Module 17

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bugsbunny2255
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193100
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Module 17
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2013-01-30 15:35:55
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  1. For naval communications to be effective, all involved must be top performers. Reliable, secure, and timely receiving and transmitting of information is the goal. Which standard are used to determine whether or not this goal has been met?
    Wartime
  2. What are the two types of electrical communications?
    Radio and wire
  3. Which of the following terms includes intelligence produced by wire, radio,visual means, oral means or electromagnetic systems?
    Telecommunications
  4. Radiotelegraph (cw) is valuable when communicating to, from, and among widely separated naval units. What is the main advantage of the cw mode?
    Reliability
  5. Tactical communications is usually considered as line-of-sight. What maximum distance is normally within the line-of-sight range?
    25 miles
  6. You want to transmit high-speed automatic page or tape copy across an ocean area. Which method should you choose?
    Radioteletypewriter
  7. What method is normally used to transmit graphs electronically?
    Facsimile
  8. When you use subdivisions to assign reference designators to equipment, what is the designator of (a) the largest and (b)the smallest?
    System and part.
  9. When using the reference designator1A6A4J6, what level does the number 1 refer to?
    Unit
  10. What is the total number of frequency bands the military is currently using for communications?
    9
  11. Extremely low-frequency transmissions are primarily directed at which of the following users?
    Submarines
  12. Vlf transmitters are used primarily for which of the following purposes?
    Navigation and fleet communications
  13. Navy use of the low-frequency band is mainly for which, if any, of the following broadcasts?
    Northern Latitudes
  14. For which reason does the Navy use only the upper and lower ends of the mf band?
    The commercial AM band occupies the middle.
  15. Hf communications over long-distance trunks, or links between fixed terminals are examples of which type of systems?
    Point-to-point
  16. Sending a message on several frequencies at once is an example of which of the following transmission types?
    Frequency-diversity
  17. What type of diversity uses physically separated transmit or receive antennas to improve communications?
    Space
  18. Normally the transmission range of vhf is limited to line of sight. What technique is used to increase this range?
    Tropospheric scatter
  19. A complex of links make up a major communications system. The naval communications system is further broken down into what two groups?
    Strategic and tactical
  20. Communications links have many modes of operation. One terminal in a link has its equipment setup in simplex. The other terminal is using two channels or frequencies in a configuration that allows sending and receiving of different messages at the same time. These two terminals working together make up what mode of operation?
    Semiduplex
  21. What communications link mode of operation provides telecommunications capability between stations at the same time in both directions?
    Duplex
  22. Aid in restoring downed fleet communications channels is furnished on a not-to-interfere basis by which of the following networks?
    HICOM
  23. Which switched networks extends tactical voice to shore based operational commands?
    NORATS
  24. For naval communications to be effective, all involved must be top performers. Reliable, secure, and timely receiving and transmitting of information is the goal. Which of the following requirement standards are used to determine whether or not this goal has been met?
    Wartime
  25. What are the two types of electrical communications?
    Radio and wire
  26. Which of the following terms includes intelligence produced by wire, radio,visual means, oral means or electromagnetic systems?
    Telecommunications
  27. Radiotelegraph (cw) is valuable when communicating to, from, and among widely separated naval units. What is the main advantage of the cw mode?
    Reliability
  28. Tactical communications is usually considered as line-of-sight. What maximum distance is normally within the line-of-sight range?
    25 miles
  29. You want to transmit high-speed automatic page or tape copy across anocean area. Which of the following methods should you choose?
    Radioteletypewriter
  30. What method is normally used to transmit graphs electronically?
    Facsimile
  31. When you use subdivisions to assign reference designators to equipment, what is the designator of (a) the largest and (b)the smallest?
    System and Part
  32. When using the reference designator1A6A4J6, what level does the number 1refer to?
    Unit
  33. What is the total number of frequency bands the military is currently using for communications?
    9
  34. Extremely low-frequency transmissions are primarily directed at which of the following users?
    Submarines
  35. Vlf transmitters are used primarily for which of the following purposes?
    Navigation and fleet communications
  36. Navy use of the low-frequency band is mainly for which, if any, of the following broadcasts?
    Northern Latitudes
  37. For which of the following reasons does the Navy use only the upper and lower ends of the mf band?
    The commercial AM band occupies the middle
  38. Hf communications over long-distance trunks, or links between fixed terminals are examples of which of the following types of systems?
    Point-to-point
  39. Sending a message on several frequencies at once is an example of which of the following transmission types?
    Frequency-diversity
  40. What type of diversity uses physically separated transmit or receive antennas to improve communications?
    Space
  41. Normally the transmission range of vhf is limited to line of sight. What technique is used to increase this range?
    Tropospheric scatter
  42. A complex of links make up a major communications system. The naval communications system is further broken down into what two groups?
    Strategic and tactical
  43. Communications links have many modes of operation. One terminal in a link has its equipment setup in simplex. The other terminal is using two channels or frequencies in a configuration that allows sending and receiving of different messages at the same time. These two terminals working together make up what mode of operation?
    Semiduplex
  44. What communications link mode of operation provides telecommunications capability between stations at the same time in both directions?
    Duplex
  45. Aid in restoring downed fleet communications channels is furnished on a not-to-interfere basis by which of the following networks?
    HICOM (High Command Communication)
  46. Which of the following switched networks extends tactical voice to shore based operational commands?
    NORATS
  47. Of the following transmitter types, which are used for basic communications?
    Cw, AM, fm, and ssb
  48. Cw transmissions have narrow bandwidths and a high degree of intelligibility under severe noise conditions. What is the primary Navy use for cw?
