Automation System
An aneroid barometer

is very unreliable
None of these
measures pressure by sensing deflection of an evacuated chambers.
can measure only atmospheric pressure
can be used to measure gas or liquid flow rates

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Automation System
Pressure sensors:

use capacitive variations to sense pressure
use an aneroid chamber with a variable resistance output
use the piezoresistive effect in strain gauge sensors
None of these
All of these

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