Technicians Exam-Electrical Components

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rledwith
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Technicians Exam-Electrical Components
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2013-06-13 12:24:33
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Amateur Radio Technicians Exam - T6 Question Set - Electrical Components
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  1. T6A01 What electrical component is used to oppose the flow of current in a DC circuit?
    A. Inductor
    B. Resistor
    C. Voltmeter
    D. Transformer
    • B. Resistor
    • Resistors have a certain resistance specified in ohms (Ω), kilo-ohms (kΩ), or mega-ohms (MΩ). The function of a resistor is to oppose the flow of electrical current, just as a valve in a water pipe restricts the flow through the pipe. [Ham Radio License Manual, page 3-6]
  2. T6A02 What type of component is often used as an adjustable volume control?
    A. Fixed resistor
    B. Power resistor
    C. Potentiometer
    D. Transformer
    • C. Potentiometer
    • A variable resistor is also called a potentiometer (poh-ten-chee-AH-meh-tur) or pot because it is frequently used to adjust voltage or potential, such as for a volume control. [Ham Radio License Manual, page 3-8]
  3. T6A03 What electrical parameter is controlled by a potentiometer?
    A. Inductance
    B. Resistance
    C. Capacitance
    D. Field strength
    • B. Resistance
    • A variable resistor is also called a potentiometer (poh-ten-chee-AH-meh-tur) or pot because it is frequently used to adjust voltage or potential, such as for a volume control. [Ham Radio License Manual, page 3-8]
  4. T6A04 What electrical component stores energy in an electric field?
    A. Resistor
    B. Capacitor
    C. Inductor
    D. Diode
    • B. Capacitor
    • Capacitors store electrical energy in the electric field created by a voltage between two conducting surfaces (such as metal foil) called electrodes. The electrodes are separated by an insulator called the dielectric. (See question T5C01) [Ham Radio License Manual, page 3-6] *T5C01 - The ability to store energy in an electric field is called capacitance and it is measured in farads (F). Capacitors store electrical energy in the electric field created by a voltage between two conducting surfaces (such as metal foil) called electrodes. The electrodes are separated by an insulator called the dielectric. [Ham Radio License Manual, page 3-6]
  5. T6A05 What type of electrical component consists of two or more conductive surfaces separated by an insulator?
    A. Resistor
    B. Potentiometer
    C. Oscillator
    D. Capacitor
    • D. Capacitor
    • Capacitors store electrical energy in the electric field created by a voltage between two conducting surfaces (such as metal foil) called electrodes. The electrodes are separated by an insulator called the dielectric. (dB = 10 log (200 / 20) = 10 log (10) = 10 dB [Ham Radio License Manual, page 4-6]) [Ham Radio License Manual, page 3-6]
  6. T6A06 What type of electrical component stores energy in a magnetic field?
    A. Resistor
    B. Capacitor
    C. Inductor
    D. Diode
    • C. Inductor
    • Inductors store magnetic energy in the magnetic field created by current flowing through a wire. This is called inductance and it is measured in henrys (H). Inductors are made from wire wound in a coil, sometimes around a core of magnetic material that concentrates the magnetic energy. (See question T5C03) [Ham Radio License Manual, page 3-7] *T5C03 - Inductors store magnetic energy in the magnetic field created by current flowing through a wire. This property is called inductance and it is measured in henrys (H). [Ham Radio License Manual, page 3-7]
  7. T6A07 What electrical component is usually composed of a coil of wire?
    A. Switch
    B. Capacitor
    C. Diode
    D. Inductor
    • D. Inductor
    • Inductors store magnetic energy in the magnetic field created by current flowing through a wire. This is called inductance and it is measured in henrys (H). Inductors are made from wire wound in a coil, sometimes around a core of magnetic material that concentrates the magnetic energy. (See question T5C03.) [Ham Radio License Manual, page 3-7] *T5C03 - Inductors store magnetic energy in the magnetic field created by current flowing through a wire. This property is called inductance and it is measured in henrys (H). [Ham Radio License Manual, page 3-7]
  8. T6A08 What electrical component is used to connect or disconnect electrical circuits?
    A. Zener diode
    B. Switch
    C. Inductor
    D. Variable resistor
    • B. Switch
