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

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
both (b) and (c)

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Automation System
Speech recognition:

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

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Automation System
How is the integral mode implemented on a digital controller?

the digital controller cannot handle integral mode
the error signal is summed over a discrete time interval and accumulated by the controller
None of these
All of these
the error is divided into discrete amounts

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