Automation System
A process controller:

is useful in a continuous process control application
All of these
None of these
can interface to digital and analog I/O
can solve a PID process control equation easily

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Automation System
An aneroid barometer

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

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