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WorksheetsQuiz on Electrical Engineering Concepts
Total questions: 146
Worksheet time: 1hrs 16mins
What is the color code for a 220Ω 5% resistor?
Red, Red, Brown, Gold
Orange, Orange, Black, Gold
Red, Red, Black, Gold
Red, Red, Brown, Silver
If 60J of energy are available for every 15C of charge, what is the voltage?
4V
60V
15V
0.25V
An atom's atomic number is determined by the number of:
neutrons minus protons
protons
electrons
neutrons
A voltage will influence current only if the circuit is:
open
insulated
high resistance
closed
Which resistive component is designed to be temperature sensitive?
Thermistor
Rheostat
Potentiometer
Photoconductive cell
Primary batteries, unlike secondary batteries, may be:
charged once
used once
recharged over and over
stored indefinitely
In practical applications, battery voltage:
is restored as soon as disconnect occurs
is lowered as the load increases
may be stored indefinitely
will be reduced to zero as power is drawn
The negative and positive charge symbols are assigned to the:
proton and electron
electron and proton
atom and nucleus
electron and element
A voltmeter is used:
to measure current
in series with the circuit
in parallel with the circuit
to measure coulombs
If the current in a circuit equals 0 A, it is likely that the
voltage is too high
resistance is too low
circuit has a short
circuit is open
What are the unit and symbol for current?
Ampere, A
Coulomb, I
Ampere, Q
Ampere, I
Which part of an atom has no electrical charge?
Electron
Neutron
Proton
All of the above
Which voltage source converts chemical energy to electrical energy?
Electrical generator
Battery
Solar cell
Electronic power supply
An example of potential energy is:
tea-kettle steam
a moving vehicle
the sun
a battery
If 40C of charge flow past a point in 20s, what is the current?
2 A
0.5 A
20 A
40 A
Batteries differ from fuel cells in that
a battery is a closed system
a battery uses hydrogen and oxygen to create electricity
a battery uses a polymer electrolyte membrane
none of the above
The removal of a non-neutral subatomic particle converts the atom into a:
charged ion
nucleus
heavier element
compound
One coulomb passing a point in one second is one:
ampere
volt
ohm
charge
In which states a matter may be found?
solid, liquid, or mineral
solid, gas, or liquid
mineral, gas, or liquid
plastic, solid, or gas
Material that consists of a mixture of elements is considered to be:
an element
an ion
a compound
a molecule
How many valence shell electrons are there in semiconductor atoms?
16
8
4
2
When considering conventional current versus electron current flow:
electron current flow came first
protons move in conventional current flow
conventional current flow came first
the direction of current is the same in both methods
Which unit of charge contains 6.25×10^18 electrons?
An ampere
A coulomb
A volt
A joule
A switch is a device that:
short circuits complex circuits
holds a fuse
has double poles
opens or completes a current path
The term used to designate electrical pressure is:
voltage
current
resistance
conductance
Which electronics material opposes the movement of free electrons?
Conductor
Insulator
Semiconductor
Element
Current is considered as the movement of:
electrons
protons
charge
nuclei
A lead-acid battery is an example of a
Current is considered as the movement of:
electrons
protons
charge
nuclei
A lead-acid battery is an example of a
solar cell
fuel cell
primary battery
secondary battery
The charge of one coulomb is equal to:
6.24x10−18 electrons
one ampere
one second
6.24x10^18 electrons
A basic electric circuit is made up of what components?
A load, a resistor, and a conductive path for current
A voltage source, a load, and a conductive path for current
A voltage source, a conductive path for current, and a battery
A conductive path for current, a battery, and a copper wire
An ammeter is used to measure
voltage
current
resistance
All of the above
What is the name of the pressure that moves electrons in a closed circuit?
amperes
ohms
voltage
coulombs
What is a characteristic of a secondary cell?
rechargeability
not rechargeable
a dry cell
non-liquid
What are the basic building blocks that all matter is composed of?
electrons, neutrons, and protons
two protons for each neutron
two protons for each electron
electrons, neutrons, and charged ions
If a fluid system is compared to an electrical system, the fluid pump will correspond to a:
conductor
lamp
battery
insulator
An element is a substance that is:
varied throughout the entire piece
used only in electronics
electrically charged
found only in its pure form
Current is:
the presence of a positive charge
the abundance of electrons
the movement of electrons
the repulsion of electrons
What do you call a diagram that shows the electrical connections of a circuit's components?
