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Technician Licensing Class
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Section 10
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Schematic Symbols
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•
Schematic symbols is the name for standardized
representations of components in an electrical
wiring diagram.
T6C1
The symbols on an electrical circuit schematic
diagram represent electrical components.
• T6C12
•
The way electrical components are
interconnected accurately represent electrical
circuit schematic diagrams.
T6C13
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T6C2
Component 1 in figure T1 is a resistor.
3
Resistor
2
1
4
5
Figure T1
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•
Component 2 in figure T1 is a transistor.
T6C3
3
Transistor
2
1
4
Figure T1
5
•
To control the flow of current is the function of
component 2 in Figure T1.
T6D10
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•
T6C4
Component 3 in figure T1 is a lamp.
Lamp
3
2
1
5
4
Figure T1
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•
T6C5
Component 4 in figure T1 is a battery.
Battery
3
2
1
5
4
Figure T1
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•
Component 3 in figure T3 is a variable
inductor.
T6C10
4
2
1
3
Variable Inductor
Figure T3
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•
T6C11
Component 4 in figure T3 is an antenna.
4
2
1
3
Figure T3
Antenna
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•
A single-pole single-throw switch is
represented by item 3 in figure T2.
T6D3
Single-Pole Single-Throw Switch
2
3
9
5
4
7
1
6
10
8
Figure T2
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
T6C9
Component 4 in figure T2 is a transformer.
2
3
9
5
4
7
1
6
10
8
Figure T2
Transformer
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•
T6C6
Component 6 in figure T2 is a capacitor.
2
3
9
5
4
7
1
6
10
8
Figure T2
Capacitor
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•
Component 8 in figure T2 is a light emitting
diode.
T6C7
2
3
9
5
4
7
1
6
10
8
Figure T2
Light Emitting Diode
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•
T6C8
Component 9 in figure T2 is a variable resistor.
Variable Resistor
2
3
9
5
4
7
1
6
10
8
Figure T2
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A capacitor is used together with an inductor to
make a tuned circuit.
T6D8
Capacitor (variable)
Inductor
Tank Circuit or Tuned Circuit
Tank Circuit Schematic
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•
A meter can be used to display signal strength
on a numeric scale.
T6D4
S-Meter
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A switch controlled by an electromagnet best
describes a relay.
T6D2
Relays
Electromagnets
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•
T5B9
The approximate amount of change, measured in decibels
(dB), of a power increase from 5 watts to 10 watts is 3dB.
3 dB gain is a double of power
dB
3 dB
6 dB
9 dB
10 dB
20 dB
30 dB
40 dB
•
•
2x
4x
8x
10x
100x
1000x
10,000x
Power Change
Power change
Power change
Power change
Power change
Power change
Power change
Power change
The approximate amount of change, measured in
decibels (dB), of a power decrease from 12 watts to 3 watts is
6dB.
T5B11 The approximate amount of change, measured in
decibels (dB), of a power increase from 20 watts to 200 watts
is 10 dB.
T5B10
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•
A regulator is a type of circuit
that controls the amount of
voltage from a power supply.
T6D5
Voltage Regulators
A transformer is a component
commonly used to change 120V
AC house current to a lower AC
voltage for other uses.
•
T6D6
•
T6D9
Integrated circuit is the name
of a device that combines several
semiconductors and other
components into one package.
Voltage Transformer
Large-scale integrated circuit chips .
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•
The abbreviation "LED" stands for Light Emitting
Diode.
T6B7
An array of LEDs and resistors mounted on a printed circuit board
•
T6D7
An LED is commonly used as a visual indicator.
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


1500 kHz is another way to specify a radio signal
frequency of 1,500,000 hertz.
T5B3 One thousand volts are equal to one kilovolt.
T5B6 If an ammeter calibrated in amperes is used to
measure a 3000-milliampere of current, the reading would
it to be 3 amperes.
T5B2
Scientific Notation
Prefix
Multiplication Factor
Prefix
Multiplication Factor _
___________________________________________________
tera
giga
mega
kilo
hecto
deca
unit
1012
109
106
103
102
101
100
1,000,000,000,000
1,000,000,000
1,000,000
1,000
100
10
1
deci
centi
milli
micro
nano
pico
femto
10-1
10-2
10-3
10-6
10-9
10-12
10-15
0.1
0.01
0.001
0.000001
0.000000001
0.000000000001
0.000000000000001
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Metric
Tera
Giga
Mega
Kilo
Centi
Milli
Micro
Nano
Pico
Exponent
1012
109
106
103
10-2
10-3
10-6
10-9
10-12
English
Trillion
Billion
Million
Thousand
Hundredth
Thousandth
Millionth
Billionth
Trillionth
•
T5B5
0.5 watts is equivalent to 500 milliwatts.
•
T5B1
1,500 milliamperes is 1.5 amperes.
•
T5B8
One microfarads is equal to 1,000,000 picofarads.
•
T5B4
One one-millionth of a volts is equal to one microvolt
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•
T7D8
•
T7D9
Rosin-core solder is best for radio and electronic use.
