Aeroplane Aerodynamics: Altimeter Mechanism
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Questions and Answers

What is the primary function of a bimetallic strip in temperature sensors?

  • To measure the pressure of a system
  • To detect changes in humidity
  • To regulate the flow of liquids
  • To compensate for temperature changes (correct)
  • What is the main purpose of a bimetallic U-shaped bracket in an altimeter?

  • To increase the accuracy of the altimeter
  • To compensate for changes in temperature (correct)
  • To amplify the pressure signal
  • To reduce the weight of the altimeter
  • What happens to the elasticity of the capsule material when the temperature decreases?

  • It remains the same
  • It becomes zero
  • It increases (correct)
  • It decreases
  • What is the effect of a decrease in temperature on the U-shaped bracket?

    <p>It causes the limbs to bend inwards</p> Signup and view all the answers

    What is the primary cause of the temperature coefficient of the instrument?

    <p>The change in elasticity of the capsule material</p> Signup and view all the answers

    What would happen to the altimeter reading if the temperature were to decrease and there were no temperature compensation?

    <p>It would over-read</p> Signup and view all the answers

    What is the primary purpose of the 10 000-foot pointer in an altimeter?

    <p>To serve as a passive low-altitude warning device</p> Signup and view all the answers

    What occurs to the striped disc in the 10 000-foot pointer as the aircraft climbs above 10 000 feet?

    <p>It gradually retracts from view</p> Signup and view all the answers

    What is the purpose of the vibrator in some aircraft's altimeter?

    <p>To prevent the delicate gearing from sticking</p> Signup and view all the answers

    What causes the aneroid capsules to expand in an altimeter?

    <p>A decrease in air pressure outside the aircraft</p> Signup and view all the answers

    What is the purpose of the tubing and hose in an altimeter?

    <p>To conduct the static pressure outside the aircraft to the instrument case</p> Signup and view all the answers

    What is the significance of the 10 000-foot segment in the 10 000-foot pointer?

    <p>It represents 10 000 feet</p> Signup and view all the answers

    What is the approximate expansion of the capsule for an ascent from sea level to 30,000 ft?

    <p>7 mm</p> Signup and view all the answers

    What is the purpose of stacking aneroid capsules in an instrument?

    <p>To increase the sensitivity of the instrument</p> Signup and view all the answers

    What is the difference between an aneroid capsule and a bellows?

    <p>A bellows is generally not evacuated and made from more rugged material</p> Signup and view all the answers

    What is the purpose of an aneroid capsule in an aircraft?

    <p>To measure atmospheric pressure and altitude</p> Signup and view all the answers

    What is the mechanism used to transfer linear movement into rotary movement in an altimeter?

    <p>A combination of pivoted levers, sector gears, and flexible cord or linked fusee chain</p> Signup and view all the answers

    What can happen to a pitot probe if it is operated for too long on the ground?

    <p>The heating element can burn out</p> Signup and view all the answers

    Why is it important to keep the area around fuselage-mounted static ports clean?

    <p>To ensure accurate air pressure readings</p> Signup and view all the answers

    What is the relationship between the pressure change and the expansion of the aneroid capsule?

    <p>The capsule expands 0.01 mm for each millibar of pressure change</p> Signup and view all the answers

    What can happen if pitot heaters are operated with protective covers fitted?

    <p>There is a risk of fire</p> Signup and view all the answers

    Why should you always test the temperature of a pitot probe with the back of your hand?

    <p>To prevent burn injuries</p> Signup and view all the answers

    What can cause damage to the profile of all openings on a pitot probe?

    <p>Excessive heat</p> Signup and view all the answers

    What is the purpose of a 'salt shaker' design on some static ports?

    <p>To prevent wasps from entering the port</p> Signup and view all the answers

    What is the purpose of the two screws in the unpainted area?

    <p>To attach a test adaptor for static system testing</p> Signup and view all the answers

    What material is used to make the pipelines to prevent corrosion?

    <p>Light alloy and/or Tungum</p> Signup and view all the answers

    Why are the pitot lines usually smaller in diameter than the static lines?

    <p>To prevent cross connection</p> Signup and view all the answers

    What is used to identify a pipeline at regular intervals along its length?

    <p>Appropriately coded tape</p> Signup and view all the answers

    Why is it necessary to guard against water accumulation in the system?

    <p>To prevent water restriction and indication errors</p> Signup and view all the answers

    What is the purpose of the colour coding of the pipelines?

    <p>To guard against cross connection</p> Signup and view all the answers

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