Aeroplane Systems: Temperature Measurement

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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?

Wheatstone Bridge (C) Signup and view all the answers

What type of thermistor is platinum?

PTC (D) Signup and view all the answers

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

At the bottom of the former, closest to the sensed liquid or gas (B) Signup and view all the answers

What is the primary source of energy for thermocouple systems?

Heat energy at the source of measurement (C) Signup and view all the answers

What is a common application of thermocouple systems?

Very high temperature measurement and control (B) Signup and view all the answers

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

Engine temperature (C) Signup and view all the answers

What is a characteristic of Type K thermocouples?

Inexpensive and accurate (B) Signup and view all the answers

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

It condenses (B) Signup and view all the answers

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

To detect changes in temperature (A) Signup and view all the answers

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

Independence from external electrical supply (D) Signup and view all the answers

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

It increases (B) Signup and view all the answers

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

To determine engine operating conditions (C) Signup and view all the answers

What type of materials are used in aircraft resistance thermometry?

Highly pure metals, such as nickel and platinum (C) Signup and view all the answers

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

It decreases (B) Signup and view all the answers

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

To display the measured temperature (D) Signup and view all the answers

What is the primary function of an altitude switching unit?

To provide a warning at a preset altitude (D) Signup and view all the answers

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

The load on the capsule sensing element (C) Signup and view all the answers

Where is an accelerometer typically mounted in an aircraft?

Near the aircraft's normal centre of gravity (C) Signup and view all the answers

What is the unit of calibration for an accelerometer?

g units (C) Signup and view all the answers

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

1 g positive (C) Signup and view all the answers

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

To record the loads placed on an airframe during its life (B) Signup and view all the answers

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

To determine the apparent gravitational force being applied to the aircraft (C) Signup and view all the answers

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

1-g (C) Signup and view all the answers

What does a positive g indicate in an aircraft?

A force towards the bottom of the aircraft (D) Signup and view all the answers

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

They must be serviceable (D) Signup and view all the answers

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

Having a stopwatch function (C) Signup and view all the answers

What is another use of an aircraft clock besides navigation?

Timing events such as auxiliary power unit start cycle (B) Signup and view all the answers