A grainy or dull surface is the characteristic
appearance of a "cold" solder joint.
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•
•
•
•
Voltage and resistance are
measurements commonly made using a
multimeter.
T7D11 A precaution taken when measuring
circuit resistance with an ohmmeter is to
ensure that the circuit is not powered.
T7D6 Attempting to measure voltage when
using the resistance setting might damage a
multimeter.
T7D10 When an ohmmeter is connected across
a circuit and initially indicates a low
resistance and then shows increasing
resistance with time, the circuit contains a
large capacitor.
T7D7
Take Aways
 Schematic symbols are the name for standardized
representations of components in an electrical wiring
diagram.
 The symbols on an electrical circuit schematic diagram
represent electrical components.
 The way components are interconnected is accurately
represented in electrical circuit schematic diagrams.
 A Meter can be used to display signal strength on a numeric
scale.
Take Aways
3
2
1
4
5
Figure T1
26
Take Aways
2
3
9
5
4
7
1
6
10
8
Figure T2
27
Take Aways
4
2
1
3
Figure T3
28
Take Aways
 A Relay is a switch controlled by an electromagnet.
 A Regulator circuit controls the amount of voltage from a
power supply.
 A Transformer is commonly used to change 120V AC house
current to a lower AC voltage for other uses.
 An Integrated circuit is a device that combines several
semiconductors and other components into one package.
 A Tuned Circuit is a capacitor is
used together with an inductor.
Take Aways
Decibels (dB) measure the
approximate amount of change
3 dB
6 dB
10 dB
2x Power change
4x Power change
10x Power change
• The abbreviation "LED" stands for Light Emitting Diode.
• A LED is commonly used as a visual indicator.
Take Aways
 Another way to specify a radio signal frequency of 1,500,000
hertz is 1500 kHz.
 One thousand volts are equal to one kilovolt.
 If an ammeter calibrated in amperes is used to measure a
3000-milliampere current, the reading that it would show is 3
amperes.
 0.5 watts is equivalent to 500 milliwatts.
 1,500 milliamperes equals 1.5 amperes.
 1,000,000 picofarads is equal to 1 microfarad.
Take Aways
 One one-millionth of a volt is equal to one microvolt.
 Rosin-core solder is best for radio and electronic use.
 A grainy or dull surface is the characteristic appearance of a
"cold" solder joint.
 Voltage and resistance measurements are commonly made
using a multimeter. A multimeter is a multiple function meter
which may include capability to measure voltage, current and
resistance.
Take Aways
 A precaution that should be taken when measuring circuit
resistance with an ohmmeter is to ensure that the circuit is not
powered.
 Attempting to measure voltage when using the resistance
setting might damage a multimeter.
 When an ohmmeter, connected across a circuit, initially
indicates a low resistance and then shows increasing
resistance with time the circuit contains a large capacitor.
Element 2 Technician Class
Question Pool
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Valid July 1, 2010
Through
June 30, 2014
T6C01
A.
B.
C.
D.
What is the name for standardized
representations of components in an
electrical wiring diagram?
Electrical depictions
Grey sketch
Schematic symbols
Component callouts
T6C12
A.
B.
C.
D.
What do the symbols on an electrical
circuit schematic diagram represent?
Electrical components
Logic states
Digital codes
Traffic nodes
T6C13
A.
B.
C.
D.
Which of the following is accurately
represented in electrical circuit schematic
diagrams?
Wire lengths
Physical appearance of components
The way components are interconnected
All of these choices
T6C10
A.
B.
C.
D.
What is component 3 in figure T3?
Connector
Meter
Variable capacitor
Variable inductor
4
2
1
3
T6C11
A.
B.
C.
D.
What is component 4 in figure T3?
Antenna
Transmitter
Dummy load
Ground
4
2
1
3
T6D08
A.
B.
C.
D.
Which of the following is used together
with an inductor to make a tuned circuit?
Resistor
Zener diode
Potentiometer
Capacitor
T6C02
A.
B.
C.
D.
What is component 1 in figure T1?
Resistor
Transistor
Battery
connector
3
2
1
5
4
T6C03
A.
B.
C.
D.
What is component 2 in figure T1?
Resistor
Transistor
Indicator lamp
Connector
3
2
1
5
4
T6D10
What is the function of component 2 in
Figure T1?
A. Give off light when current flows
through it
B. Supply electrical energy
C. Control the flow of current
D. Convert electrical energy
2
1
into radio waves
5
3
4
T6C04
A.
B.
C.
D.
What is component 3 in figure T1?
Resistor
Transistor
Lamp
Ground symbol
3
2
1
5
4
T6C05
A.
B.
C.
D.
What is component 4 in figure T1?
Resistor
Transistor
Battery
Ground symbol
3
2
1
5
4
T6D03
A.
B.
C.
D.
What type of switch is represented by item
3 in figure T2?
Single-pole single-throw
Single-pole double-throw
Double-pole single-throw
Double-pole double-throw
2
3
9
5
4
7
1
6
8
10
T6C09
A.
B.
C.
D.
What is component 4 in figure T2?
