3d1x5 Volume 1 (Ure)

89 Questions | Total Attempts: 263

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CDCs Quizzes & Trivia

Volume 1 for 3D1X5 CDCs


Questions and Answers
  • 1. 
    What is the required angle of incidence necessary to get a reflection back to a light source?
    • A. 

      45

    • B. 

      90

    • C. 

      135

    • D. 

      180

  • 2. 
    When a pulse of radio frequency energy is transmitted, it travels at
    • A. 

      The speed of light

    • B. 

      The speed of sound

    • C. 

      One-half the speed of light

    • D. 

      One-half the speed of sound

  • 3. 
    Approximately how long does it take for radio frequency energy to travel 1 nautical mile to a target and return to the radar?
    • A. 

      3.09 us

    • B. 

      6.18 us

    • C. 

      9.27 us

    • D. 

      12.36 us

  • 4. 
    You can identify the maximum detection range of a radar by dividing the time of one radar mile into the
    • A. 

      Transmitter on-time

    • B. 

      Transmitter off-time

    • C. 

      Pulse recurrence time

    • D. 

      Pulse repetition frequency

  • 5. 
    What characteristic of frequency does a radar target moving towards the radar exhibit?
    • A. 

      A lower frequency than the original broadcast

    • B. 

      A higher frequency than the original broadcast

    • C. 

      No apparent frequency change than the original broadcast

    • D. 

      Oscillating lower and higher frequency changes in respect to the original broadcast

  • 6. 
    Which radar subassembly ensures all circuits connected with the radar operate in a definite timed relationship?
    • A. 

      Synchronizer

    • B. 

      Transmitter

    • C. 

      Modulator

    • D. 

      Duplexer

  • 7. 
    What radar subassembly allows the radar system to transmit and receive from the same antenna?
    • A. 

      Synchronizer

    • B. 

      Transmitter

    • C. 

      Modulator

    • D. 

      Duplexer

  • 8. 
    An antenna is said to be reciprocal if
    • A. 

      It is nonlinear

    • B. 

      It transmits patterns

    • C. 

      It contains ferrite devices

    • D. 

      Its transmit and receive patterns are identical

  • 9. 
    Which feedhorn is used only for receiving?
    • A. 

      Active

    • B. 

      Linear

    • C. 

      Passive

    • D. 

      Circular

  • 10. 
    One use for the beam-lobing switch of the multi-feedhorn system is to
    • A. 

      Raise the effective beam coverage by 3

    • B. 

      Dummy load the lower 3 of the transmitted beam

    • C. 

      Route the received signal from the number one feedhorn to a dummy load

    • D. 

      Vary low-level coverage by routing more radio frequency through one feedhorn

  • 11. 
    What does the distribution of electromagnetic energy from the antenna over the aperture determine?
    • A. 

      Main lobe gain

    • B. 

      Pattern of the antenna

    • C. 

      Probability of interference

    • D. 

      Susceptibility of the antenna

  • 12. 
    The shape of the beam of radar energy and its antenna pattern depend on the radar’s
    • A. 

      Gain

    • B. 

      Location

    • C. 

      Purpose

    • D. 

      Power

  • 13. 
    The scanning method used by the radar system refers to the
    • A. 

      Direction of energy into an appropriately shaped beam

    • B. 

      Orientation of the electromagnetic wave as it travels through space

    • C. 

      Motion of the antenna axis (of the beam) as the radar looks for an aircraft

    • D. 

      Efficient launch and reception of electromagnetic energy in the atmosphere or space

  • 14. 
    What scan is identified at the electronic countermeasure receiver by its regular intervals between illuminations?
    • A. 

      Raster

    • B. 

      Conical

    • C. 

      Circular

    • D. 

      Monopulse

  • 15. 
    What scan system uses a thin beam to cover a rectangular area by sweeping the area horizontally with the angle of elevation incrementally stepped up or down with each horizontal sweep of the sector?
    • A. 

      Raster

    • B. 

      Conical

    • C. 

      Circular

    • D. 

      Monopulse

  • 16. 
    Which scan radar is also used in the acquisition phase by some airborne intercept radars?
    • A. 

      Raster

    • B. 

      Conical

    • C. 

      Circular

    • D. 

      Monopulse

  • 17. 
    Which scan radar gets its name from the fact that each echo pulse from the aircraft being tracked yields a new azimuth and elevation correction signal?
    • A. 

      Raster

    • B. 

      Conical

    • C. 

      Circular

    • D. 

      Monopulse

  • 18. 
    In which scan radar does the antenna rotate on an azimuth sweep, while the elevation angle rises slowly from 0 to 90?
    • A. 

      Palmer

    • B. 

      Helical

    • C. 

      Palmer/Raster

    • D. 

      Track-While

  • 19. 
    What causes delayed, but separate, pulses?
    • A. 

      Simultaneous reception of pulse-type information

    • B. 

      Near-simultaneous reception of pulse-type information

    • C. 

      Electromagnetic (EM) waves reach the receiving antenna by direct paths

    • D. 

      EM waves reach the receiving antenna by indirect paths

  • 20. 
    Attempts to reduce multipath effects on radar tracking accuracy include the use of
    • A. 

      Off-axis tracking

    • B. 

      Frequency agility

    • C. 

      Monopulse radar

    • D. 

      Off-boresight tracking

  • 21. 
    What type of radar system uses a B-scan indicator?
    • A. 

      Long-range surveillance

    • B. 

      Airport surveillance

    • C. 

      Precision approach

    • D. 

      Weather

  • 22. 
    What target information is provided by a plan-position indicator?
    • A. 

      Azimuth only

    • B. 

      Elevation only

    • C. 

      Range and azimuth

    • D. 

      Elevation and range

  • 23. 
    In a Raster scan indicator, how many vertical scan periods does it take to produce one complete picture?
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 24. 
    Which indicator component produces signals that determine the overall operation of what the indicator will do?
    • A. 

      Data processing circuits

    • B. 

      Deflection circuits

    • C. 

      Cathode-ray tube

    • D. 

      Video circuits

  • 25. 
    In a typical indicator system, where is digital display data from the data processing circuits converted into analog drive signals?
    • A. 

      Deflection circuits

    • B. 

      Cathode-ray tube

    • C. 

      Video circuits

    • D. 

      Power supply

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