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GMDSS · 605 questions

Element 3 - USCG Exam Questions

General radiotelephone operator knowledge: radio law and regulations, operating procedures, and radio equipment fundamentals.

Every question below is a real U.S. Coast Guard exam question with four choices. Answer one and the correct choice is revealed instantly, with the USCG reference and illustration where the question uses one.

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All Element 3 questions

Questions 201–300 of 605 · page 3 of 7

  1. #201 TTL inputs left open develop what logic state?
  2. #202 Which of the following instruments would be best for checking a TTL logic circuit?
  3. #203 What do the initials TTL stand for?
  4. #204 What is a characteristic of an AND gate?
  5. #205 What is a characteristic of a NAND gate?
  6. #206 What is a characteristic of an OR gate?
  7. #207 What is a characteristic of a NOR gate?
  8. #208 What is a characteristic of a NOT gate?
  9. #209 Which of the following logic gates will provide an active high out when both inputs are active high?
  10. #210 In a negative-logic circuit, what level is used to represent a logic 0?
  11. #211 For the logic input levels shown in Figure 3E12, what are the logic levels of test points A, B and C in this circuit? (Assume positive logic.) illustration
  12. #212 For the logic input levels given in Figure 3E13, what are the logic levels of test points A, B and C in this circuit? (Assume positive logic.) illustration
  13. #213 In a positive-logic circuit, what level is used to represent a logic 1?
  14. #214 Given the input levels shown in Figure 3E14 and assuming positive logic devices, what would the output be? illustration
  15. #215 What is a truth table?
  16. #216 A flip-flop circuit is a binary logic element with how many stable states?
  17. #217 What is a flip-flop circuit? A binary sequential logic element with ___stable states.
  18. #218 How many flip-flops are required to divide a signal frequency by 4?
  19. #219 How many bits of information can be stored in a single flip-flop circuit?
  20. #220 How many R-S flip-flops would be required to construct an 8 bit storage register?
  21. #221 An R-S flip-flop is capable of doing all of the following except:
  22. #222 The frequency of an AC signal can be divided electronically by what type of digital circuit?
  23. #223 What is an astable multivibrator?
  24. #224 What is a monostable multivibrator?
  25. #225 What is a bistable multivibrator circuit commonly named?
  26. #226 What is a bistable multivibrator circuit?
  27. #227 What wave form would appear on the voltage outputs at the collectors of an astable, multivibrator, common-emitter stage?
  28. #228 What is the name of the semiconductor memory IC whose digital data can be written or read, and whose memory word address can be accessed randomly?
  29. #229 What is the name of the semiconductor IC that has a fixed pattern of digital data stored in its memory matrix?
  30. #230 What does the term IO" mean within a microprocessor system?"
  31. #231 What is the name for a microprocessor's sequence of commands and instructions?
  32. #232 How many individual memory cells would be contained in a memory IC that has 4 data bus input/output pins and 4 address pins for connection to the addr...
  33. #233 What is the name of the random-accessed semiconductor memory IC that must be refreshed periodically to maintain reliable data storage in its memory ma...
  34. #234 In a microprocessor-controlled two-way radio, a watchdog" timer:"
  35. #235 What does the term DAC" refer to in a microprocessor circuit?"
  36. #236 Which of the following is not part of a MCU processor?
  37. #237 What portion of a microprocessor circuit is the pulse generator?
  38. #238 In a microprocessor, what is the meaning of the term ALU"?"
  39. #239 What circuit interconnects the microprocessor with the memory and input/output system?
  40. #240 What is the purpose of a prescaler circuit?
  41. #241 What does the term BCD" mean?"
  42. #242 What is the function of a decade counter digital IC?
  43. #243 What integrated circuit device converts an analog signal to a digital signal?
  44. #244 What integrated circuit device converts digital signals to analog signals?
  45. #245 In binary numbers, how would you note the quantity TWO?
  46. #246 What is the limiting condition for sensitivity in a communications receiver?
  47. #247 What is the definition of the term receiver desensitizing"?"
  48. #248 What is the term used to refer to a reduction in receiver sensitivity caused by unwanted high-level adjacent channel signals?
  49. #249 What is meant by the term noise figure of a communications receiver?
  50. #250 Which stage of a receiver primarily establishes its noise figure?
  51. #251 What is the term for the ratio between the largest tolerable receiver input signal and the minimum discernible signal?
  52. #252 How can selectivity be achieved in the front-end circuitry of a communications receiver?
