Automation System
An aneroid barometer

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

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

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

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