B - Pressure sensing (17-05-18) Flashcards
What is guage pressure?
The differential pressure relative to ambient air or difference between 2 pressures
What is an aneroid capsule?
A partially evacuated, sealed capsule.
What is a leaf spring?
A piece that helps capsules maintain their original shape after expanding or contracting.
What are bellows?
Essentially the same as capsules but for higher pressures.
What are diaphrams in terms of measuring pressure?
A barrier that moves with changing pressure.
What are bourdon tubes?
A tube that unravels with an increase in pressure (high pressure devices, like hydraulic devices.)
What is a transducer?
A component that transforms pressure readings into an electronic signal.
What kind of pressure is exerted by ambient air?
Static pressure
What kind of pressures make up total/pitot/impact/stagnation pressure?
Dynamic and static
What kind of pressure does movement of flow cause?
Dynamic pressure
What is the difference between pitot and pressure heads?
Pressure heads also contain static ports whereas pitot heads only contain the pitot tube.
How does a pitot tube deal with water entering the tube and how does this effect its readings?
A small drainage hole is included which releases water and this is calibrated out by the manufacturer.
How to pitot tubes deal with icing?
They have a heat element which melts ice
Where are pitot tubes located for large jet aircraft?
On the side of the fuselage forward of the wing.
Where are pitot tubes located for light aircraft?
Below the wing
