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Associate CET Practice Exam #1 Flashcards | StudBud
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Associate CET Practice Exam #1
Associate CET Practice Exam #1
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1
What is meant by “transformer action”?
The action in which an expanding and contracting magnetic field around...
The transfer of energy from one circuit to another by electromagnetic...
The transfer of energy from one circuit to another circuit by magnetic...
The transfer of load voltage to the center-tapped secondary through...
2
In an inductor/coil inductance varies as the ____ of the number turns.
Square
Inverse
Cube
Log
3
How many PN junctions does a Unijunction transistor have?
Five
Two
One
Four
4
Using a scientific calculator, a 3300 ohm resistor can be entered with scientific notation as:
3.3 * 102
330 * 102
33 * 103
3.3 * 103
5
What type of diagram shows electrical connections and functions of specific circuit arrangments?
Block
Ishikawa and single-line
Schematic
Pictorial
6
A MOSFET is comprised of what four elements?
Base, source, drain and dielectric
Dielectric, source, drain and base
Gate, source, drain and substrate
Gate, source, collector and substrate
7
Calculate total impedance for the circuit below.
420 Ohms
1012.75 Ohms
979.93 Ohms
120 Ohms
8
What is the frequency of the sine wave blow?
150KHz
222.5KHz
150Hz
250Hz
9
Two basic uses for transformers are:
Power supplies and bias control
Signal matching and voltage regulation
Voltage regulation and rectification
Signal matching and power supplies
10
If a signal decreases by 3 dB, how much power is lost?
66%
22.5%
50%
33%
11
What is the difference between calculating impedance for a series AC circuit and a parallel AC circuit?
Series = current and reactance, parallel = resistive and reactive into A/V
Series = resistance and reactance, parallel = resistive and reactive A/V
Series = current and reactance, parallel = resistive and reactive into V/A
Series = current and reactance, parallel = resistive and reactive into A/A
12
An electromagnetic wave is composed of an electromagnetic and electric field, which are at ____ from one another.
45 degrees
180 degrees
270 degrees
90 degrees
13
Which bipolar transistor configuration has a current gain of less than 1?
Emitter follower
Common base
Common emitter
Common collector
14
Which truth table is correct for the following logic diagram?
A
D
B
C
15
What does the acronym EAROM stand for?
Electrically Accessible Random Only Memory
Electrically Actuated Read Only Memory
Electrically Alterable Read Only Memory
Electrically Accessible Read Only Memory
16
Ohm's Law states that resistance is calculated by voltage divided by current. How do you determine power?
Current squared, divided by resistance
Voltage divided by resistance
Current divided by resistance
Voltage times current
17
What is the formula to properly calculate “Vout” for the voltage divider below?
Vout = (R2/R2+R1) * Vin
Vout = (R1/R2+R1) * Vin
Vout = (R2/R2*R1) + Vin
Vout = (R1/R2+Vin) * Vin
18
Using ohm's law for the circuit below, calculate the total power.
16 uW
166.6 mW
16.6 mW
160.65 mW
19
The basic properties associated with alternating voltage and current are:
frequency, deviation, wavelength and amplitude
magnitude, period, wavelength and amplitude
frequency, period, designation and amplitude
frequency, period, wavelength and amplitude
20
What components value is measure in millihenries?
Diode
resistor
Inductor
Capacitor
21
An analog multimeter (AMM) checks for:
Voltage, resistance and inductance
Current, resistance and capacitance
Voltage, current and resistance
Voltage, resistance and capacitance
22
With three 2.5k resistors and one 3.4k resistor in parallel, the total resistance is:
669.29 Ohms
670.50k Ohms
66.29 ohms
668.81k Ohms
23
When compared to a JFET, the base of a bipolar transistor is similar to what element of the JFET?
Emitter
Gate
Drain
Source
24
What is the number one concern in regards to electrical safety?
ESD
Proper grounding
Faulty equipment
Shock
25
In a capacitive circuit, what is the voltage and current relationship?
