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

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

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Automation System
An aneroid barometer

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

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