Earth's Magnetic Poles
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Questions and Answers

What is the location of the Earth's magnetic south pole?

  • At 74°N 101°W (correct)
  • At the geographic North Pole
  • At the magnetic North Pole
  • At the equator

    • Why do aeronautical charts need to be periodically updated?

  • Due to changes in aircraft heading
  • Due to the shift in the magnetic poles and lines of flux (correct)
  • Due to changes in the Earth's geographic poles
  • Due to variations in the Earth's magnetic field

    • What is the direction that a magnetic compass aligns to?

  • Magnetic North (correct)
  • Geographic North Pole
  • True North
  • The Earth's axis

    • What is the term for the difference between true north and magnetic north at a geographic location?

    <p>Magnetic Variation</p> Signup and view all the answers

    What is the direction of the grid of an aeronautical navigation chart?

    <p>Towards True North</p> Signup and view all the answers

    What does not affect magnetic variation?

    <p>Aircraft heading</p> Signup and view all the answers

    Why is the instrument panel not an ideal place to install a direct-reading compass?

    <p>Due to the concentration of magnetic fields around it</p> Signup and view all the answers

    What is the main advantage of mounting the magnetic compass sensing element away from the instrument panel?

    <p>To eliminate the problem of interfering magnetic fields</p> Signup and view all the answers

    What is the primary component of a pure remote-indicating compass system?

    <p>A magnetic field detector and a heading indicator</p> Signup and view all the answers

    What is the benefit of incorporating a directional gyro in a remote-indicating compass system?

    <p>It provides inherent stability during turns and acceleration changes</p> Signup and view all the answers

    What is the purpose of a flux valve in a remote-indicating compass system?

    <p>To provide long-term reliability of the display</p> Signup and view all the answers

    What is the primary limitation of a pure remote-indicating compass system?

    <p>It suffers from many inherent problems</p> Signup and view all the answers

    What is the primary function of the flux valve in remote indicating compasses?

    <p>To detect the Earth's magnetic field</p> Signup and view all the answers

    What is the purpose of the Hooke's joint in the flux valve design?

    <p>To permit the sense element to tilt to about 25°</p> Signup and view all the answers

    What is the characteristic property of Permalloy, the material used to manufacture the spokes and horns?

    <p>It is easily magnetised, but loses all its magnetism once the external force is removed</p> Signup and view all the answers

    What is the purpose of the damping oil in the flux valve assembly?

    <p>To minimise pendulous jarring caused by rapid attitude changes</p> Signup and view all the answers

    Why is navigating in the vicinity of the poles difficult with a flux valve compass?

    <p>Because the Earth's magnetic field is too weak</p> Signup and view all the answers

    What is the function of the collector horns in the flux valve assembly?

    <p>To act as individual flux collectors</p> Signup and view all the answers

    What is the purpose of an electronic compass calibrator?

    <p>To alter the alignment of a magnetic field around a flux valve</p> Signup and view all the answers

    What is the effect of the Earth's magnetic field on the voltage induced in each secondary coil?

    <p>It modifies the voltage output slightly</p> Signup and view all the answers

    What is the purpose of the collector horns in the flux valve?

    <p>To concentrate the magnetic field</p> Signup and view all the answers

    What is the function of a datum compass?

    <p>To take readings at a certified compass swinging site</p> Signup and view all the answers

    What determines the direction and intensity of the magnetic field through each leg of the flux valve?

    <p>The angular relationship of the flux detector to the Earth's magnetic field</p> Signup and view all the answers

    How does an inertial navigation system relate to a compass?

    <p>It is used to swing a remote or direct reading compass</p> Signup and view all the answers

    What is the function of the primary winding in the flux valve?

    <p>To induce a magnetic field in each spoke</p> Signup and view all the answers

    What is a characteristic of a complex aircraft operated by large organisations?

    <p>It has access to an electronic compass calibrator system</p> Signup and view all the answers

    What is the output of the flux valve when it's not exposed to an external magnetic field?

    <p>A three-wire output with equal voltages</p> Signup and view all the answers

    What is the purpose of a certified compass swinging site?

    <p>To obtain a magnetic heading unaffected by local deviation</p> Signup and view all the answers

    What is the process of taking a reading with a datum compass?

    <p>By sighting an external reference point on the aircraft</p> Signup and view all the answers

    What is the result of the modification of the voltage output from the secondary coils?

    <p>An indication of the aircraft's heading</p> Signup and view all the answers

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