, what is created in the wire?
Respuesta
-
electric current
-
light
-
aetheric vapors
-
matter
Pregunta 14
Pregunta
When electricity is forced to flow through a wire, what is created in the space around the wire?
Respuesta
-
light
-
aetheric vapors
-
a magnetic field
-
matter
Pregunta 15
Pregunta
Michael Faraday is considered one of the most important pioneers in the development of electric generators and motors. One of his most significant contributions was the development of sliding electrical contacts which are called ____________.
Respuesta
-
rollers
-
brushes
-
sliders
-
tectonic plates
Pregunta 16
Pregunta
When the number 1200 is written in the form 1.2 x 10^3 it still equals the same quantity; and this new form of notation is referred to as "____________ notation."
Respuesta
-
abbreviated
-
engineering
-
short hand
-
imperial
Pregunta 17
Pregunta
Insert the correct prefix (modifier...single-letter initial) to make this statement true: 1,500,000 V = 1.5 ___V.
Respuesta
-
m
-
k
-
M
-
G
Pregunta 18
Pregunta
Insert the correct prefix (modifier...single-letter initial) to make this statement true: 0.003 A = 3.0 ___A.
Respuesta
-
m
-
k
-
M
-
G
Pregunta 19
Pregunta
Insert the correct prefix (modifier...single-letter initial) to make this statement true: 2,200 Ω = 2.2 _____Ω.
Respuesta
-
m
-
k
-
M
-
G
Pregunta 20
Pregunta
Name the unit we use to describe electrical "power."
Respuesta
-
Coulomb
-
Steinmetz
-
Watts
-
Ohms
Pregunta 21
Pregunta
Name the unit we use to describe electrical "energy."
Respuesta
-
Watt-hour
-
Watt-second
-
Amp-hour
-
Volt-amps
Pregunta 22
Pregunta
Semiconductors have 4 valence electrons in their outer shell. Conductors generally have ________________ 4 valence electrons in their outer shell.
Respuesta
-
more than
-
fewer than
-
equal to
-
none of the above
Pregunta 23
Pregunta
Insulators are graded by their "dielectric strength," measured in volts per mil. This means that a dielectric with a V/mil of 500, and a thickness of 1 mil, can stand up to 500 volts of electrical pressure trying to force electrons to flow through it. The oxidized form of one very common conductor has an extremely high dielectric strength of 20,000 V/mil. This very non-conductive metal oxide is ________________ oxide.
Respuesta
-
silver
-
copper
-
aluminum
-
iron
Pregunta 24
Pregunta
How does the resistance of a wire change as the wire is made longer?
Respuesta
-
Resistance goes up.
-
Resistance goes down.
-
It doesn't change at all.
-
Cannot tell from the information given.
Pregunta 25
Pregunta
One of the most common forms of low-power fixed resistors is comprised of a conductive paste, coating a small ceramic tube, with metal end-caps and leads. This is called the ________________ film resistor.
Respuesta
-
metal
-
silicon
-
carbon
-
aluminum
Pregunta 26
Pregunta
Most variable resistors have 3 leads: one lead from each end of the main resistor element and one lead from the movable conductor, called the wiper. There are 2 standard ways to wire a variable resistor into a circuit. One way involves tying the wiper lead to one of the end-leads. thus turning the variable resistor into a 2-lead component. This style is called a ________________ and it is used primarily for controlling electric current.
Respuesta
-
potentiometer
-
rheostat
-
inductor
-
switch
Pregunta 27
Pregunta
Most variable resistors have 3 leads: one lead from each end of the main resistor element and one lead from the movable conductor, called the wiper. There are 2 standard ways to wire a variable resistor into a circuit. One way leaves it in the circuit as a 3-lead component, used primarily for controlling voltage. This style of variable resistor is called a ________________.
Respuesta
-
potentiometer
-
rheostat
-
inductor
-
switch
Pregunta 28
Pregunta
Name the component represented by this schematic symbol.
Respuesta
-
ground
-
battery
-
fuse
-
resistor
Pregunta 29
Pregunta
Name the component represented by this schematic symbol.
Respuesta
-
ground
-
battery
-
fuse
-
resistor
Pregunta 30
Pregunta
A network of components and conductors arranged and interconnected to allow a controlled flow of electric current from the positive side of a voltage source, through a load, and back to the negative side of the source is called an electric ________________.
