Ham Tech License

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Ham Tech License
2011-05-05 19:51:29
Ham License Questions

Study cards for Ham Tech License Part 3
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  1. What electrical component is used to oppose the flow of current in a DC circuit?
  2. What type of component is often used as an adjustable volume control?
  3. What electrical parameter is controlled by a potentiometer?
  4. What electrical component stores energy in an electric field?
  5. What type of electrical component consists of two or more conductive surfaces separated by an insulator?
  6. What type of electrical component stores energy in a magnetic field?
  7. What electrical component is usually composed of a coil of wire?
  8. What electrical component is used to connect or disconnect electrical circuits?
  9. What electrical component is used to protect other circuit components from current overloads?
  10. What is the nominal voltage of a fully charged nickel-cadmium cell?
    1.2 volts
  11. Which battery type is not rechargeable?
  12. What class of electronic components is capable of using a voltage or current signal to control current flow?
  13. What electronic component allows current to flow in only one direction?
  14. Which of these components can be used as an electronic switch or amplifier?
  15. Which of these components is made of three layers of semiconductor material?
    Bipolar junction transistor
  16. Which of the following electronic components can amplify signals?
  17. How is a semiconductor diode’s cathode lead usually identified?
    With a stripe
  18. What does the abbreviation "LED" stand for?
    Light Emitting Diode
  19. What does the abbreviation "FET" stand for?
    Field Effect Transistor
  20. What are the names of the two electrodes of a diode?
    Anode and cathode
  21. Which semiconductor component has an emitter electrode?
    Bipolar transistor
  22. Which semiconductor component has a gate electrode?
    Field effect transistor
  23. What is the term that describes a transistor's ability to amplify a signal?
  24. What do the symbols on an electrical circuit schematic diagram represent?
    Electrical components
  25. Which of the following is accurately represented in electrical circuit schematic diagrams?
    The way components are interconnected
  26. Which of the following devices or circuits changes an alternating current into a varying direct current signal?
  27. What best describes a relay?
    A switch controlled by an electromagnet
  28. What type of switch is represented by item 3 in figure T2?
    Single-pole single-throw
  29. Which of the following can be used to display signal strength on a numeric scale?
  30. What type of circuit controls the amount of voltage from a power supply?
  31. What component is commonly used to change 120V AC house current to a lower AC voltage for other uses?
  32. Which of the following is commonly used as a visual indicator?
  33. What of the following is used together with an inductor to make a tuned circuit?
  34. What is the name of a device that combines several semiconductors and other components into one package?
    Integrated circuit
  35. What is the function of component 2 in Figure T1?
    Control the flow of current
  36. What of the following is a common use of coaxial cable?
    Carry RF signals between a radio and antenna
  37. What is the function of a product detector?
    Detect CW and SSB signals
  38. What type of receiver is shown in Figure T6?
    Single-conversion superheterodyne
  39. What is the function of a mixer in a superheterodyne receiver?
    To shift the incoming signal to an intermediate frequency
  40. What circuit is pictured in Figure T7, if block 1 is a frequency discriminator?
    An FM receiver
  41. What is the function of block 1 if figure T4 is a simple CW transmitter?
  42. What device takes the output of a low-powered 28 MHz SSB exciter and produces a 222 MHz output signal?
  43. If figure T5 represents a transceiver in which block 1 is the transmitter portion and block 3 is the receiver portion, what is the function of block 2?
    A transmit-receive switch
  44. Which of the following circuits combines a speech signal and an RF carrier?
  45. Which of the following devices is most useful for VHF weak-signal communication?
    A multi-mode VHF transceiver
  46. What device increases the low-power output from a handheld transceiver?
    An RF power amplifier
  47. Which of the following circuits demodulates FM signals?
  48. Which term describes the ability of a receiver to discriminate between multiple signals?
  49. Where is an RF preamplifier installed?
    Between the antenna and receiver
  50. What can you do if you are told your FM handheld or mobile transceiver is over deviating?
    Talk farther away from the microphone
  51. What is meant by fundamental overload in reference to a receiver?
    Interference caused by very strong signals
  52. Which of the following may be a cause of radio frequency interference?
    Fundamental overload, Harmonics, Spurious emissions."All of these choices are correct"
  53. What is the most likely cause of interference to a telephone from a nearby transmitter?
    The telephone is inadvertently acting as a radio receiver
  54. What is a logical first step when attempting to cure a radio frequency interference problem in a nearby telephone?
    Install an RF filter at the telephone
  55. What should you do first if someone tells you that your transmissions are interfering with their radio or TV reception?
    Make sure that your station is operating properly and that it does not cause interference to your own television
  56. Which of the following may be useful in correcting a radio frequency interference problem?
    Snap-on ferrite chokes, Low-pass and high-pass filters, Band-reject and band-pass filters "All of these choices are correct"
  57. What should you do if a "Part 15" device in your neighbor’s home is causing harmful interference to your amateur station?
    Work with your neighbor to identify the offending device, Politely inform your neighbor about the rules that require him to stop using the device if it causes interference, Check your station and make sure it meets the standards of good amateur practice "All of these choices are correct"
  58. What could be happening if another operator reports a variable high-pitched whine on the audio from your mobile transmitter?
    Noise on the vehicle’s electrical system is being transmitted along with your speech audio
  59. What might be the problem if you receive a report that your signal through the repeater is distorted or unintelligible?
    Your transmitter may be slightly off frequency, Your batteries may be running low, You could be in a bad location, "All of these choices are correct"
  60. What is a symptom of RF feedback in a transmitter or transceiver?
    Reports of garbled, distorted, or unintelligible transmissions
  61. What does the acronym "BER" mean when applied to digital communications systems?
    Bit Error Rate
  62. What is the primary purpose of a dummy load?
    To prevent the radiation of signals when making tests
  63. Which of the following instruments can be used to determine if an antenna is resonant at the desired operating frequency?
