3d1x5 CDC Pool Of 100

100 Questions | Total Attempts: 47

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CDC Quizzes & Trivia

For use by 3D1X5 personnel for the purpose of CDC EOC testing.


Questions and Answers
  • 1. 
    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

  • 2. 
    What radar subassembly allows the radar system to transmit and receive from the same antenna?
    • A. 

      Synchronizer

    • B. 

      Transmitter

    • C. 

      Modulator

    • D. 

      Duplexer

  • 3. 
    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

  • 4. 
    Which feedhorn is used only for receiving?
    • A. 

      Active

    • B. 

      Linear

    • C. 

      Passive

    • D. 

      Circular

  • 5. 
    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

  • 6. 
    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

  • 7. 
    What scan is identified at the electronic countermeasure receiver by its regular intervals between illuminations?
    • A. 

      Raster

    • B. 

      Conical

    • C. 

      Circular

    • D. 

      Monopulse

  • 8. 
    Which scan radar is also used in the acquisition phase by some airborne intercept radars?
    • A. 

      Raster

    • B. 

      Conical

    • C. 

      Circular

    • D. 

      Monopulse

  • 9. 
    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

  • 10. 
    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

  • 11. 
    What type of radar system uses a B-scan indicator?
    • A. 

      Long-range surveillance

    • B. 

      Airport surveillance

    • C. 

      Precision approach

    • D. 

      Weather

  • 12. 
    What target information is provided by a plan-position indicator?
    • A. 

      Azimuth only

    • B. 

      Elevation only

    • C. 

      Range and azimuth

    • D. 

      Elevation and range

  • 13. 
    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

  • 14. 
    The vacuum in a cathode-ray tube (CRT)
    • A. 

      Prevents implosion if the CRT is broken

    • B. 

      Keeps the phosphor coating from burning

    • C. 

      Eliminates static charges on the deflection plates

    • D. 

      Prevents collisions between electrons in the beam and air molecules

  • 15. 
    An X pulse is present in a selective identification feature code train when
    • A. 

      A Mode 4 reply is being received

    • B. 

      The aircraft is a pilotless drone or missile

    • C. 

      The aircraft is declaring a military emergency

    • D. 

      It is requested by the radar operator to identify the aircraft position

  • 16. 
    Which selective identification feature special response explains a 7500 reply?
    • A. 

      Communication failure

    • B. 

      Military emergency

    • C. 

      Engine failure

    • D. 

      Hijacking

  • 17. 
    What is the AN/UPM–155 radar test set capable of testing?
    • A. 

      Interrogators and associated components

    • B. 

      Radar antenna orientation

    • C. 

      Radar jamming strength

    • D. 

      Radar receivers

  • 18. 
    What factor determines the spacing of the sidebands in an amplitude modulated signal?
    • A. 

      Amplitude of the modulating signal

    • B. 

      Frequency of the modulating signal

    • C. 

      Amplitude of the carrier signal

    • D. 

      Frequency of the carrier signal

  • 19. 
    In frequency modulation, the amount of oscillator frequency change is
    • A. 

      Inversely proportional to the amplitude of the modulating signal

    • B. 

      Directly proportional to the amplitude of the modulating signal

    • C. 

      Inversely proportional to the phase of the modulating signal

    • D. 

      Directly proportional to the phase of the modulating signal

  • 20. 
    In phase modulation, the carrier’s
    • A. 

      Phase shifts at the rate of the modulating signal

    • B. 

      Phase shifts with the phase of the modulating signal

    • C. 

      Amplitude shifts at the rate of the modulating signal

    • D. 

      Amplitude shifts with the phase of the modulating signal

  • 21. 
    What size bit combinations are allowed when using 16–phase shift keying?
    • A. 

      2 bit

    • B. 

      3 bit

    • C. 

      4 bit

    • D. 

      5 bit

  • 22. 
    How is the parity bit used in asynchronous transmission?
    • A. 

      By the receiving device to verify that the transmission was received correctly

    • B. 

      By the transmitting device to verify that the transmission was transmitted correctly

    • C. 

      By the modulator device to verify that the intelligence signal was received correctly

    • D. 

      By the band limiting device to verify that the output signal was transmitted correctly

  • 23. 
    How does synchronous transmission reduce the overhead costs of data transmission?
    • A. 

      Communicates in parallel format

    • B. 

      Blocks many characters together for transmission

    • C. 

      Eliminates the control bits, so more message data can be sent

    • D. 

      Uses low cost equipment to support synchronous transmission

  • 24. 
    When using forward error control as a method of error correction, where does error correction take place?
    • A. 

      Receiving end

    • B. 

      In the oscillator

    • C. 

      Transmitting end

    • D. 

      In the primary buffers

  • 25. 
    Which statement describes an advantage of using fiber optic cable?
    • A. 

      The easy tap-ability of fiber optic cables reduces security risks

    • B. 

      Fiber optic cable has a higher attenuation than coaxial cable

    • C. 

      Electromagnetic fields do not affect fiber optic cables

    • D. 

      Nuclear radiation does not affect fiber optic cable

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