    • Switches and relays are simple components that control current through a circuit by connecting and disconnecting the paths current can follow. Both can interrupt current — called opening a circuit — or allow it to flow — called closing a circuit. [Ham Radio License Manual, page 3-11]
  9. T6A09 What electrical component is used to protect other circuit components from current overloads?
    A. Fuse
    B. Capacitor
    C. Shield
    D. Inductor
    • A. Fuse
    • Fuses interrupt current overloads by melting a short length of metal. When the metal melts or “blows,” the current path is broken and power is removed from circuits supplied by the fuse. [Ham Radio License Manual, page 3-11]
  10. T6A10 What is the nominal voltage of a fully charged nickel-cadmium cell?
    A. 1.0 volts
    B. 1.2 volts
    C. 1.5 volts
    D. 2.2 volts
    • B. 1.2 volts
    • As seen in the following table, nickel-cadmium (NiCd) cells have a nominal voltage of 1.2 V when fully charged. [Ham Radio License Manual, pages 5-16, 5-17]
  11. T6A11 Which battery type is not rechargeable?
    A. Nickel-cadmium
    B. Carbon-zinc
    C. Lead-acid
    D. Lithium-ion
    • B. Carbon-zinc
    • Carbon-zinc batteries are disposable, not rechargeable, as shown in the table of battery types and characteristics. [Ham Radio License Manual, page 5-16]
  12. T6B01 What class of electronic components is capable of using a voltage or current signal to control current flow?
    A. Capacitors
    B. Inductors
    C. Resistors
    D. Transistors
    • D. Transistors
    • Transistors are components made from patterns of N- and P-type semiconductor material creating by doping — the adding of impurities to change the way the material conducts electricity. The patterns form structures that allow the transistor to use small voltages and currents to control larger ones. The transistor’s electrodes are contacts made to a separate piece of the pattern. With the appropriate external circuit and a source of power, transistors can amplify or switch voltages and currents. Using small signals to control larger signals is called gain. [Ham Radio License Manual, page 3-10]
  13. T6B02 What electronic component allows current to flow in only one direction?
    A. Resistor
    B. Fuse
    C. Diode
    D. Driven Element
    • C. Diode
    • When N- and P-type material are placed in contact with each other, the result is a PN junction that conducts better in one direction than the other. This and other properties are used to create many useful electronic components, generally referred to as semiconductors. A semiconductor that only allows current flow in one direction is called a diode. Current flows from the anode to the cathode. [Ham Radio License Manual, page 3-10]
  14. T6B03 Which of these components can be used as an electronic switch or amplifier?
    A. Oscillator
    B. Potentiometer
    C. Transistor
    D. Voltmeter
    • C. Transistor
    • Transistors are components made from patterns of N- and P-type semiconductor material creating by doping — the adding of impurities to change the way the material conducts electricity. The patterns form structures that allow the transistor to use small voltages and currents to control larger ones. The transistor’s electrodes are contacts made to a separate piece of the pattern. With the appropriate external circuit and a source of power, transistors can amplify or switch voltages and currents. Using small signals to control larger signals is called gain. [Ham Radio License Manual, page 3-10]
  15. T6B04 Which of these components is made of three layers of semiconductor material?
    A. Alternator
    B. Bipolar junction transistor
    C. Triode
    D. Pentagrid converter
    • B. Bipolar junction transistor
    • There are two common types of transistors: bipolar junction transistors (BJT) and field-effect transistors (FET). The BJT is made from three alternating layers of N- and P-type material. The electrodes are called the base, emitter and collector. There are two types of BJT; NPN and PNP, referring to the arrangement of the layers. [Ham Radio License Manual, page 3-10]
  16. T6B05 Which of the following electronic components can amplify signals?
    A. Transistor
    B. Variable resistor
    C. Electrolytic capacitor
    D. Multi-cell battery
    • A. Transistor
    • Transistors are components made from patterns of N- and P-type semiconductor material creating by doping — the adding of impurities to change the way the material conducts electricity. The patterns form structures that allow the transistor to use small voltages and currents to control larger ones. The transistor’s electrodes are contacts made to a separate piece of the pattern. With the appropriate external circuit and a source of power, transistors can amplify or switch voltages and currents. Using small signals to control larger signals is called gain. [Ham Radio License Manual, page 3-10]
