Aeroplane Systems: Temperature Measurement
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Questions and Answers

What is a characteristic of the resistance versus temperature function of platinum?

  • It is highly dependent on humidity
  • It is highly non-linear
  • It is only applicable at low temperatures
  • It is very stable and near linear (correct)
  • What is the purpose of the calibrating or balancing coil in a resistance temperature bulb?

  • To amplify the signal from the sensor
  • To increase the sensitivity of the sensor
  • To provide a standard constant temperature/resistance characteristic (correct)
  • To reduce the effect of radiation and conduction losses
  • What is the material used to make the casing of a resistance temperature bulb?

  • Stainless-steel (correct)
  • Aluminum
  • Copper
  • Titanium
  • What is the name of the network used to measure resistance in a resistance temperature bulb?

    <p>Wheatstone Bridge</p> Signup and view all the answers

    What type of thermistor is platinum?

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

    What is the location of the resistance element in a resistance temperature bulb?

    <p>At the bottom of the former, closest to the sensed liquid or gas</p> Signup and view all the answers

    What is the primary source of energy for thermocouple systems?

    <p>Heat energy at the source of measurement</p> Signup and view all the answers

    What is a common application of thermocouple systems?

    <p>Very high temperature measurement and control</p> Signup and view all the answers

    What type of information can thermocouple systems provide for engine operation?

    <p>Engine temperature</p> Signup and view all the answers

    What is a characteristic of Type K thermocouples?

    <p>Inexpensive and accurate</p> Signup and view all the answers

    What happens to the vapour when the temperature is reduced in a vapour-pressure temperature indicator?

    <p>It condenses</p> Signup and view all the answers

    What is the purpose of the sensor unit in an electrical-type temperature-measuring device?

    <p>To detect changes in temperature</p> Signup and view all the answers

    What is the main advantage of thermocouple systems over variable resistance systems?

    <p>Independence from external electrical supply</p> Signup and view all the answers

    What happens to the resistance of PTC materials when the temperature increases?

    <p>It increases</p> Signup and view all the answers

    What is the purpose of monitoring engine temperature at various critical locations?

    <p>To determine engine operating conditions</p> Signup and view all the answers

    What type of materials are used in aircraft resistance thermometry?

    <p>Highly pure metals, such as nickel and platinum</p> Signup and view all the answers

    What is the effect of changing temperature on the resistance of NTC materials?

    <p>It decreases</p> Signup and view all the answers

    What is the function of the moving-coil-type indicator in an electrical-type temperature-measuring device?

    <p>To display the measured temperature</p> Signup and view all the answers

    What is the primary function of an altitude switching unit?

    <p>To provide a warning at a preset altitude</p> Signup and view all the answers

    What is the major limiting factor in designing an altitude switching unit?

    <p>The load on the capsule sensing element</p> Signup and view all the answers

    Where is an accelerometer typically mounted in an aircraft?

    <p>Near the aircraft's normal centre of gravity</p> Signup and view all the answers

    What is the unit of calibration for an accelerometer?

    <p>g units</p> Signup and view all the answers

    What is the reading on an accelerometer when an aircraft is at rest?

    <p>1 g positive</p> Signup and view all the answers

    What is the primary purpose of using an accelerometer in non-aerobatic aircraft?

    <p>To record the loads placed on an airframe during its life</p> Signup and view all the answers

    What is the purpose of a 'G' meter in an aircraft?

    <p>To determine the apparent gravitational force being applied to the aircraft</p> Signup and view all the answers

    What is the normal force of gravity experienced in normal straight and level flight?

    <p>1-g</p> Signup and view all the answers

    What does a positive g indicate in an aircraft?

    <p>A force towards the bottom of the aircraft</p> Signup and view all the answers

    What is a critical requirement for aircraft clocks certified for Instrument Flight Rules flight?

    <p>They must be serviceable</p> Signup and view all the answers

    What is a common function of an aircraft clock besides displaying time?

    <p>Having a stopwatch function</p> Signup and view all the answers

    What is another use of an aircraft clock besides navigation?

    <p>Timing events such as auxiliary power unit start cycle</p> Signup and view all the answers

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