1

Technician Licensing Class

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Valid July 1, 2014

Through

June 30, 2018

Section 10

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Schematic Symbols

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• T6C01 Schematic symbols is the name for standardized representations of components in an electrical wiring diagram.

• T6C12 The symbols on an electrical circuit schematic diagram represent electrical components.

• T6C13 The way electrical components are interconnected accurately represent electrical circuit schematic diagrams.

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• T6D08 We use series and parallel inductors and capacitors to develop a tuned circuit inside your radio..

Tank Circuit or Tuned Circuit

Capacitor (variable)

Inductor

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• T6D11 A resonant circuit must contain at least one inductor and one capacitor connected in series or parallel to form a filter.

Tank or Tune Circuit Schematic

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T6C02 Component 1 in figure T1 is a resistor.

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Figure T1

Resistor

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• T6C03 Component 2 in figure T1 is a transistor.

•T6D10 To control the flow of current is the function of component 2 in Figure T1.

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Figure T1

Transistor

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• T6C04 Component 3 in figure T1 is a lamp.

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5Figure T1

Lamp

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• T6C02 Component 4 in figure T1 is a battery.

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Figure T1

Battery

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•T6C11 Component 3 in figure T3 is an Variable Inductor

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Figure T3

Variable Inductor

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•T6C11 Component 4 in figure T3 is an antenna.

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Figure T3

Antenna

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•T6D03 A single-pole single-throw switch is represented by item 3 in figure T2.

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Figure T2

Single-Pole Single-Throw Switch

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T6C09 Component 4 takes in everything around it, and is a transformer. Voltage is passed from the windings on the left, to the windings on the right, with the two vertical lines representing an iron core.

Figure T2Transformer

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• T6C06. Component 6 has 2 parallel (sort of) plates, separated by an insulation, so it must be a capacitor.

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Figure T2

capacitor.

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• T6C07. Component 8 is a Light Emitting Diode (LED).

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Light Emitting Diode

Figure T2

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• T6C08 Component 9 is a resistor, but it has a variable tap point on it, so it is a variable resistor. It is called a potentiometer, and this could be the volume control on your handheld.

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variable resistor

Figure T2

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• T6D04 Your larger, high-frequency transceivers may have a mechanical meter movement to illustrate incoming signal strength. Even if it is an LED or LCD readout, we still call it a signal strength meter.

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T6D02 A mobile radio that puts out 50 watts will likely contain a relay. The relay is a mechanical switch, opened and closed by current passing through a coil, creating an electromagnet. As soon as the coil is energized, the switch goes from one state to another.

Electromagnets

Relays

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• T6D05 A regulator is a type of circuit that controls the amount of voltage from a power supply.

• T6D06 A transformer is a component commonly used to change 120V AC house current to a lower AC voltage for other uses.

• T6D09 Integrated circuit is the name of a device that combines several semiconductors and other components into one package.

Large-scale integrated circuit chips .

Voltage Regulators

Voltage Transformer

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•T5B09 The approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10

watts is 3dB.

• T5B10 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.

3 dB6 dB9 dB

10 dB

20 dB30 dB40 dB

2x4x8x

10x100x

1000x10,000x

Power changePower changePower changePower changePower changePower changePower change

dB Power Change

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• T6B07 LED stands for Light Emitting Diode, The LED draws almost no amount of current and will last for hundreds of thousands of hours without burnout. LED = Light Emitting Diode.

• T6D07 A good visual indicator on a handheld radio is the LED – the light emitting diode that is often used as a transmit indicator.

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• T5B02 Another way to specify a radio signal frequency of 1,500,000 Hz as 1,500 kHz, or 1.5 MHz.

• T5B13 If a frequency readout shows a reading of 2425 MHz, what frequency is that in GHz? There are 1,000 MHz in one GHz, so we can simply divide by 1000 to get the final answer, 2.425 GHz.

• T5B07 If a frequency readout shows a reading of 3.525 MHz, what frequency is that in kHz? There are 1,000 kHz in one MHz, so we can simply multiply by 1000 to get the final answer, 3525 kHz.

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• T5B03 kilo means one thousand. 1000 volts equals 1 kilovolt.

• T5B06 One ampere equal 1000 milliamperes. If an ammeter calibrated in amperes is used to measure a 3000-milliampere of current, the reading would it to be 3 amperes.

