Multiple Choice
Identify the choice that
best completes the statement or answers the question.
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1.
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What does the acronym ESD stand for?
A. | Electrostatic Discharge | B. | Electrostatic Device | C. | Electromagnetic
Sensitivity Diac | D. | Electrostatic
Damage |
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2.
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Current amounts between ______ and _____ can be
lethal.
A. | 100mA, 200mA | B. | 10mA, 33.3mA | C. | 33.3,
75.6mA | D. | 4mA, 10mA |
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3.
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What is the number one concern in regards to
electrical safety?
A. | Proper grounding | B. | ESD | C. | Shock | D. | Faulty
equipment |
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4.
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Bohr's Atomic Model consists of what three
components?
A. | Neutrons, ion, neutrinos | B. | Protons, neutrons and cations | C. | Tachyons gravitons and electrons | D. | Protons, neutrons and electrons |
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5.
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Electrons are arranged in _____ around a
nucleus.
A. | orthogonal lattices | B. | shells | C. | loops | D. | spheres |
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6.
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What are three types of materials used in
electronics?
A. | Conductors, semi-conductors and
insulators | B. | Semi-conductors,
insulators and semi-insulators | C. | Insulators,
conductors and interions | D. | Conductors,
insulators and regulators |
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7.
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In the United States there are five common
classifications of fires, which are:
A. | A, C, D, K, M. | B. | A, B ,C, D, E. | C. | A, B, C, E,
M. | D. | A, B, C, D, K. |
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8.
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Coulomb's Law describes the forces of
attraction or repulsion between electrical charges, which are ______________ to the product of the
charges ______________ to the distance between them.
A. | directly proportional, inversely
proportional | B. | inversely
proportional, directly proportional | C. | indirectly
proportional, directly proportional | D. | inversely
proportional, indirectly proportional |
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9.
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The magnetic field that surrounds a magnet can best
be described as invisible lines of force, and are commonly referred to as:
A. | lines of flux. | B. | lines of density. | C. | lines of
attraction. | D. | lines of flux
proportionality. |
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10.
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An analog multimeter (AMM) checks
for:
A. | voltage, resistance and
inductance. | B. | voltage,
resistance and capacitance. | C. | current,
resistance and capacitance. | D. | voltage, current
and resistance. |
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11.
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An oscilloscope with two vertical inputs, is
commonly referred to as a _______ oscilloscope.
A. | multi-trace | B. | dual-trace | C. | sweep
trigger-trace | D. | modulation-trace |
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12.
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Voltage or potential difference is the measure of
potential energy between two points in a circuit and is commonly referred to as:
A. | voltage drop. | B. | voltage flow. | C. | difference in
conduction. | D. | potential
resistance. |
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13.
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What is impedance?
A. | The resistance of a component at a given
frequency | B. | The conductivity of a component at a given
frequency | C. | The potential difference of a component at a given
frequency | D. | The ability of a component to store a charge at a given
frequency |
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14.
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A resistor has three color bands of red, brown and
brown. What is the ohmic value of this resistor?
A. | 205 Ohms | B. | 100 Ohms | C. | 210
Ohms | D. | 330 Ohms |
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15.
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What components value is measured in
millihenries?
A. | Capacitor | B. | Inductor | C. | Resistor | D. | Diode |
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16.
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Ohm's Law characterizes the relationship
between:
A. | power, coulombs, current and
joules. | B. | inductance, resistance, current and
joules. | C. | power, resistance, current and
voltage. | D. | capacitance, inductance, voltage and
current. |
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17.
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Ohm’s Law states that resistance is
calculated by voltage divided by current. Using Ohms law, how do you determine
power?
A. | Voltage times current | B. | Current divided by resistance | C. | Current squared, divided by resistance | D. | Voltage divided by resistance |
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18.
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Using a scientific calculator, a 3300 ohm resistor
can be entered with scientific notation as:
A. | 3.3 * 10^3. | B. | 33 * 10^3. | C. | 3.3 *
10^2. | D. | 330 * 10^2. |
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19.
