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Technician Licensing Class Go Picture These! Section 10 Go Picture These! Schematic Symbols Go Picture These! • 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 Go Picture These! T6C2 Component 1 in figure T1 is a resistor. 3 Resistor 2 1 4 5 Figure T1 Go Picture These! • 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 Go Picture These! • T6C4 Component 3 in figure T1 is a lamp. Lamp 3 2 1 5 4 Figure T1 Go Picture These! • T6C5 Component 4 in figure T1 is a battery. Battery 3 2 1 5 4 Figure T1 Go Picture These! • Component 3 in figure T3 is a variable inductor. T6C10 4 2 1 3 Variable Inductor Figure T3 Go Picture These! • T6C11 Component 4 in figure T3 is an antenna. 4 2 1 3 Figure T3 Antenna Go Picture These! • 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 Go Picture These! T6C9 Component 4 in figure T2 is a transformer. 2 3 9 5 4 7 1 6 10 8 Figure T2 Transformer Go Picture These! • T6C6 Component 6 in figure T2 is a capacitor. 2 3 9 5 4 7 1 6 10 8 Figure T2 Capacitor Go Picture These! • 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 Go Picture These! • T6C8 Component 9 in figure T2 is a variable resistor. Variable Resistor 2 3 9 5 4 7 1 6 10 8 Figure T2 Go Picture These! • 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 Go Picture These! • A meter can be used to display signal strength on a numeric scale. T6D4 S-Meter Go Picture These! A switch controlled by an electromagnet best describes a relay. T6D2 Relays Electromagnets Go Picture These! • 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 Go Picture These! • 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 . Go Picture These! • 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. Go Picture These! 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 Go Picture These! 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 Go Picture These! • 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. Go Picture These! • • • • 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 Go Picture These! 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