Vol 1. Introduction To Radar Systems, Unit 1. Radar Fundamentals

68 Questions | Total Attempts: 293

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Vol 1. Introduction To Radar Systems, Unit 1. Radar Fundamentals - Quiz

These tests, four (Unit 1 - 4) in total, are designed to give you knowledge about the spectrum of equipment covered by the ground radar career field and to reinforce the information you learned in technical school. These tests are intended to help you progress from an Apprentice (3-level) to a Journeyman level (5-level) in the career field. This series of tests is focused on Volume 1 only.


Questions and Answers
  • 1. 
    What is the purpose of Aircraft control and warning (AC&W) radar?
    • A. 

      To control friendly aircraft, detect hostile aircraft, and control interceptors

    • B. 

      To control enemy aircraft, detect friendly aircraft, and control interceptors

    • C. 

      To control friendly aircraft, detect friendly aircraft, and control interceptors

    • D. 

      To control friendly aircraft, detect hostile interceptors, and control interceptors

  • 2. 
    What is used, with proper receiving equipment, to detect the presence of a distant object?
    • A. 

      Reflected energy

    • B. 

      Light

    • C. 

      Mirror

    • D. 

      Sound waves

  • 3. 
    At what speed do radio waves travel?
    • A. 

      Speed of light

    • B. 

      Speed of sound

    • C. 

      Twice the speed of sound

    • D. 

      Twice the speed of light

  • 4. 
    How long does it take for a radar pulse to travel one radar mile?
    • A. 

      12.36 microseconds

    • B. 

      6.18 microseconds

    • C. 

      24.72 microseconds

    • D. 

      3.09 microseconds

  • 5. 
    What radar assembly supplies timing signals to coordinate the operation of the complete system?
    • A. 

      Synchronizer

    • B. 

      Transmitter

    • C. 

      Duplexer

    • D. 

      Receiver

  • 6. 
    When a transmitter uses a high-power oscillator to produce the output pulse, what switches the oscillator on and off?
    • A. 

      Modulator high-voltage pulse

    • B. 

      Sine-wave oscillator

    • C. 

      Multivibrator

    • D. 

      Blocking oscillator

  • 7. 
    What radar component permits the use of a single antenna for both transmitting and receiving?
    • A. 

      Duplexer

    • B. 

      Receiver

    • C. 

      Transmitter

    • D. 

      Indicator

  • 8. 
    What are the functions of the antenna on transmit?
    • A. 

      Concentrate energy in a predetermined beam shape and to point the beam in a predetermined directions

    • B. 

      Form a beam in a particular direction to gather selectively transmitted energy

    • C. 

      To concentrate energy in a predetermined beam shape and to point this beam in random directions

    • D. 

      To concentrate energy in a random beam shape and to point this beam in a predetermined direction

  • 9. 
    What are the functions of the antenna on receive?
    • A. 

      Forms a beam in a particular direction to gather selectively transmitted energy that has been reflected from various targets Received energy is sent via transmission lines to the receiver

    • B. 

      Concentrate energy in a predetermined beam shape and to point the beam in a predetermined directions

    • C. 

      To concentrate energy in a predetermined beam shape and to point this beam in random directions

    • D. 

      To concentrate energy in a random beam shape and to point this beam in a predetermined direction

  • 10. 
    What does it mean if an antenna is said to be reciprocal?
    • A. 

      The transmit and receive patterns of the antenna are usually identical

    • B. 

      The transmit and receive patterns of the antenna are usually similar

    • C. 

      The transmit and receive patterns of the antenna are usually different

    • D. 

      The transmit and receive patterns of the antenna are always different

  • 11. 
    Which pattern is specified and measured for a reciprocal antenna?
    • A. 

      Transmit

    • B. 

      Transmit and receive

    • C. 

      Transmit or receive

    • D. 

      Receive

  • 12. 
    Why are reflector antennas extremely important and practical devices for use in radar systems?
    • A. 

      Because they offer an economical method of distributing energy over a large aperture area and can produce shaped or pencil beams with high gain.

    • B. 

      Because they offer an expensive method of distributing energy over a large aperture area and can produce shaped or pencil beams with high gain.

    • C. 

      Because they offer an economical method of distributing energy over a small aperture area and can produce shaped or pencil beams with high gain.

    • D. 

      Because they offer an economical method of distributing energy over a large aperture area and can produce shaped or pencil beams with very low gain.

  • 13. 
    What generally does the reflector do with its energy?
    • A. 

      Redirects and reshapes it from one or more point sources located near the focal point into a desired far-field pattern

    • B. 

      Reshapes it from one or more point sources located near the focal point into a desired narrow pattern

    • C. 

      Redirects it from one or more point sources located near the focal point into a desired far-field pattern

    • D. 

