Instrument Sensing Elements and Pressure Measurements
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Questions and Answers

What happens to a bimetallic U bracket strip when there is an increase in ambient temperature?

  • It measures the ram pressure of the airstream
  • It is unaffected by pressure change and acts as a spring (correct)
  • It prevents icing in the pitot tube
  • It opposes capsule movement due to pressure change
  • What is the purpose of the static ports in a pitot static system?

  • To oppose capsule movement due to pressure change
  • To measure ram pressure of the airstream
  • To prevent icing in the pitot tube
  • To measure static pressure (correct)
  • Where are the static ports typically located on an aircraft?

  • At the front of the pitot tube
  • At the rear of the aircraft
  • On the wings
  • Along the sides of the fuselage (correct)
  • What is the function of the pitot tube in a pitot static system?

    <p>To measure ram pressure of the airstream</p> Signup and view all the answers

    What is included in a pitot/static tube?

    <p>Static ports and electric heaters</p> Signup and view all the answers

    What is the term for the system of ports and tubing on an aircraft that supplies pitot and static pressure for the instruments?

    <p>Pitot static system</p> Signup and view all the answers

    What is the reason for temperature compensation in instruments?

    <p>To compensate for temperature changes affecting instrument readings</p> Signup and view all the answers

    How does a manifold pressure gauge work?

    <p>It uses an evacuated bellows to reference measured pressure to a vacuum</p> Signup and view all the answers

    What occurs when a bimetallic strip is heated?

    <p>It curls due to the difference in expansion of the two metals</p> Signup and view all the answers

    Why is an aneroid capsule not suitable for use in cold climates?

    <p>It becomes less malleable and less responsive to pressure changes</p> Signup and view all the answers

    What is psid an alternative term for?

    <p>Psig because the pressure measured is the difference between atmospheric and the pressure under test</p> Signup and view all the answers

    What is the purpose of a bimetallic strip?

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

    What is the primary function of the bimetallic device inside the sensitive altimeter?

    <p>To provide automatic compensation for temperature changes</p> Signup and view all the answers

    What is the range of measurement of the sensitive altimeter?

    <p>Between 35 000 to 50 000 feet or more</p> Signup and view all the answers

    What is the function of the knob on the front of the altimeter?

    <p>To compensate for non-standard atmospheric pressure</p> Signup and view all the answers

    How many equally spaced marks are on the dial face of the sensitive altimeter?

    <p>10</p> Signup and view all the answers

    What is the function of the 100-foot pointer?

    <p>It rotates once around the dial for each 100-foot change in altitude</p> Signup and view all the answers

    How often does the 1000-foot pointer rotate once around the dial?

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

    What is the first variable measured in a Machmeter?

    <p>Airspeed</p> Signup and view all the answers

    What provides the altitude information in a Machmeter?

    <p>An aneroid capsule sensitive to static pressure</p> Signup and view all the answers

    What is the function of the intermediate sliding rocking shaft?

    <p>To divide the altitude unit</p> Signup and view all the answers

    How is the altimeter mechanism calibrated?

    <p>To QNE standards</p> Signup and view all the answers

    What is the advantage of combining a Machmeter and airspeed indicator into one instrument?

    <p>Saved space on the panel</p> Signup and view all the answers

    What is used to drive the indicator in a modern Mach Airspeed Indicator?

    <p>Pneumatic power and/or servomotors</p> Signup and view all the answers

    What happens to the airspeed indicator when an aircraft descends with a partial blockage in the static line?

    <p>It will overread</p> Signup and view all the answers

    What is the effect of a pitot tube blockage on the altimeter?

    <p>It has no effect</p> Signup and view all the answers

    What happens to the airspeed indicator when an aircraft climbs with a partial blockage in the static line?

    <p>It will underread</p> Signup and view all the answers

    What is the effect of a blocked pitot line on the airspeed indicator?

    <p>It shows no reading</p> Signup and view all the answers

    What happens to the airspeed indicator when an aircraft accelerates with a blocked pitot line?

    <p>It fails to display</p> Signup and view all the answers

    What is the benefit of selecting the 'alternate' static port in an aircraft with a partial blockage in the static line?

    <p>It bypasses the blockage</p> Signup and view all the answers

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