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1 | Question | Answer | ||||||||||||||||||||||||
2 | Electrical current is measured in which of the following units? Choice A: Volts. Choice B: Watts. Choice C: Ohms. Choice D: Amperes. | Amperes | ||||||||||||||||||||||||
3 | Electrical power is measured in which of the following units? Choice A: Volts. Choice B: Watts. Choice C: Watt-hours. Choice D: Amperes. | Watts | ||||||||||||||||||||||||
4 | What is the term for the flow of electrons in an electric circuit? Choice A: Voltage. Choice B: Amperes per second. Choice C: Volts per second. Choice D: Current. | Current | ||||||||||||||||||||||||
5 | What term describes the number of times per second that an alternating current makes a complete cycle? Choice A: Pulse rate. Choice B: Wave number. Choice C: Frequency. Choice D: Wavelength. | Frequency | ||||||||||||||||||||||||
6 | A difference in which of the following causes electron flow? Choice A: Voltage. Choice B: Ampere-hours. Choice C: Capacitance. Choice D: Inductance. | Voltage | ||||||||||||||||||||||||
7 | What is the unit of frequency? Choice A: Hertz. Choice B: Henry. Choice C: Farad. Choice D: Epicycles per second. | Hertz | ||||||||||||||||||||||||
8 | Why are metals generally good conductors of electricity? Choice A: They have relatively high density. Choice B: They have many free electrons. Choice C: They have many free protons. Choice D: They have relatively high Young’s modulus values. | They have many free electrons | ||||||||||||||||||||||||
9 | Which of the following is a good electrical insulator? Choice A: Sea water. Choice B: Glass. Choice C: Stainless steel. Choice D: Graphite. | Glass | ||||||||||||||||||||||||
10 | Which of the following describes alternating current? Choice A: Current that alternates between a positive direction and zero. Choice B: Current that alternates between a negative direction and zero. Choice C: Current that alternates between positive and negative directions. Choice D: All these answers are correct. | Current that alternates between positive and negative directions | ||||||||||||||||||||||||
11 | Which term describes the rate at which electrical energy is used? Choice A: Resistance. Choice B: Current. Choice C: Power. Choice D: Voltage. | Power | ||||||||||||||||||||||||
12 | What type of current flow is opposed by resistance? Choice A: Direct current. Choice B: Alternating current. Choice C: RF current. Choice D: All these choices are correct. | All these choices are correct | ||||||||||||||||||||||||
13 | How many milliamperes is 1.5 amperes? Choice A: 0.0000015 milliamperes. Choice B: 0.0015 milliamperes. Choice C: 1500 milliamperes. Choice D: 1,500,000 milliamperes. | 1500 milliamperes | ||||||||||||||||||||||||
14 | Which is equal to 1,500,000 hertz? Choice A: 1500 kilohertz. Choice B: 1500 megahertz. Choice C: 15 gigahertz. Choice D: 150 kilohertz. | 1500 kilohertz | ||||||||||||||||||||||||
15 | Which is equal to one kilovolt? Choice A: One one-thousandth of a volt. Choice B: One hundred volts. Choice C: One thousand volts. Choice D: One million volts. | One thousand volts | ||||||||||||||||||||||||
16 | Which is equal to one microvolt? Choice A: One one-millionth of a volt. Choice B: One million volts. Choice C: One thousand kilovolts. Choice D: One one-thousandth of a volt. | One one-millionth of a volt | ||||||||||||||||||||||||
17 | Which is equal to 500 milliwatts? Choice A: 5 watts. Choice B: 0.5 watts. Choice C: 500,000 watts. Choice D: 500,000,000 watts. | 0.5 watts | ||||||||||||||||||||||||
18 | Which is equal to 3000 milliamperes? Choice A: 0.003 amperes. Choice B: 0.3 amperes. Choice C: 3,000,000 amperes. Choice D: 3 amperes. | 3 amperes | ||||||||||||||||||||||||