      Reshapes it from one or more point sources located near the focal point into a desired far-field pattern

  • 14. 
    What is the most common reflector shape?
    • A. 

      Paraboloid

    • B. 

      Sphere

    • C. 

      Oval

    • D. 

      Flat

  • 15. 
    How is the paraboloid formed?
    • A. 

      By rotating a two-dimensional parabola about its focal axis

    • B. 

      By rotating a two-dimensional parabola about its rear axis

    • C. 

      By rotating a three-dimensional parabola about its focal axis

    • D. 

      By rotating a three-dimensional parabola about its rear axis

  • 16. 
    Why is the paraboloid shape useful?
    • A. 

      Because all rays leaving the focal point and striking the reflector are reflected along a path parallel to the focal axis

    • B. 

      Because all rays leaving the focal point and striking the reflector are reflected along a path perpendicular to the focal axis

    • C. 

      Because half the rays leaving the focal point and striking the reflector are reflected along a path parallel to the focal axis

    • D. 

      Because half the rays leaving the focal point and striking the reflector are reflected along a path perpendicular to the focal axis

  • 17. 
    How is a paraboloid reciprocal?
    • A. 

      Because it intercepts an electromagnetic plane wave traveling parallel to its axis and redirects it so that all of the energy passes to the focal point, where it may be collected

    • B. 

      Because it avoids an electromagnetic plane wave traveling parallel to its axis and redirects it so that all of the energy passes to the focal point, where it may be collected

    • C. 

      Because it intercepts an electromagnetic plane wave traveling perpendicular to its axis and redirects it so that all of the energy passes to the focal point, where it may be collected

    • D. 

      Because it intercepts an electromagnetic plane wave traveling perpendicualr to its axis and reflects it so that all of the energy passes to the focal point, where it may be collected

  • 18. 
    What happens when you change the physical shape of a feedhorn antenna?
    • A. 

      It gives you a fixed change to the radiated beam pattern, but does not give us any way to continuously control or vary the beam pattern

    • B. 

      It gives you a dynamic change to the radiated beam pattern, but does not give us any way to continuously control or vary the beam pattern

    • C. 

      It gives you a fixed change to the radiated beam pattern, but does give us a way to continuously control or vary the beam pattern

    • D. 

      It gives you a dynamic change to the radiated beam pattern, but does give us a way to continuously control or vary the beam pattern

  • 19. 
    How can you provide an amount of control over the received beam pattern?
    • A. 

      Use two feedhorns

    • B. 

      Use one feedhorn

    • C. 

      Change the shape of the feedhorns

    • D. 

      Don't use feedhorns

  • 20. 
    What is the purpose of the active feedhorn?
    • A. 

      It is the normal feedhorn; it is the horn normally used for transmitting and receiving

    • B. 

      It is the normal feedhorn; it is the horn normally used for transmitting

    • C. 

      It is the normal feedhorn; it is the horn normally used for receiving

    • D. 

      It is the passive feedhorn; it is the horn normally receiving

  • 21. 
    What is the purpose of the passive feedhorn?
    • A. 

      It is used only for receiving; it is gated to the receiver only when the signal received by that horn is desired over the signal from the normal horn

    • B. 

      It is used only for transmitting; it is gated to the transmitter only when the signal transmitted by that horn is desired over the signal from the normal horn

    • C. 

      It is used only for transmitting; it is gated to the receiver only when the signal received by that horn is desired over the signal from the normal horn

    • D. 

      It is used only for receiving; it is gated to the transmitter only when the signal transmitted by that horn is desired over the signal from the normal horn

  • 22. 
    What is an advantage of using MTI?
    • A. 

      It reduces clutter

    • B. 

      It increases clutter

    • C. 

      It increases system sensitivity

    • D. 

      It filters out low-level moving clutter

  • 23. 
    What is a disadvantage of using MTI?
    • A. 

      It reduces system sensitivity, and cannot do anything about low-level moving clutter, such as birds

    • B. 

      It increases system sensitivity, and cannot do anything about low-level moving clutter, such as birds

    • C. 

      It reduces system sensitivity, and eliminates low-level moving clutter, such as birds

    • D. 

      It increases system sensitivity, and eliminates low-level moving clutter, such as birds

  • 24. 
    What could you expect if you’re using the clutter-reducing aspect of the dual-feedhorn system on a mountain range reaching 3 degrees above the horizon?
    • A. 

      A significant reduction in the returns from ground targets

    • B. 

      A significant increase in the returns from ground targets

    • C. 

      A significant reduction in the returns from aerial targets

    • D. 

      A significant increase in the returns from aerial targets

  • 25. 
    What problem in the dual-feedhorn antenna can be eliminated by using a 12-feedhorn antenna?
    • A. 

      Multipath reflections

    • B. 

      Single path reflections

    • C. 

      Multipath deflections

    • D. 

      Singlepath deflections

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