A schematic diagram
A pictorial diagram
A block diagram
An electrical diagram
A short circuit will have:
a small current flow
a large current flow
no current flow
some current flow
The basic difference between a fuse and a circuit breaker is
a fuse is slower
a fuse is reusable
a circuit breaker is reusable
a circuit breaker is more reliable
Which is the smallest?
atom
proton
neutron
electron
A secondary cell generates DC via chemical activity; a primary cell generates DC:
electrically
thermally
optically
chemically
Which of the following statements is true?
Unlike charges repel and like charges attract.
Like charges repel and unlike charges attract.
Unlike charges attract and like charges attract.
Like charges repel and unlike charges repel.
If an electrical system is compared to a fluid system, the electrical current corresponds to the:
pressure
pump
water wheel
water flow
What theorem replaces a complex network with an equivalent circuit containing a source voltage and a series resistance?
Multinetwork
Norton
Thevenin
Superposition
In a series–parallel circuit, individual component power dissipations are calculated using:
individual component parameters
a percent of the voltage division ratio squared
total current squared multiplied by the resistor values
a percent of the total power depending on resistor ratios
The current flowing through an unloaded voltage divider is called the:
resistor current
load current
bleeder current
voltage current
When a Wheatstone bridge is in a balanced condition, the center voltmeter in the bridge will read:
twice the source voltage
the same as the source voltage
zero volts
half the source voltage
When a load is connected to a voltage divider, the total resistance of the circuit will:
decrease
double
increase
remain the same
With 21V applied, if R1 = 5 ohms, R2 = 35 ohms, and R3 = 14 ohms, what is the current of R2 if R1 is series connected with parallel circuit R2 and R3?
200 mA
800 mA
600 mA
400 mA
What is the total resistance of a circuit when R1 (7 kΩ) is in series with a parallel combination of R2 (20 kΩ), R3 (36 kΩ), and R4 (45 kΩ)?
4 kΩ
17 kΩ
41 kΩ
108 kΩ
When placed into a circuit, how are electronic components usually connected?
positive terminal to positive terminal
in parallel
as a combination of series and parallel
in series
If a Wheatstone bridge is balanced, a voltmeter in the center of the bridge will read:
the same as the source voltage
half the source voltage
zero volts
twice the source voltage
The first goal to accomplish in analyzing a complex series-parallel circuit is to
equate all parallel components
equate all series components
solve for all the voltage drops
solve for the total current and resistance
If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?
increases
decreases
remains the same
cannot tell
If a series-parallel circuit has all 30-ohm resistors, what is the total resistance when R1 is in series with a parallel circuit consisting of R2 and R3?
10 ohms
20 ohms
45 ohms
90 ohms
Components or combinations of components with common currents, in a series-parallel circuit, are in:
parallel with each other
series with each other
either series or parallel with each other
none of the above
What determines if resistor connections are in series, parallel, or series-parallel?
the voltage source
the power source
resistance
current flow
If R1 is in series with a parallel combination of R2, R3, and R4, when the resistance value of R2 increases, the voltage across R3 will
increase
decrease
remain the same
Cannot tell
A Wheatstone bridge can be used to determine an unknown
current
resistance
power
voltage
In a series-parallel circuit consisting of R1 and R2 in series and connected in parallel with R3, if R1 opens, then R2's voltage will:
increase
decrease
remain the same
cannot tell
With 6V applied, what is the voltage across R2 of a parallel combination of R2 (1 kΩ), R3 (2 kΩ), and R4 (1 kΩ) in series with R1, whose value is 2 kΩ?
1 V
3 V
5 V
6 V
What is the power dissipated by R1, R2, and R3?
