Automation System
The program execution time:

will vary depending on the language used
All of these
must be slower than the fastest mechanical operation that is to be controlled
None of these
cannot be changed once the program is written

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

both (b) and (c)
None of these
results in a binary code as the final output
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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