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

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

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Automation System
What is proportional control?

None of these
It has a discrete output for each error value
All of these
The gain is independent of offset error.
The controller output varies continuously over a range

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