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

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

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Automation System
An aneroid barometer

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

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