Automation System
Most continuous control actuators:

(b) and (c) above
are used with standard continuous control loop
use a 4 to 20 mA current loop input
are of the time proportioning type
None of these

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

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
results in a binary code as the final output
both (b) and (c)

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