    Radioteletypewriter
  49. A cw transmitter must contain which of the following components?
    A keyer
  50. In a cw transmitter, a buffer stage performs which of the following functions?
    Voltage amplifier
  51. There are differences between low- and high-power transmitters. The main difference is the high power transmitter contains a larger number of which of the following types of amplifiers?
    Intermediate power
  52. In an AM transmitter, audio frequencies are converted into corresponding electrical energy by which of the following components?
    A microphone
  53. In an fm transmitter, a varicap performs which of the following functions?
    It varies the oscillator frequency
  54. If an oscillator has a fundamental frequency of 3,550 megahertz, what is the frequency of the third harmonic?
    10,650 megahertz
  55. If the fundamental frequency of an rf carrier is 1,000 kilohertz, what is the frequency of the fourth subharmonic?
    250 kilohertz
  56. Oscillator output frequencies are raised to usable values by frequency multipliers. To raise an oscillator frequency from 20 megahertz to 120megahertz, what combination of frequency multipliers would be used?
    A doubler and a tripler
  57. When an AM signal leaves the antenna of a transmitter, which of the following frequency components does the signal contain?
    The carrier, upper sideband, and lower sideband.
  58. In a single-sideband transmitter, selection of the desired sideband and suppression of the other is done by which of the following components?
    Filter
  59. When compared to a conventional AM signal, an ssb signal provides which of the following advantages?
    Improved frequency stability
  60. For ship-to-shore teletypewriter circuits,which of the following types of multiplexing is/are used?
    Time and/or frequency
  61. Operators of transmitters and receivers use a circuit to coordinate the service of messages and to make frequency changes. What is the name of this circuit?
    Order-wire circuit
  62. A transmitted electromagnetic wave enters an antenna, induces a voltage into it, and passes that voltage to a receiver.What is this chain of events called?
    Reception
  63. When a receiver picks one frequency out from all other frequencies, it's performing which of the following basic functions?
    Selection
  64. When a receiver separates the audio frequencies from the radio-frequency carrier it is performing which of the following basic functions?
    Detection
  65. The receiver action of converting electrical energy to a usable format, such as sound, is an example of which of the following basic functions?
    Reproduction
  66. Which of the following measurements provides an indication of the ability of a receiver to reproduce weak signals?
    Sensitivity
  67. Overall sensitivity of a receiver is limited by which of the following factors?
    Noise
  68. How is a receiver's ability to reject unwanted signals and receive desired signals determined?
    Selectivity
  69. When high fidelity is your prime consideration you should select a receiver that has been designed with which of the following features?
    Broadband frequency selection circuits
  70. The IF frequency in a receiver is produced by which of the following methods?
    Heterodyning
  71. The process of heterodyning takes place in which of the following receiver circuits?
    Mixer
  72. Of the following frequencies, which one is a typical value of IF for AM communications receivers?
    455 kilohertz
  73. Two or more circuits within a receiver are varied by a single control through the use of which of the following processes?
    Ganged tuning
  74. There are electrical differences between AM and fm receivers. An fm receiver contains which of the following circuits?
    Discriminator and Limiter
  75. An fm signal has which of the following characteristics when compared to an AM signal?
    Less static
  76. Ssb transmissions have which of the following characteristics when compared to AM transmissions?
    Concentrated power
  77. Single sideband receivers use a special oscillator. The output of that oscillator is fed directly to the detector circuit. What type of oscillator is used?
    Carrier reinsertion
  78. A transmitter has a suppressed carrier frequency of 4 megahertz and is radiating only an upper sideband signal. When the intelligence is a 1-kilohertz tone, which of the following sideband frequencies will be transmitted?
    4,000 kilohertz
  79. Manual gain lets you adjust a receiver for maximum sensitivity and amplify weak input signals. Which of the following internal sections of the receiver are varied by this control?
    Radio frequency
  80. Manual volume control of a receiver internally varies the input to which of the following circuits?
    Audio amplifier
  81. Changes in receiver input strength due to changing atmospheric conditions is described by which of the following terms?
    Fading
  82. To automatically compensate for input signal strength variations within a receiver, which of the following types of circuits are added?
    Agc
  83. AgC circuitry within a receiver uses a portion of which of the following detector voltage components as a feedback signal to preceding stages?
    Dc
  84. Which of the following types of agc voltage drives an amplifier toward cutoff?
    Reverse
  85. What is the purpose of the squelch circuit in a receiver?
    To suppress receiver noise output when no input signal is being received
  86. How does a receiver accomplish the squelch function?
    By blocking the detector or audio amplifier when there is no signal
  87. A quartz crystal filter is used in a communications receiver to improve which of the following characteristics?
    Selectivity
  88. Automatic frequency control circuits are used in a receiver for which of the following purposes?
    To automatically tune the receiver to the desired frequency
  89. A change in oscillator frequency will change which of the following input relationships between the sawtooth reference voltage and the incoming signal?
    Voltage
  90. How is the long term stability and accuracy required of modern communications receivers attained?
    Through a process known as frequency synthesis
  91. When using the frequency synthesis process, a signal of the desired accuracy and stability is produced by which, if any, of the following methods?
    The heterodyning and selection of frequencies which are not harmonically related to each other
  92. Permanent magnet speakers respond quite well to which of the following audio frequency ranges?
    Low
  93. For which of the following reasons do most standard Navy headphones respond poorly to low frequencies?
    Small diaphragm size and diaphragm inflexibility

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