1N051 Unit 4

35 Questions | Total Attempts: 135

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1N051 Unit 4

Unit 4 Review


Questions and Answers
  • 1. 
    __ is simply an emission of EM radiation in the form of anything from a radio wave to gamma rays
    • A. 

      The electromagnetic spectrum

    • B. 

      A waveform

    • C. 

      Radiation

    • D. 

      A signal

  • 2. 
    __ EM energy behaves in __ manner
    • A. 

      Most/similar

    • B. 

      Most/same

    • C. 

      All/similar

    • D. 

      All/same

  • 3. 
    __ is the title given to all types of radiation when referred to as a whole
    • A. 

      The EM spectrum

    • B. 

      The radiation continuum

    • C. 

      The visible spectrum

    • D. 

      Radio frequency

  • 4. 
    __ is energy that spreads out as it travels away from its source
    • A. 

      Electromagnetic energy

    • B. 

      The visible spectrum

    • C. 

      Cosmic rays

    • D. 

      Radiation

  • 5. 
    The EM spectrum is divided into regions also known as __
    • A. 

      Wavelengths

    • B. 

      Frequencies

    • C. 

      Spectrums

    • D. 

      Bands

  • 6. 
     __ fall within the visible region of the EM spectrum
    • A. 

      Cosmic rays, gamma rays, x-rays, ultraviolet (UV)

    • B. 

      Ultra high frequency, ultraviolet, and infrared

    • C. 

      Infrared, ultraviolet, and very low frequency

    • D. 

      Cosmic ray, gamma ray, and infrared

  • 7. 
    __ is not part of the RF spectrum
    • A. 

      Very low frequency

    • B. 

      High frequency

    • C. 

      Low frequency

    • D. 

      Gamma ray

  • 8. 
    Which region  of the electromagnetic spectrum falls between the frequencies of 1 Mhz and 300 Mhz
    • A. 

      Extremely low frequency

    • B. 

      Super high frequency

    • C. 

      Very high frequency

    • D. 

      Ultra high frequency

  • 9. 
    Which region of the electromagnetic spectrum falls between the frequencies of 300 Mhz-3000 Mhz
    • A. 

      Extremely low frequency

    • B. 

      Super high frequency

    • C. 

      Very high frequency

    • D. 

      Ultra high frequency

  • 10. 
    Which region of the electromagnetic spectrum falls between the frequencies of 3000 Mhz-6000 Mhz
    • A. 

      Extremely low frequency

    • B. 

      Super high frequency

    • C. 

      Very high frequency

    • D. 

      Ultra high frequency

  • 11. 
    Which type of radiant energy travels in all directions from its source and is similar to waves emanating from a pebble dropped in a pond
    • A. 

      Infrared

    • B. 

      Radiation

    • C. 

      Radio

    • D. 

      Light

  • 12. 
    __ is the distance a wave travels during one complete rotation and determines the energy's form and is used to graphically display it as bands on the EM spectrum
    • A. 

      Wavelength

    • B. 

      Frequency

    • C. 

      Spectrum

    • D. 

      Exclusion

  • 13. 
    __ allows scientists to design and build sensors that detect EM energy from one region of the spectrum while excluding others
    • A. 

      Wavelength

    • B. 

      Frequency

    • C. 

      Spectrum

    • D. 

      Exclusion

  • 14. 
    __ is actually a continuum of energy, ranging from very short wavelengths (gamma rays) to very long wavelengths (radio waves)
    • A. 

      The electromagnetic spectrum

    • B. 

      The electromagnetic timeline

    • C. 

      The electromagnetic theory

    • D. 

      Radar theory

  • 15. 
    RADAR is an acronym for __
    • A. 

      Radio detection and reflection

    • B. 

      Radio deflection and reflection

    • C. 

      Radio detection and ranging

    • D. 

      Radar detection and ranging

  • 16. 
    Radar is an __ system because it transmits bursts of microwave energy
    • A. 

      Synthetic aperature

    • B. 

      Semi-active

    • C. 

      Passive

    • D. 

      Active

  • 17. 
    What are the radar signal characteristics determined by the radar transmitter?
    • A. 

      Pulse width, pulse recurrence integer, pulse repetition frequency, and wavelength

    • B. 

      Pulse width, pulse recurrence time, pulse repetition frequency, and frequency

    • C. 

      Pulse duration, pulse recurrence time, pulse repetition frequency, and power

    • D. 

      Pulse width, pulse recurrence time, pulse repetition frequency, and power

  • 18. 
    __ radar transmitter produces a RF signal with __ characteristics that differentiate it from all other signals
    • A. 

