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

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

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Automation System
An aneroid barometer

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

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