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Total resistance in a series circuit
equals:
A. | half the measured resistance multiplied by the applied
voltage. | B. | the average value of the voltage drops across each
resistor within the circuit. | C. | The sum of the
power dissipated by each resistor. | D. | the sum of all the
resistor values within the circuit. |
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20.
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If a series circuit has three resistors valued at
10k Ohms, 15k Ohms and 20k Ohms, with a voltage source of 15V, the total current will
be_____.
A. | 333.33mA | B. | 33.33uA | C. | 333.33uA | D. | 3.33uA |
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21.
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Current in a parallel circuit is:
A. | equally divided among each
branch. | B. | inversely proportional to the circuits
resistance. | C. | equal to the sum
of the branch resistances. | D. | equal to the
voltage source, minus the branch resistances. |
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22.
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With three 2.5k resistors and one 3.4k resistor in
parallel, the total resistance is:
A. | 668.81k Ohms. | B. | 66.29 Ohms. | C. | 669.29
Ohms | D. | 670.50k Ohms. |
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23.
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With one series 8 Ohm resistor connected to two
in-parallel resistors, 20 and 30 ohms respectively, what is the total resistance (Rt)?
A. | 38 Ohms | B. | 30 Ohms | C. | 20
Ohms | D. | 8 Ohms |
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24.
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Given a battery rated at 350 ampere-hours how many
hours will the battery be able to provide 7 amperes?
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25.
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The basic properties associated with alternating
voltage and current are:
A. | frequency, period, wavelength and
amplitude. | B. | frequency,
deviation, wavelength and amplitude. | C. | magnitude, period,
wavelength and amplitude. | D. | frequency, period,
designation and amplitude. |
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26.
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What is the calculated effective voltage for the
wave form below?
A. | 7.75V | B. | 5.48V | C. | 10.96V | D. | 4.933V |
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27.
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What is the frequency of the sine wave
below?
A. | 150Hz | B. | 250Hz | C. | 22.5KHz | D. | 150KHz |
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28.
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In the illustration below, what component of the
coaxial cable is letter “B”?
A. | Ground mesh | B. | Outer insulation | C. | Dielectric | D. | Center
conductor |
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29.
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In an inductor/coil inductance varies as the
_______ of the number of turns.
A. | Cube | B. | Square | C. | Inverse | D. | Log |
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30.
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What is the total inductance of the circuit below?
A. | 0.90H | B. | 4.24H | C. | 4.63H | D. | 9H |
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31.
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Two basic uses for transformers are:
A. | power supplies and bias
control. | B. | signal matching and power
supplies. | C. | signal matching and voltage
regulation. | D. | voltage regulation
and rectification. |
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32.
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What is meant by "transformer
action"?
A. | The action in which an expanding and contracting
magnetic field around the primary winding cuts the secondary winding and induces a direct voltage
into the winding | B. | The transfer of
energy from one circuit to another circuit by magnetic rectification | C. | The transfer of load voltage to the center-tapped secondary through
capacitance | D. | The transfer of
energy from one circuit to another circuit by electromagnetic
induction |
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33.
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What are the three basic parts of a
transformer?
A. | Primary winding, dielectric and
core | B. | Primary winding, secondary winding and
core | C. | Primary winding, power diode and secondary
winding | D. | Primary winding, secondary winding and tertiary
winding |
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34.
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In the circuit below, what is the voltage output at
letter “X”, when input voltage is 25V?
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35.
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The time required to charge a capacitor to 63
percent is known as:
A. | Thevenin’s constant. | B. | a time constant. | C. | a linear
superposition. | D. | Tau. |
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36.
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Given the series capacitive circuit below, what is
the total capacitance?
A. | .008uF | B. | .08uF | C. | .076mF | D. | .8uF |
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37.
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Calculate the capacitive reactance for 440 Hz and
9µF.
A. | 44 Ohms | B. | .02 Ohms | C. | 37.37
Ohms | D. | 40.21 Ohms |
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38.
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In a resistive-capacitive circuit the vector line
relationship shows two lines perpendicular to each other. What is the phase
relationship?
