The National Electrical code is

the electrical industry rules pertaining to property, safety

The output of a DC power supply will have with a longer RC time constant

less ripple and smoother output

An opto-isolator provides

isolation for coupling electronic circuits

Max power will be be transferred when the?

source impedance equals the load

In telephone local loop circuits the common impedance of twisted pair cabling and connectors is

1200Ω cable with block connectors

reads multiple sensor inputs for process control

A truth table shows what?

all combinations of logic states of a gate

DMM are preferred over common analog meters?

when accuracy is most important

A class A amplifier as compared to a class B or C?

allow signals to be reflected back towards the source

A cable with an HDMI connector?

has both audio and video digital signals

The USB connector is used to connect what?

peripherals with a high speed serial port

the force lines between the north and south poles of amagnet

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Questions 90

Answers

1
which one of the following integrated circuit or semiconductor devices normally requires care
TTL
CMOS
ECL
MOV
2
Ladder diagrams help to?
understand process flow
prevent falling
build electronic circuits
direct traffic
3
AC can be produced from
iron rods
batteries
rotating coils of wire
striking a match on a copper plate
4
exposed to high sound levels from audio systems or noise from operating equipment.
safety glasses
anti-static clothing
ear protection
a helment
5
The National Electrical code is
the electrical industry rules pertaining to property, safety
a standard for setting soldering
electrical safety rules promulgated by each state
similar to Morse code
6
The output of a DC power supply will have with a longer RC time constant
more ripple and regulation
less ripple and smoother output
better regulation
twice the power
7
to safely work on a circuit with power off, refers to
decorating
locking devices
complying with AEC rules
lock out tag out procedures
8
which of these is considered to be an amplifier?
Digtial IC
transistor
transformer
Diode
9
An opto-isolator provides
isolation for coupling electronic circuits
for eliminating distortion in high level signals
electrical grounding
high current to inductive loads
10
A 3 input NAND gate has 2 low inputs and a high input. the output will be what?(001)
low
not enough info to determine
high
neither high or low
11
The symbol for an NPN transistor will show the emitter arrow?
pointing in to the emitter
pointing out to the emitter
identifying the collector, not the emitter
not used to identify any of the elements
12
Common AWG wire gauge sizes for small electronic circuits and tellecomms wiring is
10 or 12
16 or 18
36 or 40
24 or 26
13
Hexadecimal value of the binary number 1111 is?
C
F
B
A
14
Max power will be be transferred when the?
power out is greater than the power in
input is the same as the output voltage
power in is equal to the power out
source impedance equals the load
15
when soldering high voltage connections, what in order to reduce leakage or arcing?
leave the terminal
leave a wick in place
utilize a thermal shunt
use a minimum of solder
16
A picture of top and bottom view of a circuit board shows?
the same layout as a schematic
does not have a use
embedded or through paths
the locations of the parts
17
One ampere of electrical current flowing through one ohm of resistance is energized by
One Volt
one Henry
One Watt
One Coulomb
18
distortion in amplifiers can be caused by?
low level signals
operation in center of load line
class A operation
incorrect bias
19
decreasing the voltage gain or signal level by 50%, is what?
-3dB
-10dB
-6dB
-20dB
20
In telephone local loop circuits the common impedance of twisted pair cabling and connectors is
75Ω ohm cable with F connectors
600Ω cable with RJ45 connector
50Ω cable with N connectors
1200Ω cable with block connectors
21
If the distance between the turns in a coil is increased the total inductance will
decrease
be zero
increase
not be affected
22
In radio frequency work, coaxial cable has a what rating impedance
300Ω
75Ω
50Ω
600Ω
23
A PLC is?
converts DC to AC
replaces discrete components
reads multiple sensor inputs for process control
inverts AC to DC
24
to replace a suspected failed component with a known good part as?
simplifying
splitting
solving
substituting
25
A low impedance dynamic microphone with an XLR connector is an
microphone
resistive load
output device
input device
26
A truth table shows what?
all combinations of logic states of a gate
gate input and output voltage levels
only the logic outputs if the gate inputs are 1
boolean equations of gate operations
27
The C of 2 capacitors connected in parallel is
the sum of both
less than the smallest
more than the largest
½ of the sum
28
DMM are preferred over common analog meters?
for convience
when accuracy is most important
where operator safety is a factor
when fluctuating signals are to be checked
29
A logic tracer test probe can?
encode magnetic strips
analyze the digital signals for intelligence
inject logic signals into digital circuit
detect a logic state
30
frequency bands used for cellular phones are?
UHF
SHF
EHF
VHF
31
which of the below values CANNOT be measured with a simple meter such as a VOM or DMM?
Z
R
V
I
32
A class A amplifier as compared to a class B or C?
has the best efficiency
has more distortion
produces the most power gain
allow signals to be reflected back towards the source
33
to write a program, a programmer could use?
flash player
adobe reader
mircosoft word
C++
34
one amp is the charge of one coulomb in how many seconds?
100
10
1
1000
35
A program that allows modifying of TEXT DOCUMENTS is a?
graphics editor
virus scanner
word processor
internet browser
36
A block diagram is?
makes circuit more complicated
shows more circuit detail
simplifies complex circuit
list all parts
37
A cable with an HDMI connector?
connects directly to an attena
has both audio and video digital signals
will connect to an RCA component output jack
terminates into an F type Rf connector
38
resistors in electrical circuits are used to
generate voltage
create current
store electrons
limit current
39
the decimal number 164 converted to binary is?
01110100
100010101
10010101
10100100
40
Which circuit configuration has the same amount of voltage drop across its components?
Parallel
Series-parallel
Combination
Series