    An antenna analyzer
  64. What, in general terms, is standing wave ratio (SWR)?
    A measure of how well a load is matched to a transmission line
  65. What reading on an SWR meter indicates a perfect impedance match between the antenna and the feedline?
    1 to 1
  66. What is the approximate SWR value above which the protection circuits in most solid-state transmitters begin to reduce transmitter power?
    2 to 1
  67. What does an SWR reading of 4:1 mean?
    An impedance mismatch
  68. What happens to power lost in a feedline?
    It is converted into heat
  69. What instrument other than an SWR meter could you use to determine if a feedline and antenna are properly matched?
    Directional wattmeter
  70. Which of the following is the most common cause for failure of coaxial cables?
    Moisture contamination
  71. Why should the outer jacket of coaxial cable be resistant to ultraviolet light?
    Ultraviolet light can damage the jacket and allow water to enter the cable
  72. What is a disadvantage of "air core" coaxial cable when compared to foam or solid dielectric types?
    It requires special techniques to prevent water absorption
  73. Which instrument would you use to measure electric potential or electromotive force?
    A voltmeter
  74. What is the correct way to connect a voltmeter to a circuit?
    In parallel with the circuit
  75. How is an ammeter usually connected to a circuit?
    In series with the circuit
  76. Which instrument is used to measure electric current?
    An ammeter
  77. What instrument is used to measure resistance?
    An ohmmeter
  78. Which of the following might damage a multimeter?
    Attempting to measure voltage when using the resistance setting
  79. Which of the following measurements are commonly made using a multimeter?
    Voltage and resistance
  80. Which of the following types of solder is best for radio and electronic use?
    Rosin-core solder
  81. What is the characteristic appearance of a "cold" solder joint?
    A grainy or dull surface
  82. What is probably happening 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
  83. Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter?
    Ensure that the circuit is not powered
  84. Which of the following is a form of amplitude modulation?
    Single sideband
  85. What type of modulation is most commonly used for VHF packet radio transmissions?
  86. Which type of voice modulation is most often used for long-distance or weak signal contacts on the VHF and UHF bands?
  87. Which type of modulation is most commonly used for VHF and UHF voice repeaters?
  88. Which of the following types of emission has the narrowest bandwidth?
  89. Which sideband is normally used for 10 meter HF, VHF and UHF single-sideband communications?
    Upper sideband
  90. What is the primary advantage of single sideband over FM for voice transmissions?
    SSB signals have narrower bandwidth
  91. What is the approximate bandwidth of a single sideband voice signal?
    3 kHz
  92. What is the approximate bandwidth of a VHF repeater FM phone signal?
    Between 5 and 15 kHz
  93. What is the typical bandwidth of analog fast-scan TV transmissions on the 70 cm band?
    About 6 MHz
  94. What is the approximate maximum bandwidth required to transmit a CW signal?
    150 Hz
  95. Who may be the control operator of a station communicating through an amateur satellite or space station?
    Any amateur whose license privileges allow them to transmit on the satellite uplink frequency
  96. How much transmitter power should be used on the uplink frequency of an amateur satellite or space station?
    The minimum amount of power needed to complete the contact
  97. Which of the following can be done using an amateur radio satellite?
    Talk to amateur radio operators in other countries
  98. Which amateur stations may make contact with an amateur station on the International Space Station using amateur radio frequencies?
    Any amateur holding a Technician or higher class license
  99. What is a satellite beacon?
    A transmission from a space station that contains information about a satellite
  100. What can be used to determine the time period during which an amateur satellite or space station can be accessed?
    A satellite tracking program
  101. What is Doppler shift?
    A change in signal frequency caused by motion of the transmitting station
  102. What is meant by the statement that a satellite is operating in "mode U/V"?
    The satellite uplink is in the 70 cm band and the downlink is in the 2 meter band
  103. What causes "spin fading" when referring to satellite signals?
    Rotation of the satellite and its antennas
  104. What do the initials LEO tell you about an amateur satellite?
    The satellite is in a Low Earth Orbit
  105. What is a commonly used method of sending signals to and from a digital satellite?
    FM Packet
  106. Which of the following methods is used to locate sources of noise interference or jamming?
    Radio direction finding
  107. Which of these items would be useful for a hidden transmitter hunt?
    A directional antenna
  108. What popular operating activity involves contacting as many stations as possible during a specified period of time?
  109. Which of the following is good procedure when contacting another station in a radio contest?
    Send only the minimum information needed for proper identification and the contest exchange
  110. What is a grid locator?
    A letter-number designator assigned to a geographic location
  111. For what purpose is a temporary "1 by 1" format (letter-number-letter) call sign assigned?
    For operations in conjunction with an activity of special significance to the amateur community
  112. What is the maximum power allowed when transmitting telecommand signals to radio controlled models?
    1 watt
  113. What is required in place of on-air station identification when sending signals to a radio control model using amateur frequencies?
    A label indicating the licensee's call sign and address must be affixed to the transmitter
  114. How might you obtain a list of active nodes that use VoIP?
    From a repeater directory
  115. How do you select a specific IRLP node when using a portable transceiver?
    Use the keypad to transmit the IRLP node ID
  116. What name is given to an amateur radio station that is used to connect other amateur stations to the Internet?
    A gateway
  117. Which of the following is an example of a digital communications method?
    Packet PSK31 MFSK "All of these choices are correct"
  118. What does the term APRS mean?
    Automatic Position Reporting System