A. | In phase | B. | Out of phase | C. | 180 degree
difference | D. | 90
degree |
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39.
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In a capacitive circuit, what is the voltage and
current relationship?
A. | Current lags | B. | Voltage lags | C. | Resistance
leads | D. | Voltage leads |
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40.
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When the frequency of an applied voltage is
increased the capacitive reactance of a circuit will:
A. | decrease. | B. | increase. | C. | stay
unchanged. | D. | short all
capacitors to ground. |
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41.
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What is the difference between calculating
impedance for a series AC circuit and a parallel AC circuit?
A. | A series impedance calculation is derived from current
and reactance, while parallel impedance is calculated with resistive and reactive current divided
into the source current | B. | A series impedance
calculation is derived from resistance and reactance, while parallel impedance is calculated with
resistive and reactive current divided into the source voltage | C. | A series impedance calculation is derived from current and reactance, while
parallel impedance is calculated with resistive and reactive current divided into the source
voltage | D. | A series impedance calculation is derived from current
and reactance, while parallel impedance is calculated with resistive and reactive voltage divided
into the source current |
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42.
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Each type of coaxial cable is designed
with_____________, which is dependent on materials and dimensions used.
A. | characteristic impedance | B. | standing waves | C. | transverse
impedance | D. | skin effect |
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43.
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A coaxial cable's velocity of propagation
factor depends on what two factors?
A. | Dielectric constant and
permeability | B. | Radio frequency
interference and permeability | C. | Common mode
current reflection and permeability | D. | Trans-induction
and dielectric constant |
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44.
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In a series resistive and reactive circuit what
formula is used to find total impedance?
A. | Z = X2
(R2/2) | B. | Z =sqrt(
R2 + X2) | C. | Z =R2 (
X2/2) | D. | Z =sqrt(
R2 + X2)/2 |
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45.
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Silicon diodes have an approximate voltage drop
of:
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46.
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To properly bias the NPN transistor below, which
voltages are correct?
A. | E = +3; B = +1; C = -7 | B. | E = -1; B = +1; C = +10 | C. | E = -1.7; B =
-2.7; C = -5 | D. | E = 0; B = 0; C =
+12 |
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47.
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In regards to AWG standards, which gauge of wire
has a bigger cross-sectional area?
A. | 16 AWG | B. | 18 AWG | C. | 20
AWG | D. | 24 AWG |
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48.
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Using ohm’s law for the circuit below,
calculate the total power.
A. | 166.6 mW | B. | 160.65 mW | C. | 16.6
mW | D. | 16 uW |
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49.
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In the circuit below, what is the calculated power
for R3.
A. | 42.3W | B. | 43.2W | C. | 64.8W | D. | 72W |
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50.
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In the circuit below, what is the current across
R2?
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51.
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What is the voltage at terminal ‘A’ for
the Wheatstone bridge below?
A. | 10.3V | B. | 2.2V | C. | 1.3V | D. | 1.86V |
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52.
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What formula is used to properly calculate
‘Vout’ for the voltage divider below?
A. | Vout =
(R2/R2+R1) * Vin | B. | Vout = (R1/R2+R1) *
Vin | C. | Vout =
(R1/R2+Vin) * Vin | D. | Vout = (R2/R2*R1) +
Vin |
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53.
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In the circuit below, what is the value of
R2?
A. | 75.75 ohms | B. | 77.77 ohms | C. | 76.76
ohms | D. | 67.75 ohms |
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54.
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What is a primary advantage of a FET when compared
to the bipolar transistor?
A. | High input impedance | B. | Low input impedance | C. | Gate biasing is
resistive controlled | D. | No
advantage |
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55.
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Zener diodes are designed to operate in the _____
bias region.
A. | forward | B. | depletion | C. | reverse | D. | reactive |
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56.
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When compared to a JFET, the base of a bipolar
transistor is similar to what element of the JFET?
A. | Gate | B. | Drain | C. | Source | D. | Emitter |
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57.
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A MOSFET is comprised of what four
elements?