Respuesta
-
maze
-
circuit
-
web
-
thread
Pregunta 31
Pregunta
Blue [blank_start]________________[blank_end]
Yellow [blank_start]________________[blank_end]
White [blank_start]________________[blank_end]
Orange [blank_start]________________[blank_end]
Brown [blank_start]________________[blank_end]
Violet [blank_start]________________[blank_end]
Black [blank_start]________________[blank_end]
Green [blank_start]________________[blank_end]
Gray [blank_start]________________[blank_end]
Red [blank_start]________________[blank_end]
Respuesta
-
6 (six)
-
4 (four)
-
9 (nine)
-
3 (three)
-
1 (one)
-
7 (seven)
-
0 (zero)
-
5 (five)
-
8 (eight)
-
2 (two)
Pregunta 32
Pregunta
Ohm's Law is: ________________ = ________________ x ________________
Respuesta
-
I = R x E
-
R = E x I
-
I = E x R
-
E = I x R
Pregunta 33
Pregunta
Using the series circuit shown, if V = 10V and R = 100Ω, how much current is flowing through the circuit?
Respuesta
-
10.0 A
-
.001 A
-
.100 A
-
100 A
Pregunta 34
Pregunta
Using the series circuit shown, if R = 10Ω and I = 0.1A, what is the value for the supply voltage?
Respuesta
-
1.0V
-
0.1V
-
10V
-
0.01V
Pregunta 35
Pregunta
Using the series circuit shown, if V = 100V and I = 0.1A, what is the total resistance?
Respuesta
-
10Ω
-
100Ω
-
1,000Ω
-
10,000Ω
Pregunta 36
Pregunta
When a meter is placed into a circuit to take measurements, it always draws off some amount of current, be it ever so small. This impact that a meter has on a circuit is referred to as meter _________________.
Respuesta
-
loading
-
mistake
-
unloading
-
parallax
Pregunta 37
Pregunta
In the series circuit shown, which meter is correctly positioned for measuring voltage?
Image:
Q38 39 (binary/octet-stream)
Respuesta
-
Meter 1
-
Meter 2
Pregunta 38
Pregunta
In the series circuit shown, which meter is correctly installed for measuring current?
Image:
Q38 39 (binary/octet-stream)
Respuesta
-
Meter 1
-
Meter 2
Pregunta 39
Pregunta
The most used "reference" point when measuring voltages in electrical and electronic circuits is also an electrically "common" point in the circuit that is generally tied to one side of the voltage source. This point is commonly called __________________.
Respuesta
-
source
-
ground
-
test
-
hot
Pregunta 40
Pregunta
20 kΩ equal ___________.
Respuesta
-
2,000Ω
-
20,000Ω
-
200,000Ω
-
2,000,000Ω
Pregunta 41
Pregunta
Energy that is being stored for possible use is technically or scientifically known as ________________ energy.
Respuesta
-
potential
-
quantum
-
kinetic
-
static
Pregunta 42
Pregunta
Energy that is in motion, performing work in the moment is technically or scientifically known as _____________________ energy.
Respuesta
-
quantum
-
potential
-
kinetic
-
static
Pregunta 43
Pregunta
1 Watt = 1 Volt x 1 ___________
Respuesta
-
Hour
-
Amp
-
Ohm
-
Farad
Pregunta 44
Pregunta
In electricity, power may be calculated as Watts = I^2 x _________.
Respuesta
-
V
-
R
-
P
-
A
Pregunta 45
Pregunta
In a circuit with a source voltage of 120V, the voltage drop across a short circuit equals __________.
Respuesta
-
120V
-
0V
-
infinite volts
-
unknown
Pregunta 46
Pregunta
1 HP = about 750 _____________.
Respuesta
-
Amps
-
Watts
-
Ohms
-
Volts
Pregunta 47
Pregunta
In a circuit with a source voltage of 120V, the voltage drop across an open circuit equals ____________.
Respuesta
-
120V
-
0V
-
infinite volts
-
unknown
Pregunta 48
Pregunta
A series circuit has ______________ path(s) for current to follow.
Respuesta
-
no
-
one
-
multiple
-
variable
Pregunta 49
Pregunta
If current is measured in two different parts of a series circuit, the two measurements will be __________________.
Respuesta
-
the same
-
proportional to the resistors
-
slightly different
-
unknown
Pregunta 50
Pregunta
In a series circuit, consisting of one voltage source and three resistors, the sum of all the voltage drops across the three resistors will be equal to _________________.
Respuesta
-
100 volts
-
the source voltage
-
a single resistor's ohms
-
unknown
Pregunta 51
Pregunta
In a series circuit, consisting of one voltage source and three resistors, if the resistance of one of the resistors is increased the voltage drop across it will ____________________________.