19 | Which is equal to 3.525 megahertz? Choice A: 0.003525 kilohertz. Choice B: 35.25 kilohertz. Choice C: 3525 kilohertz. Choice D: 3,525,000 kilohertz. | 3525 kilohertz | ||||||||||||||||||||||||
20 | Which is equal to 1,000,000 picofarads? Choice A: 0.001 microfarads. Choice B: 1 microfarad. Choice C: 1000 microfarads. Choice D: 1,000,000,000 microfarads. | 1 microfarad | ||||||||||||||||||||||||
21 | Which decibel value most closely represents a power increase from 5 watts to 10 watts? Choice A: 2 decibels. Choice B: 3 decibels. Choice C: 5 decibels. Choice D: 10 decibels. | 3 decibels | ||||||||||||||||||||||||
22 | Which decibel value most closely represents a power decrease from 12 watts to 3 watts? Choice A: -1 decibels. Choice B: -3 decibels. Choice C: -6 decibels. Choice D: -9 decibels. | -6 decibels | ||||||||||||||||||||||||
23 | Which decibel value represents a power increase from 20 watts to 200 watts? Choice A: 10 decibels. Choice B: 12 decibels. Choice C: 18 decibels. Choice D: 28 decibels. | 10 decibels | ||||||||||||||||||||||||
24 | Which is equal to 28400 kilohertz? Choice A: 28.400 kilohertz. Choice B: 2.800 megahertz. Choice C: 284.00 megahertz. Choice D: 28.400 megahertz. | 28.400 megahertz | ||||||||||||||||||||||||
25 | Which is equal to 2425 megahertz? Choice A: 0.002425 gigahertz. Choice B: 24.25 gigahertz. Choice C: 2.425 gigahertz. Choice D: 242.5 gigahertz. | 2.425 gigahertz | ||||||||||||||||||||||||
26 | What describes the ability to store energy in an electric field? Choice A: Inductance. Choice B: Resistance. Choice C: Frequency. Choice D: Capacitance. | Capacitance | ||||||||||||||||||||||||
27 | What is the unit of capacitance? Choice A: Farad. Choice B: Ohm. Choice C: Volt. Choice D: Henry. | Farad | ||||||||||||||||||||||||
28 | What describes the ability to store energy in a magnetic field? Choice A: Admittance. Choice B: Capacitance. Choice C: Resistance. Choice D: Inductance. | Inductance | ||||||||||||||||||||||||
29 | What is the unit of inductance? Choice A: Coulomb. Choice B: Farad. Choice C: Henry. Choice D: Ohm. | Henry | ||||||||||||||||||||||||
30 | What is the unit of impedance? Choice A: Volt. Choice B: Ampere. Choice C: Coulomb. Choice D: Ohm. | Ohm | ||||||||||||||||||||||||
31 | What is the abbreviation for kilohertz? Choice A: kilohertz. Choice B: khz. Choice C: KHz. Choice D: KHZ. | kilohertz | ||||||||||||||||||||||||
32 | What is the abbreviation for megahertz? Choice A: mHz. Choice B: mHZ. Choice C: Mhz. Choice D: megahertz. | megahertz | ||||||||||||||||||||||||
33 | What formula is used to calculate electrical power (P) in a DC circuit? Choice A: P equals I times E. Choice B: P equals E divided by I. Choice C: P equals I squared times E. Choice D: P equals I divided by E. | P equals I times E | ||||||||||||||||||||||||
34 | How much power is delivered by a voltage of 13.8 volts DC and a current of 10 amperes? Choice A: 138 watts. Choice B: 0.7 watts. Choice C: 23.8 watts. Choice D: 3.8 watts. | 138 watts | ||||||||||||||||||||||||
35 | How much power is delivered by a voltage of 12 volts DC and a current of 2.5 amperes? Choice A: 4.8 watts. Choice B: 30 watts. Choice C: 14.5 watts. Choice D: 0.208 watts. | 30 watts | ||||||||||||||||||||||||
36 | How much current is required to deliver 120 watts at a voltage of 12 volts DC? Choice A: 0.1 amperes. Choice B: 10 amperes. Choice C: 12 amperes. Choice D: 132 amperes. | 10 amperes | ||||||||||||||||||||||||
37 | What is impedance? Choice A: The opposition to AC current flow. Choice B: The inverse of resistance. Choice C: The inverse of reactance. Choice D: The power handling capability of a component. | The opposition to AC current flow | ||||||||||||||||||||||||
