Automation System
Programmable controllers:

(a) and (c) above
are widely used in many different industries
are programmed using relay ladder logic
cannot perform functions other than relay logic
None of these

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

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

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