P1 = 0.13 W, P2 = 0.26 W, P3 = 0.12 W
P1 = 0.26 W, P2 = 0.52 W, P3 = 0.23 W
P1 = 0.52 W, P2 = 0.92 W, P3 = 0.46 W
P1 = 1.04 W, P2 = 1.84 W, P3 = 0.92 W
In the given circuit, what is RUNK equal to if RV must be adjusted to 1,232Ω in order to balance the bridge?
220 Ω
6,899 Ω
1,232 Ω
More information is needed in order to find RUNK.
What is the applied voltage for a series RLC circuit when IT = 3 mA, VL = 30 V, VC = 18 V, and R = 1000 ohms?
3.00 V
12.37 V
34.98 V
48.00 V
In a parallel RLC circuit, which value may always be used as a vector reference?
current
reactance
resistance
voltage
How much current will flow in a 100 Hz series RLC circuit if VS = 20 V, RT = 66 ohms, and XT = 47 ohms?
1.05 A
303 mA
247 mA
107 mA
What is the Q (Quality factor) of a series circuit that resonates at 6 kHz, has equal reactance of 4 kilo-ohms each, and a resistor value of 50 ohms?
0.001
50
80
4.0
What is the range between f1 and f2 of an RLC circuit that resonates at 150 kHz and has a Q of 30?
100.0 kHz to 155.0 kHz
147.5 kHz to 152.5 kHz
4500 kHz to 295.5 kHz
149,970 Hz to 150,030 Hz
What effect will a parallel tank have upon final filter current?
very little
The bandpass frequencies will change.
The frequency cutoff will change.
The impedance will block output.
When a parallel circuit resonates it is said to:
flywheel
oscillate
both of the above
none of the above
Series RLC voltage or impedance totals must be calculated by:
subtracting the values
graphing the angles
adding vectors
multiplying the values
When XC = XL the circuit:
draws maximum current
applied voltage is zero
is at resonance
draws minimum current
How much current will flow in a series RLC circuit when VT =100 V, XL =160Ω, XC = 80Ω, and R = 60Ω?
1 A
1 mA
6.28 A
10 A
When a full band of frequencies is allowed to pass through a filter circuit to the output, the resonant circuit is called a:
low-pass filter
high-pass filter
band-stop filter
bandpass filter
At resonance, the term bandwidth includes all frequencies that allow what percentage of maximum current to flow?
50
62.3
70.7
95.3
What is the true power consumed in a 30V series RLC circuit if Z = 20 ohms and R = 10 ohms?
15.0 watts
22.5 watts
30.0 watts
45.0 watts
What is the current phase angle for a parallel RLC circuit when IL = 15.3 A, IC = 0.43 A, and IR = 3.5 A?
76.7 degrees
–4.25 degrees
88.8 degrees
–76.7 degrees
At any resonant frequency, what voltage is measured across the two series reactive components?
applied
reactive
zero
inductive and capacitive
What is the range between f1 and f2 of an RLC circuit that resonates at 150 kHz and has a Q of 30?
100.0 kHz to 155.0 kHz
147.5 kHz to 152.5 kHz
4500 kHz to 295.5 kHz
149,970 Hz to 150,030 Hz
At any resonant frequency, what net voltage is measured across the two series reactive components?
Applied voltage
Reactive voltage
Zero voltage
VL + VC voltage
If the bandwidth of a filter increases:
Q decreases
the roll-off rate increases
the half-power frequency decreases
the center frequency decreases
Series RLC impedance or voltage totals must always be calculated by
adding values vectorially
graphing the angles
multiplying the values
subtracting the values
What is the total impedance of a 60 Hz series RLC circuit when XL = 7.5 ohms, XC = 265.3 ohms, and R = 33 ohms?
257.8 ohms
259.9 ohms
290.8 ohms
1989.75 ohms
What is the high cutoff frequency for an RLC circuit that resonates at 2000 Hz and has a bandwidth of 250 Hz?
2125 Hz
2250 Hz
1750 Hz
8.0 Hz
Current in a series RLC circuit may always be used as:
a leading vector
a reference
an angle
a lagging vector
What is the approximate phase angle in a series RLC circuit when VC = 117 V, VR = 14.5V, and VL = 3.3V?
