Automation System
Semiconductor devices:

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

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

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

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