Respuesta
-
also increase
-
decrease
-
remain the same
-
change unpredictably
Pregunta 52
Pregunta
In a series circuit consisting of one voltage source and two resistors, if the values of the resistors are equal we can assume that their voltage drops will be __________________.
Respuesta
-
equal to each other
-
greater than the total supply voltage
-
higher across the first resistor
-
higher across the second resistor
Pregunta 53
Pregunta
How much current is flowing through the series circuit shown?
Respuesta
-
0.5mA
-
5.0mA
-
5.0µA
-
5.0A
Pregunta 54
Pregunta
What is the voltage drop across the 5kΩ resistor in the series circuit shown?
Respuesta
-
12V
-
25V
-
2.5V
-
0.5V
Pregunta 55
Pregunta
What is the voltage of the second battery in the series circuit shown?
Image:
Q58 59 (binary/octet-stream)
Respuesta
-
12V
-
20V
-
24V
-
36V
Pregunta 56
Pregunta
How much current is flowing in the series circuit shown?
Image:
Q58 59 (binary/octet-stream)
Respuesta
-
6A
-
6mA
-
6µA
-
none of these
Pregunta 57
Pregunta
In the series circuit shown, if V = 24V, I = 2.4mA, and R1 = 3.5kΩ what is the value of R2?
Respuesta
-
10kΩ
-
6.5kΩ
-
6.5Ω
-
10Ω
Pregunta 58
Pregunta
In a parallel resistor circuit, the voltage drop is ________________________ across all the resistors in the parallel network.
Respuesta
-
equal
-
divided proportionally according to the resistor value
-
unpredictable
Pregunta 59
Pregunta
In a parallel resistor circuit, if all the resistors are of the same value the current is __________________ through each of the resistors.
Respuesta
-
the same
-
greater through the first branch resistor
-
greater through the second branch resistor
-
undeterminable
Pregunta 60
Pregunta
In a parallel resistor circuit, if all the resistors are of different values the branch with the smallest resistor value will have the _________________ current flow.
Respuesta
-
greatest
-
least
-
same
-
uncalculable
Pregunta 61
Pregunta
Total resistance in a parallel circuit is always _______________ the smallest resistor value.
Respuesta
-
greater than
-
less than
-
equal to
-
unrelated to
Pregunta 62
Pregunta
Two 100Ω resistors are connected in parallel. What is their combined resistance?
Respuesta
-
50Ω
-
75Ω
-
100Ω
-
200Ω
Pregunta 63
Pregunta
In the parallel circuit shown, if V=6V, R1=200Ω, and R2=500Ω what is the total resistance?
Respuesta
-
143Ω
-
200Ω
-
500Ω
-
700Ω
Pregunta 64
Pregunta
In the parallel circuit shown, if V=6V, R1=200Ω, and R2=500Ω what is the total current?
Respuesta
-
42mA
-
4.2µA
-
0.42A
-
8.5mA
Pregunta 65
Pregunta
What is the total resistance of this series-parallel circuit?
Respuesta
-
1660Ω
-
880Ω
-
460Ω
-
1000Ω
Pregunta 66
Pregunta
When electric current flows through a coil of wire it transforms the coil into a "temporary" device which is called a(n) ____________________.
Respuesta
-
bipolar rectifier
-
solenoidal toroid
-
electromagnet
-
diode
Pregunta 67
Pregunta
As a wound coil is stretched out longer (like stretching a slinky) the intensity of its magnetic field _________________.
Respuesta
-
increases
-
decreases
-
remains the same
-
cannot be determined without additional information
Pregunta 68
Pregunta
The type of electrical generator which puts out AC is called a(n) ___________________.
Respuesta
-
buck-boost generator
-
PWM dynamo
-
alternator
-
there is no such thing
Pregunta 69
Pregunta
The time required to complete one full alternating sine wave of AC is called the ___________________ of the waveform.
Respuesta
-
frequency
-
period
-
amplitude
-
window
Pregunta 70
Pregunta
The number of complete waveforms that occur in a single second of time is called the _________________ of the waveform.
Respuesta
-
frequency
-
period
-
amplitude
-
window
Pregunta 71
Pregunta
What is the unit we use to describe "cycles per second"?
Respuesta
-
Hurts
-
Hertz
-
Henries
-
Hours
Pregunta 72
Pregunta
A _________________ is a device that combines an electromagnet with one or more sets of switch contacts.
Respuesta
-
contactor
-
relay
-
both of these
Pregunta 73
Pregunta
A coil with a moving armature, used to create short-stroke linear motion, is called a _____________________.