• T5B12 There are a thousand Kilohertz in one Megahertz,

so 28,400 kHz is equal to 28.400 MHz

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Metric Prefixes

1,000,000.000,000M k o m m e i n i i g l e l c a o l r e o

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• T5B05 0.5 watts is equivalent to 500 milliwatts.• T5B01 1,500 milliamperes is 1.5 amperes.• T5B08 One microfarads is equal to 1,000,000

picofarads.• T5B04 One one-millionth of a volts is equal to one

microvolt

Metric Exponent English Tera 1012 Trillion Giga 109 Billion Mega 106 Million Kilo 103 Thousand Centi 10-2 Hundredth Milli 10-3 Thousandth Micro 10-6 Millionth Nano 10-9 Billionth Pico 10-12 Trillionth

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T7D08 Rosin-core is best for radio and electronic use.

Always use rosin-core solder.

Always wear protective glasses

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• T7D09 It’s easy to tell if you’ve made a good solder connection – the solder looks shiny. However, a “cold,” poorly-soldered joint looks grainy and dull.

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• T7D07 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.

• T7D11 Any time you are checking a

circuit with an ohmmeter,

make sure the circuit is not powered!

• T7D06 You’re likely to damage your multimeter

by measuring voltage if you accidentally leave it

in the resistance setting.

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• 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.

Take Aways

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

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Resistor

Lamp

Transistor that controls flow of current

Battery

Figure T1

Take Aways

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Figure T2

Single-Pole Single-Throw Switch

Transformer

capacitor.

Light Emitting Diode

variable resistor

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Figure T3

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A Tuned Circuit is a capacitor combined with an inductor to create a filter.

Antenna

Variable Inductor

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.

The abbreviation "LED" stands for Light Emitting Diode.

A LED is commonly used as a visual indicator.

Take Aways

Decibels (dB) measure amount of change using a logarithmic scale

An amount of change of a power increase from 5 watts to 10 watts (change factor of 2) is 3dB.

An amount of change of a power decrease from 12 watts to 3 watts (change factor of 4) is -6dB.

An approximate amount of change of a power increase from 20 watts to 200 watts (change factor of 10) is 10 dB.

3 dB6 dB9 dB

10 dB

20 dB

2x4x8x

10x100x

Power changePower changePower changePower changePower change

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 shown 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

Another way to specify a radio signal frequency of 1,500,000 hertz is 1500 kHz.

One thousand volts are equal to one kilovolt.

A frequency of 2425 MHz is equal to 2.425 GHz. There are 1000 Megahertz in one Gigahertz.

A frequency readout of 3.525 MHz would show as 3525 kHz. There are 1,000 kiloHertz in one MegaHertz.

One one-millionth of a volt is equal to one microvolt.

Take Aways

Rosin-core solder is best for radio and electronic use.

A grainy or dull surface is the characteristic appearance of a "cold" solder joint.

Measurements commonly made using a multimeter are voltage 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.

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Element 2 Technician Class Question Pool

Valid July 1, 2014

Through

June 30, 2018

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T6C01 What is the name for standardized representations of components in an electrical wiring diagram?

A. Electrical depictions

B. Grey sketch

C. Schematic symbols

D. Component callouts

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T6C12 What do the symbols on an electrical circuit schematic diagram represent?

A. Electrical components

B. Logic states

C. Digital codes

D. Traffic nodes

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T6C13 Which of the following is accurately represented in electrical circuit schematic diagrams?

A. Wire lengths

B. Physical appearance of components

C. The way components are interconnected

D. All of these choices

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T6C10 What is component 3 in figure T3?

A. Connector

B. Meter

C. Variable capacitor

D. Variable inductor

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T6C11 What is component 4 in figure T3?

A. Antenna

B. Transmitter

C. Dummy load

D. Ground

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T6D08 Which of the following is used together with an inductor to make a tuned circuit?

A. Resistor

B. Zener diode

C. Potentiometer

D. Capacitor

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T6D11 What is a simple resonant or tuned circuit?

A. An inductor and a capacitor connected in series or parallel to form a filter

B. A type of voltage regulator

C. A resistor circuit used for reducing standing wave ratio

D. A circuit designed to provide high fidelity audio

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T6C02 What is component 1 in figure T1?

A. Resistor

B. Transistor

C. Battery

D. connector

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T6C03 What is component 2 in figure T1?

A. Resistor

B. Transistor

C. Indicator lamp

D. Connector

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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 into radio waves

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T6C04 What is component 3 in figure T1?

A. Resistor

B. Transistor

C. Lamp

D. Ground symbol

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T6C05 What is component 4 in figure T1?

A. Resistor

B. Transistor

C. Battery

D. Ground symbol

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T6D03 What type of switch is represented by item 3 in figure T2?