A. | Gate, source, collector and
substrate | B. | Gate, source, drain and
substrate | C. | Base, source, drain and
dielectric | D. | Dielectric,
source, drain and base |
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58.
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How many PN junctions does a Unijunction transistor
have?
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59.
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Which bipolar transistor configuration has a
current gain of less than 1?
A. | Common base | B. | Common collector | C. | Emitter
follower | D. | Common emitter |
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60.
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A thyristor is a semiconductor with _____ layers
that form ____ PN junctions.
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61.
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Calculate total impedance for the circuit
below.
A. | 120 ohms | B. | 420 ohms | C. | 1012.75
ohms | D. | 979.93 ohms |
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62.
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Calculate the voltage drop across C1.
A. | 43.66V | B. | 4.7V | C. | 28.44 | D. | 50V |
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63.
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What is Iz for the circuit
below?
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64.
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When calculating power levels, which formula is
correct?
A. | dB=log(P1/P2) | B. | dB=10*log(P1/P2) | C. | dB=20*log(P1/P2) | D. | dB=1*log(P1/P2) |
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65.
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If a signal decreases by 3 dB, how much power is
lost?
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66.
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-3dBm is equal to how many
milliwatts?
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67.
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The formula to calculate dBm from mW
is:
A. | 10 log10( P / 1mW) | B. | 20 log10( P / 1mW) | C. | 10 log10( P / .5mW) | D. | 10 log10( P^2 / 1mW) |
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68.
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The split capacitors in a Colpitts oscillator
provide:
A. | regenerative feedback. | B. | interelement capacitance. | C. | degenerative feedback. | D. | a phase shift in
signal. |
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69.
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Why are crystal oscillators preferred over other
types of oscillators?
A. | When keeping frequency error or drift at a minimum is
important | B. | Reduced amplitude through degenerative feedback is
preferred | C. | Tolerance for frequency error or drift is not
important | D. | When a resistive dampening effective is
needed |
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70.
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What is the resonant frequency for the circuit
below?
A. | 7.5 kHz | B. | 15 kHz | C. | 30
kHz | D. | 75 kHz |
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71.
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Why is a differentiator used at the input of a
flip-flop?
A. | To produce a sharp spike | B. | To provide negative resistance | C. | To provide high input impedance | D. | To produce a rounded waveform |
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72.
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What is one way to minimize parasitic
oscillations?
A. | Place a swamping resistor across the
transformer | B. | Increase the
resonant tank frequency | C. | Use a blocking
oscillator | D. | Reduce the
fundamental frequency of frequency-determining-device |
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73.
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In a class ‘C’collector:
A. | output current flows for the complete cycle of the
input. | B. | collector current is cut off during one-half of the
input signal. | C. | collector current
will flow for approximately 180 degrees (half) of the input signal. | D. | collector current flows for less than one half cycle of the input
signal. |
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74.
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What is the radix of the hexadecimal number
system?
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75.
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What is the hexadecimal equivalent of the decimal
number 622?
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76.
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What is the decimal sum of 10010 and
11001?
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77.
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What is the digital gate equivalent for the circuit
below?
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78.
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Which truth table is correct for the following
logic diagram?
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79.
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What does the acronym EAROM stand
for?
A. | Electrically Accessible Random Only
Memory | B. | Electrically Alterable Read Only
Memory | C. | Electrically Accessable Read Only
Memory | D. | Electrically Actuated Read Only
Memory |
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80.
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What are three processor functions of a
CPU?
A. | Arithmetic logic, interfacing and
control | B. | Asynchronous communications interface, peripheral
interface control and serial data coupling | C. | Arithmetic logic,
data frequency timing and control | D. | Arithmetic
communications interface, peripheral interface control and serial data
coupling |
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81.
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If an oscilloscopes TIME/DIV is set at .2
microseconds, and the width of the pulse measured is at 8 divisions on the scope graticule, what is
the pulse width?
A. | .8 microseconds | B. | 1.6 microseconds | C. | 4
microseconds | D. | .4
microseconds |
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82.