41
Voltage potential across an electrical device can create a charge of electrons and is called
ohm
volt
coulomb
Ampere
42
For flexibility line cords connecting equipment to a source of power are made of
solid copper
aluminum
stranded wire
Silver plated wire
43
The USB connector is used to connect what?
peripherals with a high speed serial port
tri-sate devices on a shared data bus
computer clock signals
CPU registers on a parallel data bus
44
which of the following is most common risk when using desoldering equipment to remove IC chips?
damaging the PC traces
PC board flammability
air tin fumes
burning up the chip plastic case
45
A microprocessor CPU contains
dynamic host protocols
input output registers
RAM
power supplies
46
to find help about a component availability, call the tech support or login onto?
all of the above
a data base of known problems
a parts distributors web site
an internet forum
47
which of the below CANNOT have its programmed data changed?
RAM
ROM
EPROM
EEROM
48
What is the unit of measure for electrical pressure and electromotive force?
Amps
Volts
Ohms
Watts
49
the ability to talk and listen at the same time during telephone or cellular communication is
duplex or full duplex
equalization
half duplex
compression
50
Magnetic flux is
the paste used when soldering magnets together
the force lines between the north and south poles of amagnet
usually found in insulators
one or the other poles of a bar magnet
51
Wattage rating of a component is often determined by
the physical size
the schematic symbol
its color
its inductance
52
DC series constructed motor speed varies greatly depending on?
armature current
field winding wire size
load
starting torque
53
the gain of an Op-amp circuit is controlled by what resistor?
thermal generator
output resistance
feedback and input
power dropping
54
which of the following is classified as a thyristor?
BJT
Op-Amp
SCR
FET
55
semiconductor symbols show an arrow pointing to the what type material?
P
N
A
C
56
causes to current to flow?
V
W
C
R
57
silicon p-n junctions has a barrier of
0.1
0.3
1.25
0.7
58
A LED normally lights when it is what kind of biased and above or below the conduction point?
reverse, below
reverse, above
forward, above
forward,below
59
LCD are?
use ultraviolet blue light waves
produce their own light like an LED
use a non-polarizing optical filter
use a back light for readability
60
operating system software provides control over?
BIOS function
CPU, keyboard, input, output, disk drives, and memory
power supply regulation
clock rate
61
AC variable frequency control panel can monitor sensors to?
adjust motor speed
calibrate a power source
vary temperature
function as a generator
62
A MOSFET is?
amplifies input voltage changes
amplifies input current changes
has low input impedance
also called a FETMOS
63
the most commonly used fractional horse power motor is what type?
series wound
asynchronous
induction
three phase
64
what is the ripple frequency of a full wave single-phase bridge rectifier operated at 60Hz
120Hz
90Hz
360Hz
180Hz
65
After splicing or fitting a connector on a cable it should be
installed
tested
imprinted with the tester's mark
pulled to check for tensile-strength breaking-point
66
A CCD sensor is used is used in a what?
audio input circuit
digital camera
optical output circuit
GPS reciver
67
part designation on circuit boards usually use the?
first letter of the name of the part
x-y coordinates location of the part
color coded valuse
value of the component
68
In audio work, line level signals on an RCA connector are approximately what?
0.1V
10V
1V
5V
69
Which of the following forwards data packets along a network on the OSI network layer?
Hub
router
switch
bridge
70
In telephone local loop circuits the common impedance of twisted pair cabling and connectors is
battery plant power supply
T-1 long haul rack
operator switchboard
hand crank generator
71
In binary, numbers are limited to how many digital states
8
4
2
16
72
When installing an RJ45 fitting, the maximum length of untwisting CAT5e telephone wire is
no untwisting is allowed
no more than 1.25 inches
enough to allow slack
specified in ANSI/TIA standard
73
routine backup protects against what?
healthy disk drives
virus programs scanning too frequently
data loss
corrupt ROM memory
74
In video circuits, common cable impedance is what ohms using what connector?
300, RCA
75,F
600,RJ45
50,BNC
75
cold solder joints are often caused by what?
spraying the final soldering job joint with refrigerant
the joint not reaching temperature
soldering outdoors
overheating the joint
76
60/40 lead/tin solder used in electrical work is being replaced worldwide by what solder?
lead-acid
lead-free tin/silver alloys
liquid based paste
gold/tin
77
Solder flux?
is highly flammable
is being phased out worldwide
reduces oxidation
is only used to clean types of solder tips
78
Audio or video distortion is frequently caused by
class A operation in the center of the load line
low level signals
correct bias
signals too high or low power supply voltage
79
when charged, an individual lead-acid battery cell,has a normal MAX voltage of?
3.4V
1.2V
6.3V
2.1V
80
A speaker with 8Ωvoice coil is an
inductive output device
resistive load
microphone
capacitive input device
81
A switch or fuse is connected how to a load
to create
across
in parallel with
in series with
82
A transformer with a primary of 117VAC and a secondary of 11.7VAC
auto
step-down
shorted
step-up
83
Lasers are found in what?
headphones
hard drives
read/write optical disk drives
routers
84
IP addressing separates users and equipment on?
a long distance trunk
a data bus
an analog phone line
the internet
85
what current level is lethal?
10mA
100mA
10μA
1000μA
86
A series connected coupling capacitor connects 2 circuits for what?
producing square waves pulses
filtering ripple
transferring a sine wave signal
matching DC levels
87
Which of the following power formulas is a version of Watt's law
P=I*E
P=E2*R
P= R*E
P=I2*E
88
A signal generator can be used to?
input test signal into a circuit
power a radio station
detect where voltage is lost
replace power line voltage temporarily during power outages
89
A dual trace oscilloscope has?
2 sets of position controls
2 vertical inputs
1 set of position controls
2 focus conrols
90
Electric current or the movement of electrons can be easily induced in
protons
conductors
insulators
neutrons

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