38 | What formula is used to calculate current in a circuit? Choice A: I equals E times R. Choice B: I equals E divided by R. Choice C: I equals E squared times R. Choice D: I equals E squared divided by R. | I equals E divided by R | ||||||||||||||||||||||||
39 | What formula is used to calculate voltage in a circuit? Choice A: E equals I times R. Choice B: E equals I divided by R. Choice C: E equals I squared times R. Choice D: E equals I squared divided by R. | E equals I times R | ||||||||||||||||||||||||
40 | What formula is used to calculate resistance in a circuit? Choice A: R equals E times I. Choice B: R equals E divided by I. Choice C: R = E + I. Choice D: R = E - I. | R equals E divided by I | ||||||||||||||||||||||||
41 | What is the resistance of a circuit in which a current of 3 amperes flows when connected to 90 volts? Choice A: 3 ohms. Choice B: 30 ohms. Choice C: 1/30 ohm. Choice D: 270 ohms. | 30 ohms | ||||||||||||||||||||||||
42 | What is the resistance of a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes? Choice A: 18 ohms. Choice B: 0.125 ohms. Choice C: 8 ohms. Choice D: 13.5 ohms. | 8 ohms | ||||||||||||||||||||||||
43 | What is the resistance of a circuit that draws 4 amperes from a 12-volt source? Choice A: 3 ohms. Choice B: 16 ohms. Choice C: 48 ohms. Choice D: 8 ohms. | 3 ohms | ||||||||||||||||||||||||
44 | What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? Choice A: 9600 amperes. Choice B: 200 amperes. Choice C: 0.667 amperes. Choice D: 1.5 amperes. | 1.5 amperes | ||||||||||||||||||||||||
45 | What is the current through a 100-ohm resistor connected across 200 volts? Choice A: 20,000 amperes. Choice B: 0.5 amperes. Choice C: 2 amperes. Choice D: 100 amperes. | 2 amperes | ||||||||||||||||||||||||
46 | What is the current through a 24-ohm resistor connected across 240 volts? Choice A: 2400 amperes. Choice B: 0.1 amperes. Choice C: 10 amperes. Choice D: 5760 amperes. | 10 amperes | ||||||||||||||||||||||||
47 | What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it? Choice A: 1 volt. Choice B: 0.25 volts. Choice C: 2.5 volts. Choice D: 1.5 volts. | 1 volt | ||||||||||||||||||||||||
48 | What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it? Choice A: 1 volt. Choice B: 10 volts. Choice C: 11 volts. Choice D: 9 volts. | 10 volts | ||||||||||||||||||||||||
49 | What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it? Choice A: 8 volts. Choice B: 0.2 volts. Choice C: 12 volts. Choice D: 20 volts. | 20 volts | ||||||||||||||||||||||||
50 | In which type of circuit is the current always the same through all components? Choice A: Series. Choice B: Parallel. Choice C: Resonant. Choice D: Branch. | Series | ||||||||||||||||||||||||
51 | In which type of circuit is the voltage always the same across all components? Choice A: Series. Choice B: Parallel. Choice C: Resonant. Choice D: Branch. | Parallel | ||||||||||||||||||||||||
52 | What electrical component opposes the flow of current in a DC circuit? Choice A: Inductor. Choice B: Resistor. Choice C: Inverter. Choice D: Transformer. | Resistor | ||||||||||||||||||||||||
53 | What type of component is often used as an adjustable volume control? Choice A: Fixed resistor. Choice B: Power resistor. Choice C: Potentiometer. Choice D: Transformer. | Potentiometer | ||||||||||||||||||||||||
54 | What electrical parameter is controlled by a potentiometer? Choice A: Inductance. Choice B: Resistance. Choice C: Capacitance. Choice D: Field strength. | Resistance | ||||||||||||||||||||||||
55 | What electrical component stores energy in an electric field? Choice A: Resistor. Choice B: Capacitor. Choice C: Inductor. Choice D: Diode. | Capacitor | ||||||||||||||||||||||||