  17. T6B06 How is a semiconductor diode’s cathode lead usually identified?
    A. With the word “cathode”
    B. With a stripe
    C. With the letter “C”
    D. All of these choices are correct
    • B. With a stripe
    • Most semiconductor diode components are made with a protective coating around the actual semiconductor material. The electrodes are a pair of wire leads or tabs that make contact to the semiconductor material. Short of actually performing an electrical test, there is no way to tell the electrodes apart except for marking or labeling. The most common method is marking the body of the diode with a paint stripe to indicate the cathode electrode. [Ham Radio License Manual, page 3-10]
  18. T6B07 What does the abbreviation “LED” stand for?
    A. Low Emission Diode
    B. Light Emitting Diode
    C. Liquid Emission Detector
    D. Long Echo Delay
    • B. Light Emitting Diode
    • The light-emitting diode or LED, gives off light when current flows through it. [Ham Radio License Manual, page 3-10]
  19. T6B08 What does the abbreviation “FET” stand for?
    A. Field Effect Transistor
    B. Fast Electron Transistor
    C. Free Electron Transition
    D. Field Emission Thickness
    • A. Field Effect Transistor
    • The FET (or field effect transistor) is constructed as a conducting path or channel of N- or P-type material. The ends of the channel form the source and drain electrodes. The gate electrode is used to control current flow through the channel. [Ham Radio License Manual, page 3-10]
  20. T6B09 What are the names of the two electrodes of a diode?
    A. Plus and minus
    B. Source and drain
    C. Anode and cathode
    D. Gate and base
    • C. Anode and cathode
    • When N- and P-type material are placed in contact with each other, the result is a PN junction that conducts better in one direction than the other. This and other properties are used to create many useful electronic components, generally referred to as semiconductors. A semiconductor that only allows current flow in one direction is called a diode. Current flows from the anode to the cathode. [Ham Radio License Manual, page 3-10]
  21. T6B10 Which semiconductor component has an emitter electrode?
    A. Bipolar transistor
    B. Field effect transistor
    C. Silicon diode
    D. Bridge rectifier
    • A. Bipolar transistor
    • There are two common types of transistors: bipolar junction transistors (BJT) and field-effect transistors (FET). The BJT is made from three alternating layers of N- and P-type material. The electrodes are called the base, emitter and collector. There are two types of BJT; NPN and PNP, referring to the arrangement of the layers. [Ham Radio License Manual, page 3-10]
  22. T6B11 Which semiconductor component has a gate electrode?
    A. Bipolar transistor
    B. Field effect transistor
    C. Silicon diode
    D. Bridge rectifier
    • B. Field effect transistor
    • The FET (or field effect transistor) is constructed as a conducting path or channel of N- or P-type material. The ends of the channel form the source and drain electrodes. The gate electrode is used to control current flow through the channel. [Ham Radio License Manual, page 3-10]
  23. T6B12 What is the term that describes a transistor’s ability to amplify a signal?
    A. Gain
    B. Forward resistance
    C. Forward voltage drop
    D. On resistance
    • A. Gain
    • Transistors are components made from patterns of N- and P-type semiconductor material creating by doping — the adding of impurities to change the way the material conducts electricity. The patterns form structures that allow the transistor to use small voltages and currents to control larger ones. The transistor’s electrodes are contacts made to a separate piece of the pattern. With the appropriate external circuit and a source of power, transistors can amplify or switch voltages and currents. Using small signals to control larger signals is called gain. [Ham Radio License Manual, page 3-10]
  24. 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
    • C. Schematic symbols
    • If a circuit contains more than two or three components, trying to describe it clearly in words becomes very difficult. To describe complicated circuits, engineers have developed the schematic diagram or simply schematic. Schematics create a visual description of a circuit by using standardized representations of electrical components called circuit symbols. Figure T6-1 shows commonly used schematic symbols. [Ham Radio License Manual, pages 3-12, 3-13]C. Schematic symbols
  25. T6C02 What is component 1 in figure T1?
     
