Automation System
Computer-based controllers:

are very flexible
should be built in a modular fashion wherever possible
are very difficult to change
None of these
(a) and (c) above

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Automation System
A process controller:

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

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Automation System
An aneroid barometer

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

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