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Ship Radar Endorsement
Element 8
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Ship Radar Endorsement · 300 questions

Element 8 - USCG Exam Questions

Ship radar techniques: radar principles, transmitters and receivers, antennas, displays, installation, servicing and safety. The exam asks 50 questions; 38 correct passes.

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 8 questions

Questions 1–100 of 300 · page 1 of 3

  1. #1 Choose the most correct statement containing the parameters which control the size of the target echo.
  2. #2 Which of the following has NO effect on the maximum range capability?
  3. #3 What type of transmitter power is measured over a period of time?
  4. #4 What RADAR component controls timing throughout the system?
  5. #5 Which of the following components allows the use of a single antenna for both transmitting and receiving?
  6. #6 The sweep frequency of a RADAR indicator is determined by what parameter?
  7. #7 A radio wave will travel a distance of three nautical miles in:
  8. #8 One RADAR mile is how many microseconds?
  9. #9 RADAR range is measured by the constant:
  10. #10 If a target is 5 miles away, how long does it take for the RADAR echo to be received back at the antenna?
  11. #11 How long would it take for a RADAR pulse to travel to a target 10 nautical miles away and return to the RADAR receiver?
  12. #12 What is the distance in nautical miles to a target if it takes 308.5 microseconds for the RADAR pulse to travel from the RADAR antenna to the target a...
  13. #13 Frequencies generally used for marine RADAR are in the ___ part of the radio spectrum.
  14. #14 Practical RADAR operation requires the use of microwave frequencies so that:
  15. #15 An S-band RADAR operates in which frequency band?
  16. #16 A RADAR operating at a frequency of 3 GHz has a wavelength of approximately:
  17. #17 The major advantage of an S-band RADAR over an X-band RADAR is:
  18. #18 An X band RADAR operates in which frequency band?
  19. #19 A pulse RADAR has a pulse repetition frequency (PRF) of 400 Hz, a pulse width of 1 microsecond, and a peak power of 100 kilowatts. The average power o...
  20. #20 A shipboard RADAR transmitter has a pulse repetition frequency (PRF) of 1,000 Hz, a pulse width of 0.5 microseconds, peak power of 150 KW, and a minim...
  21. #21 A pulse RADAR transmits a 0.5 microsecond RF pulse with a peak power of 100 kilowatts every 1600 microseconds. This RADAR has:
  22. #22 If a RADAR transmitter has a pulse repetition frequency (PRF) of 900 Hz, a pulse width of 0.5 microseconds and a peak power of 15 kilowatts, what is i...
  23. #23 What is the average power if the RADAR set has a PRF of 1000 Hz, a pulse width of 1 microsecond, and a peak power rating of 100 kilowatts?
  24. #24 A search RADAR has a pulse width of 1.0 microsecond, a pulse repetition frequency (PRF) of 900 Hz, and an average power of 18 watts. The unit’s peak p...
  25. #25 For a range of 5 nautical miles, the RADAR pulse repetition frequency should be:
  26. #26 For a range of 100 nautical miles, the RADAR pulse repetition frequency should be:
  27. #27 The minimum range of a RADAR is determined by:
  28. #28 Short range RADARs would most likely transmit:
  29. #29 For a range of 30 nautical miles, the RADAR pulse repetition frequency should be:
  30. #30 For a range of 10 nautical miles, the RADAR pulse repetition frequency (PRF) should be:
  31. #31 If the PRF is 2500 Hz, what is the PRI?
  32. #32 If the pulse repetition frequency (PRF) is 2000 Hz, what is the pulse repetition interval (PRI)?
  33. #33 The pulse repetition rate (PRR) refers to:
  34. #34 If the RADAR unit has a pulse repetition frequency (PRF) of 2000 Hz and a pulse width of 0.05 microseconds, what is the duty cycle?
  35. #35 Small targets are best detected by:
  36. #36 What is the relationship between pulse repetition rate and pulse width?
  37. #37 What component of a RADAR receiver is represented by block 46 in Fig. 8A1?
  38. #38 A basic sample-and-hold circuit contains:
  39. #39 When comparing a TTL and a CMOS NAND gate:
  40. #40 Silicon crystals:
  41. #41 Which is typical current for a silicon crystal used in a RADAR mixer or detector circuit?
  42. #42 What component of a RADAR receiver is represented by block 47 in Fig. 8A1?
  43. #43 The basic frequency determining element in a Gunn oscillator is:
  44. #44 Which of the following is not a method of analog-to-digital conversion?
  45. #45 When comparing TTL and CMOS logic families, which of the following is true:
  46. #46 The primary operating frequency of a reflex klystron is controlled by the:
  47. #47 A Gunn diode oscillator takes advantage of what effect?
  48. #48 Fine adjustments of a reflex klystron are accomplished by:
  49. #49 Blocking oscillators operate on the formula of:
  50. #50 The block diagram of a typical RADAR system microprocessor is shown in Fig. 8A2. Choose the most correct statement regarding this system.
