Avionics

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Author:
Byronallen
ID:
98470
Filename:
Avionics
Updated:
2011-12-29 13:40:08
Tags:
Ame Avionics aircraft
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Description:
Aircraft maintenance Engineering AME Avionics
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  1. What does TCAS stand for?
    Traffic collision aviodance system
  2. What modulation type uses a changing frequency on the carrier wave?
    Frequency Modulation
  3. What is the drawback of frequency modulation?
    Large bandwidth
  4. HF is what kind kind of waves?
    Sky waves
  5. VHF and UHF are what kind of waves?
    Space waves
  6. What are the 2 types of carrier wave fields?
    electric and magnetic
  7. What generates the carrier wave?
    Oscillator
  8. What adds information to the carrier waves?
    the modulator
  9. What are the 3 types of microphones?
    Carbon Dynamic Electret
  10. Antenna coupler does 2 things?
    Lightning protection and "Tune and peak"
  11. If the system has no "tune and peak" what tunes the antenna?
    The capacitance of the length of Coaxial cable
  12. 4 types of antennas?
    • Monopole
    • Hertz Dipole
    • Straight wire
    • Loopwire
  13. What frequency type does a straight wire antenna sense?
    Low frequency
  14. What does the monopole antenna use for a ground?
    the skin of the aircraft
  15. What direction is a dipole antenna mounted?
    Horizontally
  16. What system uses crystals to tune in a radio frequency?
    Superheterodyne
  17. What determines the distance antennas are mounted?
    the length of the antennas
  18. What sets the sensitivity of VHF?
    Squelch knob
  19. What kind of antenna does a VHF use?
    Monopole
  20. where are VHF antennas mounted?
    Bottom of aircraft
  21. What does SELCAL do?
    allows you to talk to one aircraft individually on company frequency without disrupting any others
  22. What system can update the FMS system enroute, by text , and performs trend monitoring?
    ACARS
  23. ADF uses 2 antennas what are they?
    Loop and straight wire
  24. what kind of antenna does a VOR use?
    Dipole on vert stab
  25. OBS stands for?
    Omni Bearing selector
  26. CDI stands for?
    course deviation indicator
  27. what is the ADV slaved to?
    Flux valve
  28. What affects HF waves
    Atmospheric disturbances (weather)
  29. What 2 kinds of radio waves exist in a radio transmitting antenna to cause it to radiate electrical energy?
    • electrical
    • magnetic
  30. The higher the frequency, the (longer or shorter) the wavelength.
    shorter
  31. The frequency of a radio transmission indicates the number of electromagnetic field ______ that occur in ____ second.
    • oscillations
    • one
  32. radio waves travel at the speed of ______
    light
  33. A______ wave is necessary to transmit radio waves and antennas are usually ______ to _____ the length of the transmitted wave.
    carrier , one quarter , one half
  34. Each oscillation is called a ____ and frequency is measured in ____ per second or _____.
    • cycle
    • cycles
    • hertz
  35. There are 2 ways to modulate a carrier wave?
    • amplitude modulation
    • frequency modulation
  36. The 3 basic functions of a radio transmitter are:
    • generate signal at the correct frequency
    • modulate the signal
    • amplify the signal
  37. What type of radio waves bounce off the ionosphere and can be used to achieve _____-_____ radio transmission.
    sky, long range
  38. The component that generates the carrier wave is called?
    oscillator
  39. A component found in both transmitters and receivers that increases signal strength?
    amplifier
  40. A half wave antenna may also be referred to as a?
    Hertz dipole antenna
  41. The metal surrounding the base of a marconi monopole antenna is called?
    ground plane
  42. Aircraft VHF communications antennas are polarized in what direction?
    vertically
  43. What circuit is used to isolate the desired frequency from all other frequencies picked up by an antenna?
    tuning circuit
  44. HF radios are most commonly used by large aircraft for (general, oceanic, or continental ) ATC communication
    oceanic
  45. Most civilian aviation radio communication is done in the (uhf or vhf) range
    VHF
  46. VHF comms are limited to line of sight. true or false
    true
  47. A special VHF/HF communication system for calling a single specific aircraft is known as ?
    SELCAL
  48. SATCOM radios operate in the (VHF or UHF) range and can carry both _____ and _____ communication.
    UHF , Voice and Data
  49. ACARS is a system for transmitting routine operational, maintenance and administrative messages to airliners via?
    digital data link
  50. The 2 antennas required for an ADF are?
    • sense
    • loop
  51. ADF is (air or ground) equipment while NDB are (air or ground) equipment
    • ADF air
    • NDB ground
  52. What does ADF stand for?
    automatic direction finder
  53. what does NDB stand for?
    Non directional beacon
  54. ADF operates in the (LF/MF or VHF/UHF) range
    LF/MF
  55. VOR is a (phase or voltage) comparison system
    phase
  56. VOR nav radios used for IFR ops must be checked for accuracy every how many days?
    30
  57. DME is or is not a form of pulse equipment?
    is
  58. An RNAV must be tuned to a VOR or VORTAC system to operate normally
    VORTAC
  59. GPS is a ground or space based system
    space
  60. Inertial nav systems do or do not require an external radio signal?
    do not
  61. INS systems operate by accurately measuring ?
    acceleration

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