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The coaxial cable leading to a cable TV is a 75 ohm
transmission line. If you use 10Base2 coax cable for networking, that is a _____ ohm transmission
line.
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83.
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Why is flux used when soldering?
A. | To prevent cold solder joints | B. | To add impurities into the solder | C. | To act as a bonding accelerant. | D. | To prevent the formation of metal oxides at extreme
temperatures |
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84.
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Lead and tin solder at a respective percentage of
63/37 melts at ______:
A. | 351o F. | B. | 361o F. | C. | 341o
F. | D. | 155o
F. |
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85.
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What four methods are used in coupling amplifier
stages?
A. | Direct, RC, diode, and transformer
coupling | B. | Direct, LC, impedance, and transformer
coupling | C. | Transistor, RC, impedance, and transformer
coupling | D. | Direct, RC, impedance and transformer
coupling |
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86.
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What formula is used to calculate output voltage of
a Difference operational amplifier?
A. | Vout = (Rf/Rin)(V2 - V1) | B. | Vout = (Rf/Rin)+(V2 - V1) | C. | Vout = (Rf/Rin)(V2 - RF) | D. | Vout = (Rf*Rin)(V1
- RF) |
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87.
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Due to the configuration of the filtering
components, the ability of a_____ type filter to remove ripple voltage is superior to that of either
the _______ or ________ filter.
A. | L, resistive-capacitive,
inductive | B. | Pi, capacitive, inductive | C. | T, capacitive, resistive | D. | T,
crystal-capacitive, inductive |
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88.
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What type of diagram shows electrical connections
and functions of a specific circuit arrangement?
A. | Pictorial | B. | Schematic | C. | Block | D. | Ishikawa and
single-line |
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89.
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Opening and closing vinyl envelopes used to carry
work instructions, with 10-20% relative humidity, electro-static voltages can reach as high
as:
A. | 2,500V | B. | 18,000V | C. | 7,000V | D. | 35,000V |
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90.
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What is the modulus of a five-stage binary
counter?
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91.
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What is the preferred method for removing solder
from a component attached to a circuit card assembly (CCA)?
A. | Motorized vacuum extraction | B. | Wicking | C. | Manual extraction
vacuum | D. | Shaking the CCA when solder melt is
achieved |
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92.
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To overcome noise, distortion and cost of
maintenance in frequency division multiple systems, ________ systems were developed.
A. | time-division multiplex | B. | phase-time division | C. | code division
multiple access | D. | quadrature
amplitude modulation |
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93.
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What does LEC stand for?
A. | Local exchange carrier | B. | Local essential channel | C. | Local effective
communication | D. | Local exchange
circuit |
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94.
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Circuit switch networks maintain only _____ path(s)
for the duration of the call.
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95.
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What are the three fundamental types of wireless
access technologies?
A. | FDMA, QMA and TDMA | B. | FDMA, CDMA and WPA | C. | FDMA, L2TP and
TDMA | D. | FDMA, CDMA and
TDMA |
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96.
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In the kinescope, the ________ intensity of an
electron beam from an electron gun is modulated in accordance with the ________ variations of signals
received by a control electrode, or modulator.
A. | current, frequency | B. | voltage, amplitude | C. | phase,
frequency | D. | current,
amplitude |
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97.
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An electromagnetic wave is composed of an
electromagnetic and electric field, which are at ______ from one another.
A. | 90 degrees | B. | 180 degrees | C. | 270
degrees | D. | 45 degrees |
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98.
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A vertically polarized antenna has a magnetic field
that is at a _____ angle to the axis of the antenna.
A. | 22.5 degree | B. | 90 degree | C. | 45
degree | D. | 135 degree |
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99.
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The 4-meter frequency band is also known as the
_____ band.
A. | 70 MHz | B. | 39 MHz | C. | 9
MHz | D. | 118.000 MHz |
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100.
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In a common anode, seven-segment LED display, an
individual LED will light if a negative voltage is applied to what element?
A. | Cathode | B. | Segment 7 | C. | Segment
1 | D. | Anode |
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