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

both (b) and (c)
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

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Automation System
Semiconductor devices:

None of these
have a very short infant mortality period
usually have a very short MTBF (mean time between failure)
All of these
are less reliable than electro¬mechanical components

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