  51. #51 The phantastron circuit is capable of:
  52. #52 The block diagram of a typical RADAR system microprocessor is shown in Fig. 8A2. Choose the most correct statement regarding this system.
  53. #53 In the Line-Driver/Coax/Line-receiver circuit shown in Fig. 8A3, what component is represented by the blank box marked "X"?
  54. #54 Choose the most correct statement:
  55. #55 In the circuit shown in Fig. 8A4, U5 pins 1 and 4 are high and both are in the reset state. Assume one clock cycle occurs of Clk A followed by one cyc...
  56. #56 If more light strikes the photodiode in Fig. 8A5, there will be:
  57. #57 In the circuit shown in Fig. 8A6, which of the following is true?
  58. #58 What is the correct value of RS in Fig. 8A7, if the voltage across the LED is 1.9 Volts with 5 Volts applied and If max equals 40 milliamps?
  59. #59 The block diagram of a typical RADAR system microprocessor is shown in Fig. 8A2. Choose the most correct statement regarding this system.
  60. #60 You are troubleshooting a component on a printed circuit board in a RADAR system while referencing the Truth Table in Fig. 8A8. What kind of integrate...
  61. #61 The magnetron is used to:
  62. #62 The purpose of the modulator is to:
  63. #63 Which of the following statements about most modern RADAR transmitter power supplies is false?
  64. #64 The purpose of the Pulse Forming Network is to:
  65. #65 The purpose of the Synchronizer is to:
  66. #66 Which of the following is not part of the transmitting system?
  67. #67 High voltage is applied to what element of the magnetron?
  68. #68 The characteristic of the magnetron output pulse that relates to accurate range measurement is its:
  69. #69 What device is used as a transmitter in a marine RADAR system?
  70. #70 The magnetron is:
  71. #71 A negative voltage is commonly applied to the magnetron cathode rather than a positive voltage to the magnetron anode because:
  72. #72 The anode of a magnetron is normally maintained at ground potential:
  73. #73 In a solid-state RADAR modulator, the duration of the transmitted pulse is determined by:
  74. #74 The modulation frequency of most RADAR systems is between:
  75. #75 A shipboard RADAR uses a PFN driving a magnetron cathode through a step-up transformer. This results in which type of modulation?
  76. #76 In a pulse modulated magnetron what device determines the shape and width of the pulse?
  77. #77 What device(s) may act as the modulator of a RADAR system?
  78. #78 The purpose of a modulator in the transmitter section of a RADAR is to:
  79. #79 The pulse developed by the modulator may have an amplitude greater than the supply voltage. This is possible by:
  80. #80 Pulse transformers and pulse-forming networks are commonly used to shape the microwave energy burst RADAR transmitter. The switching devices most ofte...
  81. #81 The purpose of the pulse-forming network is to:
  82. #82 The shape and duration of the high-voltage pulse delivered to the magnetron is established by:
  83. #83 Pulse-forming networks are usually composed of the following:
  84. #84 An artificial transmission line is used for:
  85. #85 The ferrite material in a circulator is used as a(an):
  86. #86 In a circular resonant cavity with flat ends, the E-field and the H-field form with specific relationships. The:
  87. #87 A ferrite circulator is most commonly used in what portion of a RADAR system?
  88. #88 A circulator provides what function in the RF section of a RADAR system?
  89. #89 A directional coupler has an attenuation of -30 db. A measurement of 100 milliwatts at the coupler indicates the power of the line is:
  90. #90 What is the purpose or function of the RADAR duplexer/circulator?
  91. #91 The ATR box:
  92. #92 When a pulse RADAR is radiating, which elements in the TR box are energized?
  93. #93 The TR box:
  94. #94 What device is located between the magnetron and the mixer and prevents received signals from entering the magnetron?
  95. #95 A keep-alive voltage is applied to:
  96. #96 A DC keep-alive potential:
  97. #97 What RADAR circuit determines the pulse repetition rate (PRR)?
  98. #98 The triggering section is also known as the:
  99. #99 Operation of any RADAR system begins in the:
  100. #100 The timer circuit:

Element 8 questions: what to expect

Q How many Element 8 questions are in the Ship Radar Endorsement pool?

There are 300 Element 8 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 8 module from the same pool.

Q What score do I need to pass the Element 8 module?

Most USCG exam modules, including Element 8, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG Element 8 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 Ship Radar Endorsement question pool

The FCC Element 8 pool for the Ship Radar Endorsement: radar theory, installation, servicing and maintenance of ship radar equipment used for navigation.