Automation System
Actuators are used to:

sense an object
activate a chemical
make a mechanical movement
All of these
None of these

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

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

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