Automation System
Standard computer control products:

are very expensive and not cost effective
All of these
None of these
do not exist yet
are available off the shelf

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Automation System
Digital signals:

have a sinusoidal shape.
None of these
have a frequency measured in units of hertz
can have three possible levels
are assigned values of 1 or 0 depending on the voltage level

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

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

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Automation System
Speech recognition:

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

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