    A. Transistor
    B. Connector
    C. Resistor
    D. Battery
    C. Resistor
    (this multiple choice question has been scrambled)
  26. T6C03 What is component 2 in figure T1?

    A. Connector
    B. Transistor
    C. Indicator lamp
    D. Resistor
    B. Transistor
    (this multiple choice question has been scrambled)
  27. T6C04 What is component 3 in figure T1?

    A. Resistor
    B. Transistor
    C. Lamp
    D. Ground symbol
    C. Lamp
    (this multiple choice question has been scrambled)
  28. T6C05 What is component 4 in figure T1?

    A. Transistor
    B. Ground symbol
    C. Resistor
    D. Battery
    D. Battery
    (this multiple choice question has been scrambled)
  29. T6C06 What is component 6 in figure T2?

    A. Capacitor
    B. Regulator IC
    C. Resistor
    D. Transistor
    A. Capacitor
    (this multiple choice question has been scrambled)
  30. T6C07 What is component 8 in figure T2?

    A. Resistor
    B. Inductor
    C. Regulator IC
    D. Light emitting diode
    D. Light emitting diode
    (this multiple choice question has been scrambled)
  31. T6C08 What is component 9 in figure T2?

    A. Variable inductor
    B. Variable resistor
    C. Variable transformer
    D. Variable capacitor
    B. Variable resistor
    (this multiple choice question has been scrambled)
  32. T6C09 What is component 4 in figure T2?

    A. Potentiometer
    B. Transformer
    C. Double-pole switch
    D. Variable inductor
    B. Transformer
    (this multiple choice question has been scrambled)
  33. T6C10 What is component 3 in figure T3?

    A. Meter
    B. Variable inductor
    C. Connector
    D. Variable capacitor
    B. Variable inductor
    (this multiple choice question has been scrambled)
  34. T6C11 What is component 4 in figure T3?

    A. Ground
    B. Transmitter
    C. Antenna
    D. Dummy load
    C. Antenna
    (this multiple choice question has been scrambled)
  35. T6C12 What do the symbols on an electrical circuit schematic diagram represent?
    A. Electrical components
    B. Logic states
    C. Digital codes
    D. Traffic nodes
    • A. Electrical components
    • If a circuit contains more than two or three components, trying to describe it clearly in words becomes very difficult. To describe complicated circuits, engineers have developed the schematic diagram or simply schematic. Schematics create a visual description of a circuit by using standardized representations of electrical components called circuit symbols. Figure T6-1 shows commonly used schematic symbols. [Ham Radio License Manual, pages 3-12, 3-13]
  36. 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 are correct
    • C. The way components are interconnected
    • A schematic does not illustrate the actual physical layout of a circuit. (A pictorial diagram is used for that purpose.) It only shows how the components are connected electrically. The lines drawn from component to component represent those electrical connections. Each line does not necessarily correspond to a physical wire — it just indicates that an electrical connection exists between whatever is at each end of the line. [Ham Radio License Manual, page 3-12]
  37. T6D01 Which of the following devices or circuits changes an alternating current into a varying direct current signal?
    A. Transformer
    B. Rectifier
    C. Amplifier
    D. Reflector
    • B. Rectifier
    • Heavy-duty diodes that can withstand large voltages and currents are called rectifiers. If an ac voltage is applied to a diode, the result is a unidirectional, pulsing dc current because current is blocked when the voltage tries to push electrons in the “wrong” direction. (See question T6B02.) Circuits that change ac current into dc are also called rectifiers. [Ham Radio License Manual, page 3-10] *T6B02 - When N- and P-type material are placed in contact with each other, the result is a PN junction that conducts better in one direction than the other. This and other properties are used to create many useful electronic components, generally referred to as semiconductors. A semiconductor that only allows current flow in one direction is called a diode. Current flows from the anode to the cathode. [Ham Radio License Manual, page 3-10]
  38. 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
    • A. A switch controlled by an electromagnet
    • A switch is operated manually while a relay is a switch controlled by an electromagnet. [Ham Radio License Manual, page 3-12]
  39. T6D03 What type of switch is represented by item 3 in figure T2?