Voltage leads
Current lags
Resistance leads
Voltage lags
26
If a series circuit has three resistors valued at 10k, 15k and 20k ohms, with a source of 15V, the total current is...
333.33 uA
3.33 uA
333.33 mA
33.33 uA
27
What is I
z
for the circuit below?
6A
7A
2A
5A
28
The split capacitors in a Colpitts oscillator provide:
regenerative feedback
degenerative feedback
a phase shift in signal
interelement capacitance
29
What is one way to minimize parasitic oscillations?
Use a blocking oscillator
Increase the resonant tank frequency
Place a swamping resistor across the transformer
Reduce the fundamental frequency of frequency-determining-device
30
Zener diodes are designed to operate in the ____ bias region.
forward
reactive
depletion
reverse
31
What is the preferred method for removing solder from a component attached to a circuit card assembly (CCA)
Motorized vacuum extracation
Manual extraction vacuum
Shaking the CCA when solder melt is achieved
Wicking
32
Opening and closing vinyl envelopes used to carry work instruction, with 10-20% relative humidity, electrostatic reaches
7,000V
18,000V
35,000
2,500V
33
The 4-meter frequency band is also known as the ____ band.
118.000 MHz
70 MHz
39 MHz
9 MHz
34
What are three processor functions of a CPU?
Asynchronous communications interface, peripheral interface control and...
Arithmetic communication interface, peripheral interface control and...
Arithmetic logic, data frequency timing and control
Arithmetic logic, interfacing and control
35
In the circuit below, what is the current across R2?
3.3A
2A
5A
2.5A
36
What is impedance?
The resistance of a component at a given frequency
The conductivity of a component at a given frequency
The ability of a component to store a charge at a given frequency
The potential difference of a component at a given frequency
37
In a class "C" Collector:
Collector current will flow for approx. 180 degrees (half) of the input...
Collector current flows for less than one half cycle of the input signal.
Output current flows for the complete cycle of the input
Collector current is cut off during one-half of the input signal
38
Calculate the voltage drop across C1.
43.66V
28.44V
50V
4.7V
39
Silicon diodes have an approximate voltage drop of:
1.414V
.9V
.3V
.7V
40
What is the decimal sum of 10010 and 11001?
25
43
18
110
41
Bohr's Atomic Model consists of what three components?
Protons, neutrons and electrons
Tachyons gravitons and electrons
Protons, neutrons and cations
Neutrons, ion, neutrinos
42
A coaxial cable's velocity of propagation factor depends on what two factors?
Trans-induction and dielectric constant
Radio frequency and permeability
Common mode current reflection and permeability
Dielectric constant and permeability
43
Given a battery rated at 350 ampere-hours, how many hours will the battery be able to provide 7 amperes?
25
17.5
50
35
44
Why is flux used when soldering?
To prevent cold solder joints
To add impurities into the solder
To prevent the formation of metal oxides at extreme temperatures
To act as a bonding accelerant
45
What formula is used to calculate output voltage of a difference operational amplifier?
Vout = (Rf*Rin) (V2-RF)
Vout = (Rf/Rin) (V2-V1)
Vout = (Rf/Rin)+(V2-V1)
Vout = (Rf/Rin) (V2-RF)
46
What are three types of materials used in electronics?
Semi-conductors, insulators and semi-insulators
Conductors, semi-conductors and insulators
Conductors, insulators and regulators
Insulators, conductors and interions
47
What is the total inductance of the circuit below?
0.90H
4.24H
4.63H
9H
48
A resistor has three color bands of red, brown and brown. What is the ohmic value of this resistor?
205 Ohms
100 Ohms
330 Ohms
210 Ohms
49
Each type of coaxial cable is designed with ____, which is dependent on materials and dimensions used.
characteristics impedance
transverse impedance
skin effect
standing waves
50
The formula to calculate dBm from mW is:
10 log10 (P/1mW)
10 log10 (P/.5mW)
10 log10 (P2/1mW)
20 log10 (P/1mW)
51
If an oscilloscope TIME/DIV is at .2 microseconds and the width is at 8 divisions, what is the pulse width?
