Automation System
Standard computer control products:

All of these
are available off the shelf
are very expensive and not cost effective
do not exist yet
None of these

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Automation System
D/A (digital to analog) conversion:

must be fed through a filter to reproduce the original signal accurately
has to be sampled at 1/2 the highest input frequency
both (b) and (c)
results in a binary code as the final output
None of these

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Automation System
An aneroid barometer

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

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