Aeroplane Systems: Battery Unit and Power Supply
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Questions and Answers

What is the primary function of the battery unit in an aircraft?

  • To maintain a trickle charge supply to the INU
  • To provide a backup power supply during normal operation
  • To regulate the power supply to the INS
  • To provide an uninterruptible power supply during power failures (correct)

    • During normal operation, what is the status of the battery unit?

  • It is in charging mode
  • It is on standby (correct)
  • It is in maintenance mode
  • It is in active mode

    • What is the primary difference between an Inertial Navigation System (INS) and an Inertial Reference System (IRS)?

  • The accuracy of the navigation
  • The method of stabilizing the platform (correct)
  • The type of sensors used
  • The power consumption

    • What is the name given to the IRS system due to the way the accelerometers and ring laser gyros are mounted?

    <p>Strapdown system</p> Signup and view all the answers

    What is the purpose of the electronic modification of the accelerometer outputs in an IRS?

    <p>To compensate for attitude changes</p> Signup and view all the answers

    Why have innovations in laser detecting and computation power led to the introduction of IRS systems?

    <p>To provide an alternative to INS systems</p> Signup and view all the answers

    Why should the accuracy of bearing indications be checked by other means when flying near a thunderstorm?

    <p>Because thunderstorms can cause radio interference</p> Signup and view all the answers

    What is the frequency range of the VOR signal?

    <p>108-118 MHz</p> Signup and view all the answers

    Why is the VOR system strictly line-of-sight?

    <p>Because VOR signals are blocked by solid objects</p> Signup and view all the answers

    How does the VOR receiver determine the direction of the VOR transmitter?

    <p>By sensing the phase difference between the two signals</p> Signup and view all the answers

    What type of modulation is used for the reference signal in a VOR system?

    <p>Amplitude Modulation (AM)</p> Signup and view all the answers

    What does the VOR system provide to an aircraft?

    <p>Only bearing to a station</p> Signup and view all the answers

    What is the purpose of the glideslope signal in an Instrument Landing System?

    <p>To provide vertical guidance to the aircraft</p> Signup and view all the answers

    Where is the glideslope transmitter and antenna located?

    <p>Near the runway threshold</p> Signup and view all the answers

    What is the frequency range of the glideslope signal channels?

    <p>328-335 MHz</p> Signup and view all the answers

    What is the shape of the glideslope signal radiated by the transmitter?

    <p>Two intersecting lobes</p> Signup and view all the answers

    What is the modulation frequency of the upper lobe of the glideslope signal?

    <p>90 Hz</p> Signup and view all the answers

    At what angle above the horizontal does the line of equal modulation define the glideslope approach path?

    <p>3°</p> Signup and view all the answers

    What is the acronym LASER an abbreviation for?

    <p>Light Amplification by Stimulated Emission of Radiation</p> Signup and view all the answers

    What is a characteristic of the light produced by a laser?

    <p>It is of specific wavelength and the waves are in phase</p> Signup and view all the answers

    What happens to the person walking with the direction of rotation on the merry-go-round platform?

    <p>They need to take shorter steps to complete the journey</p> Signup and view all the answers

    What is similar to the phenomenon of the laser gyro in the merry-go-round platform example?

    <p>Walking on an escalator</p> Signup and view all the answers

    What is the purpose of a laser gyro in an aircraft?

    <p>To provide navigation outputs</p> Signup and view all the answers

    What is the type of gyro used in the context of the passage?

    <p>Ring Laser Gyro</p> Signup and view all the answers

    What type of information is generally updated every 28 days by maintenance personnel?

    <p>Waypoints and airways</p> Signup and view all the answers

    What is the primary limitation of barometric altimeters?

    <p>Inaccurate readings in mountainous areas</p> Signup and view all the answers

    What do radio altimeters use to measure the height of an aircraft?

    <p>Radar signals</p> Signup and view all the answers

    What is the name of the system that measures altitude by reference to local air static pressure?

    <p>Barometric Altimeter</p> Signup and view all the answers

    What are the two basic methods used for measuring height in altimeters?

    <p>Pulsed systems and Frequency Modulated Continuous Wave systems</p> Signup and view all the answers

    What is the term used to describe the Frequency Modulated Continuous Wave systems?

    <p>Radio Altimeter</p> Signup and view all the answers

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