56 | What type of electrical component consists of conductive surfaces separated by an insulator? Choice A: Resistor. Choice B: Potentiometer. Choice C: Oscillator. Choice D: Capacitor. | Capacitor | ||||||||||||||||||||||||
57 | What type of electrical component stores energy in a magnetic field? Choice A: Resistor. Choice B: Capacitor. Choice C: Inductor. Choice D: Diode. | Inductor | ||||||||||||||||||||||||
58 | What electrical component is typically constructed as a coil of wire? Choice A: Transistor. Choice B: Capacitor. Choice C: Diode. Choice D: Inductor. | Inductor | ||||||||||||||||||||||||
59 | What is the function of an SPDT switch? Choice A: A single circuit is opened or closed. Choice B: Two circuits are opened or closed. Choice C: A single circuit is switched between one of two other circuits. Choice D: Two circuits are each switched between one of two other circuits. | A single circuit is switched between one of two other circuits | ||||||||||||||||||||||||
60 | Which of the following battery chemistries is rechargeable? Choice A: Nickel-metal hydride. Choice B: Lithium-ion. Choice C: Lead-acid. Choice D: All these choices are correct. | All these choices are correct | ||||||||||||||||||||||||
61 | Which of the following battery chemistries is not rechargeable? Choice A: Nickel-cadmium. Choice B: Carbon-zinc. Choice C: Lead-acid. Choice D: Lithium-ion. | Carbon-zinc | ||||||||||||||||||||||||
62 | Which is true about forward voltage drop in a diode? Choice A: It is lower in some diode types than in others. Choice B: It is proportional to peak inverse voltage. Choice C: It indicates that the diode is defective. Choice D: It has no impact on the voltage delivered to the load. | It is lower in some diode types than in others | ||||||||||||||||||||||||
63 | What electronic component allows current to flow in only one direction? Choice A: Resistor. Choice B: Fuse. Choice C: Diode. Choice D: Driven element. | Diode | ||||||||||||||||||||||||
64 | Which of these components can be used as an electronic switch? Choice A: Varistor. Choice B: Potentiometer. Choice C: Transistor. Choice D: Thermistor. | Transistor | ||||||||||||||||||||||||
65 | Which of the following components can consist of three regions of semiconductor material? Choice A: Alternator. Choice B: Transistor. Choice C: Triode. Choice D: Pentode. | Transistor | ||||||||||||||||||||||||
66 | What type of transistor has a gate, drain, and source? Choice A: Varistor. Choice B: Field-effect. Choice C: Hall-effect. Choice D: Bipolar junction. | Field-effect | ||||||||||||||||||||||||
67 | How is the cathode lead of a semiconductor diode often marked on the package? Choice A: With the word "cathode". Choice B: With a stripe. Choice C: With the letter C. Choice D: With the letter K. | With a stripe | ||||||||||||||||||||||||
68 | What causes a light-emitting diode (LED) to emit light? Choice A: Forward current. Choice B: Reverse current. Choice C: Capacitively-coupled RF signal. Choice D: Inductively-coupled RF signal. | Forward current | ||||||||||||||||||||||||
69 | What does the abbreviation FET stand for? Choice A: Frequency Emission Transmitter. Choice B: Fast Electron Transistor. Choice C: Free Electron Transmitter. Choice D: Field Effect Transistor. | Field Effect Transistor | ||||||||||||||||||||||||
70 | What are the names for the electrodes of a diode? Choice A: Plus and minus. Choice B: Source and drain. Choice C: Anode and cathode. Choice D: Gate and base. | Anode and cathode | ||||||||||||||||||||||||
71 | Which of the following can provide power gain? Choice A: Transformer. Choice B: Transistor. Choice C: Reactor. Choice D: Resistor. | Transistor | ||||||||||||||||||||||||