Variable inductor
Double-pole switch
Potentiometer
Transformer 2 3
9
5
4
7
1
6
8
10
T6C06
A.
B.
C.
D.
What is component 6 in figure T2?
Resistor
Capacitor
Regulator IC
Transistor
2
3
9
5
4
7
1
6
8
10
T6C07
A.
B.
C.
D.
What is component 8 in figure T2?
Resistor
Inductor
Regulator IC
Light emitting diode
2
3
9
5
4
7
1
6
8
10
T6C08
A.
B.
C.
D.
What is component 9 in figure T2?
Variable capacitor
Variable inductor
Variable resistor
Variable transformer
2
3
9
5
4
7
1
6
8
10
T6D04
A.
B.
C.
D.
Which of the following can be used to
display signal strength on a numeric scale?
Potentiometer
Transistor
Meter
Relay
T6D02
A.
B.
C.
D.
What best describes a relay?
A switch controlled by an electromagnet
A current controlled amplifier
An optical sensor
A pass transistor
T5B09
A.
B.
C.
D.
What is the approximate amount of change,
measured in decibels (dB), of a power increase
from 5 watts to 10 watts?
2 dB
3 dB
5 dB
10 dB
T5B10
A.
B.
C.
D.
What is the approximate amount of change,
measured in decibels (dB), of a power decrease
from 12 watts to 3 watts?
1 dB
3 dB
6 dB
9 dB
T5B11
A.
B.
C.
D.
What is the approximate amount of change,
measured in decibels (dB), of a power increase
from 20 watts to 200 watts?
10 dB
12 dB
18 dB
28 dB
T6D05
A.
B.
C.
D.
What type of circuit controls the amount of
voltage from a power supply?
Regulator
Oscillator
Filter
Phase inverter
T6D06
A.
B.
C.
D.
What component is commonly used to
change 120V AC house current to a lower
AC voltage for other uses?
Variable capacitor
Transformer
Transistor
Diode
T6D09
A.
B.
C.
D.
What is the name of a device that combines
several semiconductors and other
components into one package?
Transducer
Multi-pole relay
Integrated circuit
Transformer
T6B07
A.
B.
C.
D.
What does the abbreviation "LED" stand
for?
Low Emission Diode
Light Emitting Diode
Liquid Emission Detector
Long Echo Delay
T6D07
A.
B.
C.
D.
Which of the following is commonly used
as a visual indicator?
LED
FET
Zener diode
Bipolar transistor
T5B02
A.
B.
C.
D.
What is another way to specify a radio
signal frequency of 1,500,000 hertz?
1500 kHz
1500 MHz
15 GHz
15 kHz
T5B03
A.
B.
C.
D.
How many volts are equal to one kilovolt?
One one-thousandth of a volt
One hundred volts
One thousand volts
One million volts
T5B06
A.
B.
C.
D.
If an ammeter calibrated in amperes is
used to measure a 3000-milliampere
current, what reading would it show?
0.003 amperes
0.3 amperes
3 amperes
3,000,000 amperes
T5B05
A.
B.
C.
D.
Which of the following is equivalent to 500
milliwatts?
0.02 watts
0.5 watts
5 watts
50 watts
T5B01
A.
B.
C.
D.
How many milliamperes is 1.5 amperes?
15 milliamperes
150 milliamperes
1,500 milliamperes
15,000 milliamperes
T5B08
A.
B.
C.
D.
How many microfarads are 1,000,000
picofarads?
0.001 microfarads
1 microfarad
1000 microfarads
1,000,000,000 microfarads
T5B04
A.
B.
C.
D.
How many volts are equal to one microvolt?
One one-millionth of a volt
One million volts
One thousand kilovolts
One one-thousandth of a volt
T7D08
A.
B.
C.
D.
Which of the following types of solder is
best for radio and electronic use?
Acid-core solder
Silver solder
Rosin-core solder
Aluminum solder
T7D09
A.
B.
C.
D.
What is the characteristic appearance of a
"cold" solder joint?
Dark black spots
A bright or shiny surface
A grainy or dull surface
A greenish tint
T7D07
A.
B.
C.
D.
Which of the following measurements are
commonly made using a multimeter?
SWR and RF power
Signal strength and noise
Impedance and reactance
Voltage and resistance
T7D11
Which of the following precautions should
be taken when measuring circuit resistance
with an ohmmeter?
A. Ensure that the applied voltages are
correct
B. Ensure that the circuit is not powered
C. Ensure that the circuit is grounded
D. Ensure that the circuit is operating at
the correct frequency
T7D06
Which of the following might damage
a multimeter?
A. Measuring a voltage too small for the
chosen scale
B. Leaving the meter in the milliamps
position overnight
C. Attempting to measure voltage when
using the resistance setting
D. Not allowing it to warm up properly
T7D10
A.
B.
C.
D.
What is probably happening when an ohmmeter,
connected across a circuit, initially indicates a low
resistance and then shows increasing resistance with time?
The ohmmeter is defective
The circuit contains a large capacitor
The circuit contains a large inductor
The circuit is a relaxation oscillator