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

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

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Automation System
The program execution time:

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

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Automation System
Trend analysis:

None of these
requires a very expensive system to implement
is a brand new concept
can improve control system response
is used only in financial planning

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