–45.0 degrees
–82.7 degrees
–90.0 degrees
–172.7 degrees
Which statement best describes reactance in a series RLC circuit?
Capacitive reactance is always dominant.
Inductive reactance is always dominant.
Resistance is always dominant.
The larger of the two reactances is dominant.
What is the band pass (F1 – F2) of an RLC filter that resonates at 150 kHz and has a coil Q of 30?
100.0 kHz to 155.0 kHz
147.5 kHz to 152.5
What is the band pass (F1 – F2) of an RLC filter that resonates at 150 kHz and has a coil Q of 30?
100.0 kHz to 155.0 kHz
147.5 kHz to 152.5 kHz
295.5 kHz to 4500 kHz
149,970 Hz to 150,030 Hz
What would be the power factor for an RLC circuit that acts inductively?
+90 degrees leading
one
zero
–90 degrees lagging
Voltage lags current in an RLC circuit when it acts:
capacitively
resistively
inductively
resonantly
What is a varistor?
a voltage-dependent resistor
a voltage-dependent diode
a current-dependent resistor
a current-dependent diode
Which type of transformer is required to create a 180 degree input to a rectifier?
center-tapped secondary
step-down secondary
stepped-up secondary
split winding primary
What circuit activity may shift a characteristic curve so that diode operating points are different?
higher power (heat)
higher resistance
lower voltage
lower current
The DC current through each diode in a bridge rectifier equals:
the load current
half the dc load current
twice the dc load current
one-fourth the dc load current
When matching polarity connections have been made and the potential difference (PD) is above 0.7 V, the diode is considered to be:
not working
forward biased
reverse biased
an open switch
In a power supply diagram, which block indicates a smooth dc output?
transformer
filter
rectifier
regulator
If a 169.7V half-wave peak has an average voltage of 54 V, what is the average of two full-wave peaks?
119.9 V
108.0 V
115.7 V
339.4 V
The characteristic curve for the complex model of a silicon diode shows that
the barrier potential is 0 V
the barrier potential stays fixed at 0.7 V
the barrier potential increases slightly with an increase in current
the barrier potential decreases slightly with an increase in current
Since diodes are destroyed by excessive current, circuits must have:
higher voltage sources
current limiting resistors
more dopants
higher current sources
A diode for which you can change the reverse bias, and thus vary the capacitance is called a
varactor diode
tunnel diode
zener diode
switching diode
A filtered full-wave rectifier voltage has a smaller ripple than does a half-wave rectifier voltage for the same load resistance and capacitor values because:
there is a shorter time between peaks
there is a longer time between peaks
the larger the ripple, the better the filtering action
none of the above
Testing a good diode with an ohmmeter should indicate
high resistance when forward or reverse biased
low resistance when forward or reverse biased
high resistance when reverse biased and low resistance when forward biased
high resistance when forward biased and low resistance when reverse biased
The peak inverse voltage (PIV) across a nonconducting diode in a bridge rectifier equals approximately:
half the peak secondary voltage
twice the peak secondary voltage
the peak value of the secondary voltage
four times the peak value of the secondary voltage
Electrons in the outermost orbit or shell of an atom are called
free electrons
negative ions
valence electrons
conduction band electrons
Shunting the AC component away from the load is the task of a:
transformer
filter
regulator
rectifier
A pn junction allows current flow when
the p-type material is more positive than the n-type material
the n-type material is more positive than the p-type material
both the n-type and p-type materials have the same potential
there is no potential on the n-type or p-type materials
When a diode is forward biased, the voltage across it
(a)
When a diode is forward biased, the voltage across it
is directly proportional to the current
is inversely proportional to the current
is directly proportional to the source voltage
remains approximately the same
Why is heat produced in a diode?
