Automation System
A process controller:

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

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Automation System
An aneroid barometer

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

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Automation System
Stepping motors:

do not require commutators
All of these
can run at varying speeds
can run both clockwise and counterclockwise
can be built to index different amounts by changing the pole configuration

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