CDC 2e151 Satellite, Wideband, And Telemetry Systems Journeyman Volume 1

79 Questions | Total Attempts: 706

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CDC 2E151 Satellite, Wideband, and Telemetry Systems Journeyman Volume 1. This test consists of UREs and Self-Test Questions from volume 1, set 2.


Questions and Answers
  • 1. 
    What are the two types of nuclear environments?
    • A. 

      Primary and derived.

    • B. 

      Source and derived.

    • C. 

      Primary and radiated.

    • D. 

      Source and radiated.

  • 2. 
    What are the four primary nuclear environment elements?
    • A. 

      Thermal radiation, electromagnetic pulse, transient radiation effects on electronics, and air blast and shock.

    • B. 

      Thermal radiation, electromagnetic pulse, transient radiation effects on electronics, and weapon debris.

    • C. 

      Thermally generated x-rays, neutrons, gamma rays, and weapon debris.

    • D. 

      Thermally generated x-rays, neutrons, gamma rays, and airblast and shock.

  • 3. 
    High-altitude electronmagnetic pulse is what type of frequency phenomenon, and involves which frequency range?
    • A. 

      Secondary; 1 Hz to 1GHz

    • B. 

      Wideband; 1 Hz to 1 GHz

    • C. 

      Secondary; 10 Hz to 10 GHz

    • D. 

      Wideband; 10 Hz to 10 GHz

  • 4. 
    High-altitude electromagnetic pulse environment protection is important for critical, time-urgent mission systems because it
    • A. 

      Has a vertical amplitude that decreases inversely with distance, but remains significant for many kilometers.

    • B. 

      Has very intense radial electrical fields, azimuthal magnetic fields, and time-varying air conductivity.

    • C. 

      Is the only nuclear environment that may be imposed on many systems simultaneously with the expenditure of very few weapons.

    • D. 

      Is a problem for electronic components in satellites and reentry vehicles.

  • 5. 
    A system-generated electromagnetic pulse is a problem for satellites and reentry vehicles that are
    • A. 

      Susceptible to the wideband frequency phenomenon.

    • B. 

      Directly exposed to nuclear radiations from a high-altitude burst.

    • C. 

      Affected by the azimuth magnetic fields and time-varying air conductivity.

    • D. 

      Influenced by the signal fading or waveform distortion caused by the structured plasma field.

  • 6. 
    What source region electromagnetic pulse region is produced by the interactions between the weapon products and the earth's atmosphere?
    • A. 

      Secondary

    • B. 

      Source

    • C. 

      Radiated

    • D. 

      Plasma

  • 7. 
    What source region electromagnetic pulse region has a primarily vertical electromagnetic pulse electric field and what structures are affected?
    • A. 

      Radiated: antennas and boresite feedhorns

    • B. 

      Plasma: antennas and boresite feedhorns

    • C. 

      Secondary: cables and ground wires

    • D. 

      Source: cables and ground wires

  • 8. 
    What derived nuclear environment causes communications blackout and seintillation effects?
    • A. 

      Thermal radiation

    • B. 

      Air blast and shock

    • C. 

      Atmospheric disturbances

    • D. 

      Trasient-radiation effects on electronics

  • 9. 
    A communications blackout can be produced by large attenuation of the
    • A. 

      Transmitted signal causing the signal-to-noise ratio to fall below unity.

    • B. 

      Transmitted signal causing the signal-to-noise ratio to rise above unity.

    • C. 

      Recieved signal causing the signal-to-noise ratio to be equal to unity.

    • D. 

      Recieved signal causing the signal-to-noise ratio to rise above unity.

  • 10. 
    Two high-altitude elctromagnetic pulse protection concerns involving today's electronic and communications systemss are protecting against massive system
    • A. 

      Software corruption and permanent component damage.

    • B. 

      Software corruption and permanent system damage.

    • C. 

      Signal distortion and permanent component damage.

    • D. 

      Operation disruption and permanent system damage.