      Every/specific

    • B. 

      Some/specific

    • C. 

      Every/identical

    • D. 

      Some/identical

  • 19. 
    The concept of __ based on the line of sight (LOS) principle where the object must be visible to radar
    • A. 

      Radar energy is reflected by natural and cultural features

    • B. 

      Angle of reflection equals the angle of incidence

    • C. 

      Radar energy travels at a constant velocity

    • D. 

      Radar energy travels in a straight line

  • 20. 
    When the radar's LOS is obstructed, it creates what is known as a __, which is displayed on radarscope.
    • A. 

      Radar shadow

    • B. 

      Radar blip

    • C. 

      Target

    • D. 

      Bogie

  • 21. 
    Urban reversal or frontal effect is created when structures __ to the radar source shield more __ structures and is significant when at low altitudes and flying over or near major cities
    • A. 

      Perpendicular/parallel

    • B. 

      Similar/operational

    • C. 

      Closest/distant

    • D. 

      Next/critical

  • 22. 
    __ occurs when a physical object, like a mountain, is positioned between the radar and the target
    • A. 

      Radar shadow

    • B. 

      Radar masking

    • C. 

      Terrain masking

    • D. 

      Geographical masking

  • 23. 
    The measurement unit for radar speed is a __
    • A. 

      Millisecond

    • B. 

      Microsecond

    • C. 

      Millimeter

    • D. 

      Centimeter

  • 24. 
    The __ is a constant equation built into the radar that allows us to determine the range of an object
    • A. 

      Radar wavelength

    • B. 

      Radar factor

    • C. 

      Radar mile

    • D. 

      Radar beam

  • 25. 
    The reflected signal strength is directly __ to the reflecting object's density
    • A. 

      Proportional

    • B. 

      Relational

    • C. 

      Inverse

    • D. 

      Convex

  • 26. 
    Very hard materials __, while softer materials like wood and earth reflect less and absorb more
    • A. 

      Reflect more and absorb more/reflect less absorb less

    • B. 

      Reflect less and absorb more/reflect more and absorb less

    • C. 

      Reflect more and absorb less/reflect less and absorb more

    • D. 

      Reflect less and absorb less/reflect more and absorb more

  • 27. 
    When radar energy strikes an object at an angle that reflects away from the radar set, but reflects toward the radar set by yet another object it is called __
    • A. 

      False positives

    • B. 

      Duplicate reflection

    • C. 

      Multiple reflections

    • D. 

      RADAR deflection

  • 28. 
    Typically, very long range/earely warning radars operate at __ frequencies (longer wavelengths) to increase detection range, while most target tracking radars operate at __ frequencies (smaller wavelengths) to increase target accuracy
    • A. 

      Lower/higher

    • B. 

      Higher/lower

    • C. 

      Longer/shorter

    • D. 

      Variable/fixed

  • 29. 
    __ is the number of times per second the RF energy compeltes one cycle and is measured as a hertz (Hz)
    • A. 

      Pulse repetition frequency

    • B. 

      Single frequency

    • C. 

      Pulse repetition time

    • D. 

      Pulse repetition interval

  • 30. 
    __ is the rate at which pulses or  pulse groups are transmitted expressed in Hz
    • A. 

      Pulse repetition frequency

    • B. 

      Single frequency

    • C. 

      Pulse repetition time

    • D. 

      Pulse repetition interval

  • 31. 
    __ is the time required for a complete transmission cycle, from the beginning of one pulse of RF energy to the beginning of the next measured in microseconds
    • A. 

      Pulse repetition frequency

    • B. 

      Single frequency

    • C. 

      Pulse repetition time

    • D. 

      Pulse repetition interval

  • 32. 
    __ is used in RWRs and other electronic warfare support (ES) assets to discriminate between radar systems
    • A. 

      Pulse repetition frequency

    • B. 

      Single frequency

    • C. 

      Pulse repetition time

    • D. 

      Pulse repetition interval

  • 33. 
    __ is the power of the signal and can be expressed in peak and average
    • A. 

      Amplitude

    • B. 

      Average power

    • C. 

      Wavelength

    • D. 

      Peak power

  • 34. 
    __ provides a better measure of a radar's detection range than does peak power
    • A. 

      Amplitude

    • B. 

      Average power

    • C. 

      Wavelength

    • D. 

      Peak power

  • 35. 
    __ is the amplitude of an individual radar pulse, measured in watts or megawatts, and radiated when the transmitter is active
    • A. 

      Amplitude

    • B. 

      Average power

    • C. 

      Wavelength

    • D. 

      Peak power