    A. Double-pole single-throw
    B. Single-pole single-throw
    C. Double-pole double-throw
    D. Single-pole double-throw
    B. Single-pole single-throw
    (this multiple choice question has been scrambled)
  40. T6D04 Which of the following can be used to display signal strength on a numeric scale?
    A. Potentiometer
    B. Transistor
    C. Meter
    D. Relay
    • C. Meter
    • Indicators and displays are important components for radio equipment. An indicator is either ON or OFF, such as a power indicator or a label that appears when you are transmitting. A meter provides information as a value in the form of numbers or on a numeric scale. [Ham Radio License Manual, page 3-12]
  41. T6D05 What type of circuit controls the amount of voltage from a power supply?
    A. Regulator
    B. Oscillator
    C. Filter
    D. Phase inverter
    • A. Regulator
    • A power supply’s output voltage changes with the amount of output current. The percentage of voltage change between zero current (no load) and maximum current (full load) is the regulation of the supply. To achieve “tight” regulation, meaning little variation as current changes, requires a regulator circuit in the supply. [Ham Radio License Manual, page 5-14]
  42. 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
    • B. Transformer
    • Transformers are made from two or more inductors that share their stored energy. This allows energy to be transferred from one inductor to another while changing the combination of voltage and current. A transformer is used to transfer energy from a home’s 120 V ac outlets to a lower voltage for use in electronic equipment. [Ham Radio License Manual, page 3-8]
  43. T6D07 Which of the following is commonly used as a visual indicator?
    A. LED
    B. FET
    C. Zener diode
    D. Bipolar transistor
    • A. LED
    • Indicators and displays are important components for radio equipment. An indicator is either ON or OFF, such as a power indicator or a label that appears when you are transmitting. A meter provides information as a value in the form of numbers or on a numeric scale. [Ham Radio License Manual, page 3-10]
  44. 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
    • D. Capacitor
    • Capacitors and inductors are used to create tuned circuits. A tuned circuit acts as a filter, passing or rejecting signals at its resonant frequency. Tuned circuits are important in radio because they help radios generate or receive signals at a single frequency. [Ham Radio License Manual, page 3-9]
  45. 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
    • C. Integrated circuit
    • An integrated circuit (IC or chip) is made of many components connected together as a useful circuit and packaged as a single component. ICs range from very simple circuits consisting of a few diodes all the way to complex microprocessors or signal-processing chips with many thousands of components. [Ham Radio License Manual, page 3-10]
  46. 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
    • C. Control the flow of current
    • Component 2 is a transistor that can act as a switch or amplifier. (See question T6B01 and Figure T6-1) [Ham Radio License Manual, page 3-10] *T6B01 - Transistors are components made from patterns of N- and P-type semiconductor material creating by doping — the adding of impurities to change the way the material conducts electricity. The patterns form structures that allow the transistor to use small voltages and currents to control larger ones. The transistor’s electrodes are contacts made to a separate piece of the pattern. With the appropriate external circuit and a source of power, transistors can amplify or switch voltages and currents. Using small signals to control larger signals is called gain. [Ham Radio License Manual, page 3-10]
  47. T6D11 Which of the following is a common use of coaxial cable?
    A. Carry dc power from a vehicle battery to a mobile radio
    B. Carry RF signals between a radio and antenna
    C. Secure masts, tubing, and other cylindrical objects on towers
    D. Connect data signals from a TNC to a computer
    • B. Carry RF signals between a radio and antenna
    • Coaxial cable is specially made to carry RF signals without allowing them to radiate or be affected by other signals. Materials that make up coaxial cable are chosen to minimize the amount of signal power lost as the signal travels through the cable. This makes coaxial cable an ideal choice to carry RF signals between a radio and an antenna. [Ham Radio License Manual, page 4-8]

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