Respuesta
-
contactor
-
solenoid
-
electromagnet
-
relay
Pregunta 74
Pregunta
When a relay is not energized, what resistance should you read across the NC (normally-closed) contacts?
Respuesta
-
1000Ω
-
0Ω
-
infinite ohms
-
cannot determine without additional information
Pregunta 75
Pregunta
If the frequency of an AC signal increases, the time of a single wave cycle __________________.
Respuesta
-
increases
-
decreases
-
does not change
-
cannot be determined
Pregunta 76
Pregunta
What is the more informal and physically descriptive name of the electrical component we call the inductor?
Respuesta
-
plug
-
core
-
coil
-
wheel
Pregunta 77
Pregunta
Inductance gives opposition to any change in circuit _________________.
Respuesta
-
resistance
-
voltage
-
current
-
power
Pregunta 78
Pregunta
When an inductor is first being energized with a DC current, the opposition to current changes is in the form of "back __________."
Respuesta
-
track
-
EMF
-
resistance
-
power
Pregunta 79
Pregunta
When an inductor is quickly removed from a power source, a forward voltage comes out of the coil which can be very high. This is commonly called __________ ___________ voltage.
Respuesta
-
high power
-
low ohms
-
kick back
-
feed back
Pregunta 80
Pregunta
The variable used to designate "inductance" in an equation is the letter __________.
Respuesta
-
B
-
K
-
L
-
C
Pregunta 81
Pregunta
The primary unit with which we quantify inductance is the _________________.
Respuesta
-
Gauss
-
Henry
-
Oersted
-
Farad
Pregunta 82
Pregunta
As an inductor is stretched out longer (like a slinky) its inductance _______________.
Respuesta
-
increases
-
decreases
-
remains the same
-
cannot be determined from the information given
Pregunta 83
Pregunta
When a permeable core material is added to a hollow inductor, its inductance ______________.
Respuesta
-
increases
-
decreases
-
remains the same
-
cannot be determined from the information provided
Pregunta 84
Pregunta
If we reduce the number of turns of wire in an inductor its inductance _________________.
Respuesta
-
increases
-
decreases
-
remains the same
-
cannot be determined from the given information
Pregunta 85
Pregunta
A transformer has 10 turns in its primary side and 40 turns in its secondary side. If 60VAC is applied to the primary the voltage measured across the secondary will be __________________.
Respuesta
-
30VAC
-
120VAC
-
240VAC
-
480VAC
Pregunta 86
Pregunta
The name of the unit used to describe the quantity of capacitance in a capacitor is the _______________.
Respuesta
-
Henry
-
Farad
-
Tesla
-
Gauss
Pregunta 87
Pregunta
As the common surface area of a capacitor's plates increases, the capacitance ______________.
Respuesta
-
increases
-
decreases
-
remains the same
-
cannot be determined without additional information
Pregunta 88
Pregunta
As the dielectric thickness of capacitors increases, separating the plates further apart, the capacitance ______________.
Respuesta
-
increases
-
decreases
-
remains the same
-
cannot be determined from the information provided
Pregunta 89
Pregunta
Which has a higher dielectric constant?
Respuesta
-
air
-
ceramic
-
aluminum
-
mica
Pregunta 90
Pregunta
Capacitors effectively block _______________ current but appear to allow ________________ current to pass through.
Respuesta
-
direct; alternating
-
alternating; direct
-
variable; direct
-
direct; constant
Pregunta 91
Pregunta
CT = C1 + C2 + C3 + ... + Cn is the formula used to calculate total capacitance for capacitors connected in _______________.
Respuesta
-
series
-
parallel
-
individually
-
no circuit configuration
Pregunta 92
Pregunta
For the image shown, what is the peak-to-peak voltage?
Respuesta
-
5V
-
14V
-
20V
-
27.5V
Pregunta 93
Respuesta
-
5V
-
14V
-
20V
-
27.5V
Pregunta 94
Pregunta
In the image shown, what is the period of the waveform?
Respuesta
-
200µs
-
600µs
-
1ms
-
2ms
Pregunta 95
Pregunta
In the image shown, what is the frequency for the waveform?
Respuesta
-
100Hz
-
500Hz
-
1,000Hz
-
5,000Hz
Pregunta 96
Pregunta
In the image shown, what is the RMS voltage for the sine wave?
Respuesta
-
5V
-
7.07V
-
9.75V
-
14.14V
Pregunta 97
Pregunta
A transformer has a 4 : 1 turns ratio. If the secondary voltage is 10V and secondary power is 40W, what is the primary current?
Respuesta
-
1mA
-
1A
-
4A
-
8A
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