  53. #253 What is the primary purpose of an RF amplifier in a receiver?
  54. #254 How much gain should be used in the RF amplifier stage of a receiver?
  55. #255 Too much gain in a VHF receiver front end could result in this:
  56. #256 What is the advantage of a GaAsFET preamplifier in a modern VHF radio receiver?
  57. #257 In what stage of a VHF receiver would a low noise amplifier be most advantageous?
  58. #258 Why is the Colpitts oscillator circuit commonly used in a VFO (variable frequency oscillator)?
  59. #259 What is the oscillator stage called in a frequency synthesizer?
  60. #260 What are three major oscillator circuits found in radio equipment?
  61. #261 Which type of oscillator circuit is commonly used in a VFO (variable frequency oscillator)?
  62. #262 What condition must exist for a circuit to oscillate? It must:
  63. #263 In Figure 3F15, which block diagram symbol (labeled 1 through 4) is used to represent a local oscillator? illustration
  64. #264 What is the image frequency if the normal channel is 151.000 MHz, the IF is operating at 11.000 MHz, and the LO is at 140.000 MHz?
  65. #265 What is the mixing process in a radio receiver?
  66. #266 In what radio stage is the image frequency normally rejected?
  67. #267 What are the principal frequencies that appear at the output of a mixer circuit?
  68. #268 If a receiver mixes a 13.8 MHz VFO with a 14.255 MHz receive signal to produce a 455 kHz intermediate frequency signal, what type of interference will...
  69. #269 What might occur in a receiver if excessive amounts of signal energy overdrive the mixer circuit?
  70. #270 What degree of selectivity is desirable in the IF circuitry of a wideband FM phone receiver?
  71. #271 Which one of these filters can be used in micro-miniature electronic circuits?
  72. #272 A receiver selectivity of 2.4 kHz in the IF circuitry is optimum for what type of signals?
  73. #273 A receiver selectivity of 10 KHz in the IF circuitry is optimum for what type of signals?
  74. #274 What is an undesirable effect of using too wide a filter bandwidth in the IF section of a receiver?
  75. #275 How should the filter bandwidth of a receiver IF section compare with the bandwidth of a received signal?
  76. #276 What is the primary purpose of the final IF amplifier stage in a receiver?
  77. #277 What factors should be considered when selecting an intermediate frequency?
  78. #278 What is the primary purpose of the first IF amplifier stage in a receiver?
  79. #279 What parameter must be selected when designing an audio filter using an op-amp?
  80. #280 What are the distinguishing features of a Chebyshev filter?
  81. #281 When would it be more desirable to use an m-derived filter over a constant-k filter?
  82. #282 A good crystal band-pass filter for a single-sideband phone would be?
  83. #283 Which statement is true regarding the filter output characteristics shown in Figure 3F16? illustration
  84. #284 What are the three general groupings of filters?
  85. #285 What is an m-derived filter?
  86. #286 What is an advantage of a constant-k filter?
  87. #287 What are the distinguishing features of a Butterworth filter?
  88. #288 What is a product detector?
  89. #289 Which circuit is used to detect FM-phone signals?
  90. #290 What is the process of detection in a radio diode detector circuit?
  91. #291 What is a frequency discriminator in a radio receiver?
  92. #292 In a CTCSS controlled FM receiver, the CTCSS tone is filtered out after the:
  93. #293 What is the definition of detection in a radio receiver?
  94. #294 What is the digital signal processing term for noise subtraction circuitry?
  95. #295 What is the purpose of de-emphasis in the receiver audio stage?
  96. #296 What makes a Digital Coded Squelch work?
  97. #297 What causes a squelch circuit to function?
  98. #298 What makes a CTCSS squelch work?
  99. #299 What radio circuit samples analog signals, records and processes them as numbers, then converts them back to analog signals?
  100. #300 Where would you normally find a low-pass filter in a radio receiver?

Element 3 questions: what to expect

Q How many Element 3 questions are in the GMDSS pool?

There are 605 Element 3 questions on this site, every one released by the U.S. Coast Guard or taken from the National Maritime Center's sample examinations, with its correct answer. The exam draws its Element 3 module from the same pool.

Q What score do I need to pass the Element 3 module?

Most USCG exam modules, including Element 3, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG Element 3 exam questions?

Yes. They are the published U.S. Coast Guard questions, matched to the National Maritime Center's 2026 sample examinations. Answer any question to see the correct choice, the USCG reference and the illustration where the question uses one.

About the GMDSS question pool

These are the published GMDSS Element 3 questions covering general radiotelephone operator knowledge: radio law, operating procedures, and equipment fundamentals.