due to current passing through the diode
due to voltage across the diode
due to the power rating of the diode
due to the PN junction of the diode
The arrow in the schematic symbol of a diode points to
the n-type material, which is called the anode
the n-type material, which is called the cathode
the p-type material, which is called the anode
the p-type material, which is called the cathode
The diode schematic arrow points to the:
trivalent-doped material
positive axial lead
anode lead
cathode lead
When checking a diode, low resistance readings both ways indicate the diode is:
open
satisfactory
faulty
not the problem
In a diode schematic, the anode is represented by a(n):
triangle
vertical line
zig-zag line
element indicator
An IC regulator receives an overload; it will:
shut down
compensate for heat
provide more voltage
sample and adjust
With full-wave rectification, current through the load resistor must be:
in opposite directions
to the external load
from the reverse biased diode
in the same direction
A characteristic curve is the result of a current versus voltage plot of diode activity, which begins at the:
3rd quadrant
current plot
graph origin
voltage plot
Rectifier output polarity depends upon:
cycles of input
capacitor polarity
half or full wave
diode installation
With a 12V supply, a silicon diode, and a 370-ohm resistor in series, what voltage will be dropped across the diode?
0.3 V
0.7 V
0.9 V
1.4 V
If the frequency of the applied ac signal to a half-wave rectifier is 60 Hz, the frequency of the pulsating dc output will be
30 pps
60 pps
90 pps
120 pps
Thermal shutdown occurs in an IC regulator if:
power dissipation is too high
internal temperature is too high
current through the device is too high
load resistance increases
The conduction band is closest to the valence band in
semiconductors
conductors
insulators
The distance is the same for all of the above.
What is the percent of regulation if V nl = 20 V and V fl = 19.8 V?
0%
1%
0.1%
5%
With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?
0 degrees
90 degrees
180 degrees
360 degrees
Which of the following circuits would require the least amount of filtering?
A half-wave rectifier
A full-wave rectifier
A bridge rectifier
A full-wave rectifier and a bridge rectifier
The voltage where current may start to flow in a reverse-biased pn junction is called the
breakdown voltage
barrier potential
forward voltage
biasing voltage
Providing a constant output regardless of ac input or load resistance changes is the function of a:
transformer
filter
regulator
rectifier
When a diode is destroyed it has infinite impedance. When damaged by heat it will probably:
short
conduct more
conduct less
open
The area at the junction of p-type and n-type materials that has lost its majority carriers is called the
barrier potential
depletion region
n region
p region
DC power should be connected to forward bias a diode as follows:
– anode, + cathode
– cathode, – anode
+ anode, – cathode
DC power should be connected to forward bias a diode as follows:
anode, + cathode
cathode, – anode
+ anode, – cathode
+ cathode, + anode
At any given time in an intrinsic piece of semiconductor material at room temperature
electrons drift randomly
recombination occurs
holes are created
All of the above
In a power supply diagram, which block indicates a pulsating dc output?
transformer
filter
rectifier
regulator
List three diode packages:
clip package, DIP, small current package
DIP, small current package, large current package
small current package, large current package, and SIP
small current package, large current package, clip package
The mimicking of an open/closed switch by a diode allows alternating current to be:
rectified
regulated
controlled
attenuated
When does maximum power transfer happen from the source to the load?
When the source resistance is greater than the load resistance
When the source resistance is less than the load resistance
When there is negligible source resistance
When the source resistance equals the load resistance
The transformer turns ratio determines
the ratio of primary and secondary voltages
the ratio of primary and secondary currents
the reflected impedance
all of the above
A special transformer used to convert unbalanced signals to balanced signals is the
balun
autotransformer
center-tapped transformer
step-across transformer
If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is
100 W
50 W
75 W
200 W
A transformer has
primary and secondary windings, both of which are considered inputs
primary and secondary windings, both of which are considered outputs
a primary winding used as an output and a secondary winding used as an input
a primary winding used as an input and a secondary winding used as an output
When referring to instruction words, a mnemonic is:
a short abbreviation for the operand address
a short abbreviation for the operation to be performed
a short abbreviation for the data word stored at the operand address
shorthand for machine language
What is the difference between mnemonic codes and machine codes?
There is no difference.
Machine codes are in binary, mnemonic codes are in shorthand English.
Machine codes are in shorthand English, mnemonic codes are in binary.
Machine codes are in shorthand English, mnemonic codes are a high-level language.
Which bus is bidirectional?
data bus
control bus
address bus
multiplexed bus
