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

results in a binary code as the final output
None of these
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)

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Automation System
A process controller:

is useful in a continuous process control application
can interface to digital and analog I/O
None of these
All of these
can solve a PID process control equation easily

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