1.6 microseconds
.8 microseconds
.4 microseconds
4 microseconds
52
Calculate the capacitive reactance for 440 Hz and 9uF.
44 Ohms
37.37 Ohms
40.21 Ohms
.02 Ohms
53
What is the modulus of a five-stage binary counter?
16
15
31
32
54
What is a primary advantage of a FET when compared to the bipolar transistor?
Low input impedance
Gate biasing in resistive controlled
High input impedance
No advantage
55
In the kinescope, the ___ intensity of an electron beam from an electron gun is modulated in accordance with the ____...
voltage, amplitude
current, frequency
phase, frequency
current, amplitude
56
-3dBm is equal to how many milliwatts?
.4 mW
1.5 mW
5 mW
.5 mW
57
What is the hexadecimal equivalent of the decimal number 622?
258
26E
26F
20A
58
What does LEC stand for?
Local essential channel
Local exchange carrier
Local exchange circuit
Local effective communication
59
To properly bias the NPN transistor below, which voltages are correct?
E = +3; B = +1; C = -7
E = -1.7; B = -2.7; C = -5
E = 0; B = 0; C = +12
E = -1; B = +1; C = +10
60
Total resistance in a series circuit equals:
the average value of the voltage drop across each resistor in the circuit
the sum of all the resistor values within the circuit
The sum of the power dissipated by each resistor
half the measure resistance multiplied by the applied voltage
61
What are the three fundamental types of wireless access technologies?
FDMA, QMA and TDMA
FDMA, CDMA and WPA
FDMA, CDMA and TDMA
FDMA, L2TP and TDMA
62
Given the series circuit below, what is the total capacitance?
.008uF
.076mF
.8uF
.08uF
63
In the circuit below, what is the voltage output at letter “X”, when I put voltage is 25V
5V
10V
25V
15V
64
Why are crystal oscillators preferred over other types of oscillators?
Tolerance for frequency error or drift is not important
When a resistive dampening effective is needed
Reduced amplitude through degenerative feedback is preferred
When keeping frequency error or drift at a minimum is important
65
In the United States there are five common classifications of fires, which are:
A, B, C, E, M
A, B, C, D, E
A, C, D, K, M
A, B, C, D, K
66
What is the calculated effective voltage for the wave form below?
10.96V
4.933V
5.48V
7.75V
67
An oscilloscope with two vertical inputs, is commonly referred to as a ____ oscilloscope.
multi-trace
dual-trace
modulation-trace
sweep trigger-trace
68
In a common anode, seven-segment LED display, and individual LED will light if negative is applied to what element?
Anode
Segment 1
Cathode
Segment 7
69
circuit switch networks maintain only ___ path(s) for the duration of the call.
two
one
seven
six
70
Current amounts between ____ and ____ can be lethal.
4mA, 10mA
33.3, 75.6mA
100mA, 200mA
10mA, 33.3mA
71
A thyristor is a semiconductor with ____ layers that form ____ PN junctions.
3, 2
5, 4
3, 3
4, 3
72
When the frequency of an applied voltage is increased, the capacitive reactance of a circuit will:
Decrease
Increase
Stay unchanged
Short all capacitors to ground
73
The time required to charge a capacitor to 63 percent is known as:
Thevenin’s constant
A time constant
A linear superposition
Tau
74
What are the three basic parts of a transformer?
Primary winding, secondary winding and core
Primary winding, power diode and secondary winding
Primary winding, secondary winding and tertiary winding
Primary winding, dielectric and core
75
What is the voltage at terminal “A” for the Wheatstone bridge below?
1.3V
2.2V
1.86V
10.3V
76
In this circuit below, what is the calculated power for R3?