72 | What does the term gain mean in amplifiers? Choice A: The output signal voltage relative to the input signal voltage. Choice B: The output signal current relative to the input signal current. Choice C: The output signal power relative to the input signal power. Choice D: All these choices are correct. | All these choices are correct | ||||||||||||||||||||||||
73 | What are the names of the electrodes of a bipolar junction transistor? Choice A: Signal, bias, power. Choice B: Emitter, base, collector. Choice C: Input, output, supply. Choice D: Pole one, pole two, output. | Emitter, base, collector | ||||||||||||||||||||||||
74 | What is an electrical diagram using standard component symbols called? Choice A: Connection chart. Choice B: Instrumentation system. Choice C: Schematic. Choice D: Flow chart. | Schematic | ||||||||||||||||||||||||
75 | Which of the following is accurately represented in electrical schematics? Choice A: Wire lengths. Choice B: Physical appearance of components. Choice C: Component connections. Choice D: All these choices are correct. | Component connections | ||||||||||||||||||||||||
76 | Which of the following devices or circuits changes an alternating current into a varying direct current signal? Choice A: Transformer. Choice B: Rectifier. Choice C: Amplifier. Choice D: Reflector. | Rectifier | ||||||||||||||||||||||||
77 | What is a relay? Choice A: An electrically-controlled switch. Choice B: A current-controlled amplifier. Choice C: An inverting amplifier. Choice D: A pass transistor. | An electrically-controlled switch | ||||||||||||||||||||||||
78 | Which of the following is a reason to use shielded wire? Choice A: To decrease the resistance of DC power connections. Choice B: To increase the current carrying capability of the wire. Choice C: To prevent coupling of unwanted signals to or from the wire. Choice D: To reduce receiver overload. | To prevent coupling of unwanted signals to or from the wire | ||||||||||||||||||||||||
79 | Which of the following displays an electrical quantity as a numeric value? Choice A: Potentiometer. Choice B: Transistor. Choice C: Meter. Choice D: Relay. | Meter | ||||||||||||||||||||||||
80 | What type of circuit controls the amount of voltage from a power supply? Choice A: Regulator. Choice B: Oscillator. Choice C: Filter. Choice D: Phase inverter. | Regulator | ||||||||||||||||||||||||
81 | What component changes 120 V AC power to a lower AC voltage for other uses? Choice A: Variable capacitor. Choice B: Transformer. Choice C: Transistor. Choice D: Diode. | Transformer | ||||||||||||||||||||||||
82 | Which of the following is commonly used as a visual indicator? Choice A: LED. Choice B: FET. Choice C: Zener diode. Choice D: All these choices are correct. | LED | ||||||||||||||||||||||||
83 | Which of the following is combined with an inductor to make a resonant circuit? Choice A: Resistor. Choice B: Zener diode. Choice C: Potentiometer. Choice D: Capacitor. | Capacitor | ||||||||||||||||||||||||
84 | What is the name of a device that combines several semiconductors and other components into one package? Choice A: Transducer. Choice B: Multi-pole relay. Choice C: Integrated circuit. Choice D: Transformer. | Integrated circuit | ||||||||||||||||||||||||
85 | Which of the following is a resonant or tuned circuit? Choice A: An inductor and a capacitor in series or parallel. Choice B: A linear voltage regulator. Choice C: A resistor circuit used for reducing standing wave ratio. Choice D: A circuit designed to provide high-fidelity audio. | An inductor and a capacitor in series or parallel | ||||||||||||||||||||||||
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