The "Bourdon tube" is used to measure:
temperature.
fuel flow.
vibrations.
pressure.
The pressure probe used to measure the pressure of a low pressure fuel pump is:
a Bourdon tube.
a bellows sensor.
an aneroid capsule.
a differential capsule.
The probe used to measure the air intake pressure of a gas turbine engined powerplant is:
Different pressure sensors are used according to the intensity of the pressure measured (low, medium or high). Classify the following sensors by order of increasing pressure for which they are suitable:
1) bellows type 2) Bourdon tube type 3) aneroid capsule type
3,1,2
1,2,3
3,2,1
2,1,3
A "Bourdon tube" is used in:
vibration detectors.
pressure sensors.
smoke detectors.
turbine temperature probes.
The engine instrument utilising an aneroid pressure diaphragm is the:
oil pressure gauge.
manifold pressure gauge.
fuel pressure gauge.
oil temperature gauge.
If a manifold pressure gauge consistently registers atmospheric pressure, the cause is probably:
ice in induction system.
too high float level.
fuel of too low volatility.
leak in pressure gauge line.
A manifold pressure gauge of a piston engine measures
fuel pressure leaving the carburettor.
vacuum in the carburettor.
absolute pressure in intake system near the inlet valve.
absolute air pressure entering the carburettor.
An aneroid capsule: 1) measures differential pressure 2) measures absolute pressure 3) is used for low pressure measurement 4) is used for very high pressure measurement The combination regrouping all the correct statements is:
1, 3
2, 3
2, 4
1, 4
On Ale with a fuel pressure gauge, where is the pressure normally measured? (Aircraft with fuel injection)
Tank outlet.
Selector valve outlet.
At the injection nozzles.
Inlet of the fuel injection metering unit.
Absolute pressure is:
the difference between two pressures.
the amount the pressure has been raised with reference to an initial level.
measured from zero pressure (vacuum).
pressure in a confined area.
A thermocouple can be made of:
a single wire coil.
two metal conductors of the same nature fixed together at two points.
a three wire coil.
two metal conductors of different nature fixed together at two points.
The temperature measured by the CHT (Cylinder Head Temperature) probe is the:
temperature of the exhaust gases.
average temperature within the whole set of cylinders.
temperature within the hottest cylinder, depending on its position in the engine block.
temperature of the carburettor to be monitored when the outside air temperature is between -5°C and 10°C.
To permit turbine exit temperatures to be measured, gas turbines are equipped with thermometers which work on the following principle:
bi-metallic strip.
thermocouple.
liquid expansion.
gas pressure.
A millivoltmeter measuring the electromotive force between the "hot junction" and the "cold junction" of a thermocouple can be directly graduated in temperature values provided that the temperature of the:
hot junction is maintained constant.
cold junction is maintained constant.
cold junction is maintained at 15°C.
hot junction is maintained at 15°C.
The main advantage of a ratiometer-type temperature indicator is that it:
carries out a measurement independent of the supply. voltage.
can operate without an electrical power supply.
is very accurate.
is very simple.
The measurement of the turbine temperature or of the EGT is carried out at the:
intake of the high pressure chamber.
outlet of the combustion chamber.
inlet of the combustion chamber.
outlet of the high pressure stage of the turbine.