72 W
42.3 W
64.8 W
43.2 W
77
Current in a parallel circuit is:
inversely proportional to the circuits resistance
equal to the voltage source, minus the branch resistances
equal to the sum of the branches resistance
equally divided among each branch
78
What four methods are used in coupling amplifier stages?
Direct, LC, impedance, and transformer coupling
Direct, RC, diode, and transformer coupling
Direct, RC, impedance, and transformer coupling
Transistor, RC, impedance, and transformer coupling
79
Due to the config of filtering, the ability of a _ type filter to remove ripple voltage is superior to that of _ or _
T, crystal-capacitive, inductive
T, capacitive, resistive
Pi, capacitive, inductive
L, resistive-capacitive, inductive
80
Coulomb's law describes the forces of attraction or repulsion between electrical charges, which are...
inversely proportional, indirectly proportional
indirectly proportional, directly proportional
inversely proportional, directly proportional
directly proportional, inversely proportional
81
What is the digital gate equivalent for the circuit below?
OR
AND
NAND
NOR
82
What does the acronym ESD stand for?
Electrostatic Device
Electrostatic Discharge
Electromagnetic Sensitivity Diac
Electrostatic Damage
83
In the circuit below, what is the value of R2?
76.76 Ohms
75.75 Ohms
67.75 Ohms
77.77 Ohms
84
A vertically polarized antenna has a magnetic field that is at a ____ angle to the axis of the antenna.
135 degrees
22.5 degrees
45 degrees
90 degrees
85
In a resistive-capacitive circuit the vector line relationship shows two lines... What’s the phase relationship?
In phase
180 degree difference
Out of phase
90 degrees
86
To overcome noise, distortion and cost of maintenance in frequency division multiple systems, ___ systems were developed
phase-time division
code division multiple access
quadrature amplitude modulation
time-division multiplex
87
Voltage or potential difference is the measure of potential energy between two points in a circuit and is commonly...
voltage drop
difference in conduction
potential resistance
voltage flow
88
In regards to AWG standards, which gauge of wire has a bigger cross-sectional area?
24 AWG
16 AWG
20 AWG
18 AWG
89
Why is a differentiator used at the input of a flip-flop?
To provide high input impedance
To produce a sharp spike
To provide negative resistance
To produce a rounded waveform
90
When calculating power levels, which formula is correct?
dB = 1 * log (P1/P2)
dB = log (P1/P2)
dB = 20 * log (P1/P2)
dB = 10 * log (P1/P2)
91
The coaxial cable leading to a TV is a 75 ohm transmission line. If you use 10base2 coax cable for networking, that is a
150
300
25
50
92
What is the radix of the hexadecimal number system?
2
8
32
16
93
Electrons are arranged in ____ around the nucleus.
orthogonal lattices
loops
shells
spheres
94
In the illustration below, what component of the coaxial cable is letter “B”?
Ground mesh
Outer insulation
Center conductor
Dielectric
95
Ohm's Law characterizes the relationship between:
capacitance, inductance, voltage and current
power, resistance, current and voltage
power, coulombs, current and joules
inductance, resistance, current and joules
96
The magnetic field that surrounds a magnet can best be describes as invisible lines of force, and are commonly...
Lines of flux
Lines of destiny
Lines of attraction
Lines of flux proportionality
97
In a series resistive and reactive circuit what formula is used to find total impedance?
Z = √(R2+X2)/2
Z = R2 (X2/2)
Z = X2 (R2/2)
Z = √(R2+X2)
98
What is the resonant frequency for the circuit below?
15 kHz
75 kHz
7.5 kHz
30 kHz
99
With one series 8 Ohm resistor connected to two in-parallel resistors, 20 and 30 Ohms, what is the total resistance?
30 Ohms
8 Ohms
20 Ohms
38 Ohms
100
Lead and tin solder at a respective percentage of 63/37 melts at ____.
155° F
341° F
351° F
361° F
