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

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

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Automation System
Relay ladder logic is used in a PC because:

most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
it is impossible to write a control program for a machine in any other logic
None of these
All of these
it is the best industrial control language ever developed.

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Automation System
Speech recognition:

All of these
will never be used in industrial controls
is already widely used in industrial controls
will be used in more applications as the technology matures.
None of these

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