A. Single-pole single-throw

B. Single-pole double-throw

C. Double-pole single-throw

D. Double-pole double-throw

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T6C09 What is component 4 in figure T2?

A. Variable inductor

B. Double-pole switch

C. Potentiometer

D. Transformer

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T6C06 What is component 6 in figure T2?

A. Resistor

B. Capacitor

C. Regulator IC

D. Transistor

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T6C07 What is component 8 in figure T2?

A. ResistorB. InductorC. Regulator ICD. Light emitting diode

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T6C08 What is component 9 in figure T2?

A. Variable capacitorB. Variable inductorC. Variable resistorD. Variable transformer

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T6D04 Which of the following can be used to display signal strength on a numeric scale?

A. Potentiometer

B. Transistor

C. Meter

D. Relay

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T6D02 What best describes a relay?

A. A switch controlled by an electromagnet

B. A current controlled amplifier

C. An optical sensor

D. A pass transistor

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T6D05 What type of circuit controls the amount of voltage from a power supply?

A. Regulator

B. Oscillator

C. Filter

D. Phase inverter

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T6D06 What component is commonly used to change 120V AC house current to a lower AC voltage for other uses?

A. Variable capacitor

B. Transformer

C. Transistor

D. Diode

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T6D09 What is the name of a device that combines several semiconductors and other components into one package?

A. Transducer

B. Multi-pole relay

C. Integrated circuit

D. Transformer

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T5B09 What is the approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10 watts?

A. 2 dB

B. 3 dB

C. 5 dB

D. 10 dB

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T5B10 What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts?

A. -1 dBB. -3 dBC. -6 dBD. -9 dB

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T5B11 What is the approximate amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts?

A. 10 dB

B. 12 dB

C. 18 dB

D. 28 dB

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T6B07 What does the abbreviation "LED" stand for?

A. Low Emission Diode

B. Light Emitting Diode

C. Liquid Emission Detector

D. Long Echo Delay

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T6D07 Which of the following is commonly used as a visual indicator?

A. LED

B. FET

C. Zener diode

D. Bipolar transistor

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T5B02 What is another way to specify a radio signal frequency of 1,500,000 hertz?

A. 1500 kHz

B. 1500 MHz

C. 15 GHz

D. 150 kHz

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T5B13 If a frequency readout shows a reading of 2425 MHz, what frequency is that in GHz?

A. 0.002425 GHz

B. 24.25 GHz

C. 2.425 GHz

D. 2425 GHz

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T5B03 How many volts are equal to one kilovolt?

A. One one-thousandth of a volt

B. One hundred volts

C. One thousand volts

D. One million volts

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T5B06 If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show?

A. 0.003 amperes

B. 0.3 amperes

C. 3 amperes

D. 3,000,000 amperes

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T5B12 Which of the following frequencies is equal to 28,400 kHz?

A. 28.400 MHz

B. 2.800 MHz

C. 284.00 MHz

D. 28.400 kHz

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T5B05 Which of the following is equivalent to 500 milliwatts?

A. 0.02 watts

B. 0.5 watts

C. 5 watts

D. 50 watts

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T5B01 How many milliamperes is 1.5 amperes?

A. 15 milliamperes

B. 150 milliamperes

C. 1,500 milliamperes

D. 15,000 milliamperes

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T5B08 How many microfarads are 1,000,000 picofarads?

A. 0.001 microfarads

B. 1 microfarad

C. 1000 microfarads

D. 1,000,000,000 microfarads

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T5B04 How many volts are equal to one microvolt?

A. One one-millionth of a volt

B. One million volts

C. One thousand kilovolts

D. One one-thousandth of a volt

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T7D08 Which of the following types of solder is best for radio and electronic use?

A. Acid-core solder

B. Silver solder

C. Rosin-core solder

D. Aluminum solder

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T7D09 What is the characteristic appearance of a "cold" solder joint?

A. Dark black spots

B. A bright or shiny surface

C. A grainy or dull surface

D. A greenish tint

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T7D07 Which of the following measurements are commonly made using a multimeter?

A. SWR and RF power

B. Signal strength and noise

C. Impedance and reactance

D. Voltage and resistance

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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

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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

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T7D10 What is probably happening when an ohmmeter, connected across an unpowered circuit, initially indicates a low resistance and then shows increasing resistance with time?

A. The ohmmeter is defective

B. The circuit contains a large capacitor

C. The circuit contains a large inductor

D. The circuit is a relaxation oscillator