  • 11. 
    What type of exterior system electromagnetic pulse coupling includes imperfectly sealed personnel access doors and equipment hatches, and improper installation of penetrating conductor protection?
    • A. 

      Shield

    • B. 

      Ground system

    • C. 

      Intrastic conductor

    • D. 

      Electronic enclosure

  • 12. 
    What is the reason we cannot draq reliable conclusions about the nature and degree of specific system susceptibility without a detailed test and evaluation?
    • A. 

      All high-altitude electromagnetic pulse vulnerabilities may not be identified

    • B. 

      All system malfunctions may not be corrected

    • C. 

      Overall system system shielding maynot be identified

    • D. 

      Overall environment may not be accessed

  • 13. 
    Broadband transmitter noise can often be eliminated by
    • A. 

      Using a band pass filter.

    • B. 

      Using a band reject filter.

    • C. 

      Increasing output power.

    • D. 

      Decreasing output power.

  • 14. 
    What type of electromagnetic interference occurs when a receiver responds to off-frequency signals?
    • A. 

      Rusty Bolt

    • B. 

      Co-channel

    • C. 

      Brute force

    • D. 

      Spurious responses

  • 15. 
    How can you normally eliminate electromagnetic interference noise bursts caused by sodium and mercury vapor lights that have stopped working while the power is still applied?
    • A. 

      Change the bulb

    • B. 

      Ground out the light fixture

    • C. 

      Install a noise reject filter on the light

    • D. 

      Install a noise reject filter on the receiver

  • 16. 
    At what level does the Air Force want electromagnetic interference problems resolved?
    • A. 

      Affected unit

    • B. 

      Affected major command

    • C. 

      Electromagnetic environmental effects office

    • D. 

      Spectrum interference resolution office

  • 17. 
    What do you do when you are reasonably sure electromagnetic interference exists?
    • A. 

      Request engineering assistance.

    • B. 

      Contact the base frequency manager.

    • C. 

      Systematically gather data for analysis.

    • D. 

      Contact the Spectrum Interference Resolution office.

  • 18. 
    What type transmission line has concentric conductors and minimal radiation losses?  
    • A. 

      Coaxial

    • B. 

      Twin lead.

    • C. 

      Two wire open.

    • D. 

      Parallel two wire.

  • 19. 
    The ratio of voltage to current at the input end of a transmission device is known as the
    • A. 

      Load impedance.

    • B. 

      Input impedance.

    • C. 

      Output impedance.

    • D. 

      Characteristic impedance.

  • 20. 
    What factor is important in determining how well energy transfers from the source to the load through a transmission line?
    • A. 

      Input impedance.

    • B. 

      Load impedance.

    • C. 

      Output impedance.

    • D. 

      Characteristic impedance.

  • 21. 
    What are three ways transmission lines dissipate power?
    • A. 

      Radiation, heating, and reflection.

    • B. 

      Heating, absorption, and refraction.

    • C. 

      Radiation, reflection, and absorption.

    • D. 

      Absorption, refraction, and radiation.

  • 22. 
    Waveguides are capable of handling more power than coaxial lines because the waveguide
    • A. 

      Has less resistance than the coaxial line.

    • B. 

      Has an are-over path twice as long.

    • C. 

      Does not use dielectric support.

    • D. 

      Has an inner silver coating.

  • 23. 
    What determines the size of a waveguide?
    • A. 

      Cutoff frequency.

    • B. 

      Operating frequency.

    • C. 

      Amount of power transmitted.

    • D. 

      Minimum frequency propagated.

  • 24. 
    In fiber optics, which component of the fiber is the optical transmission path?
    • A. 

      Cladding.

    • B. 

      Coating.

    • C. 

      Buffer.

    • D. 

      Core.

  • 25. 
    Which fiber-optic connector uses quick-release, keyed bayonet couplings that are preferred in situations where severe vibrations are not expected?
    • A. 

      Biconic.

    • B. 

      Field (FC).

    • C. 

      Straight tip (ST).

    • D. 

      Sub-miniature, type A (SMA).

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