Automation System
Digital signals:

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

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Automation System
A sequence controller:

performs on/off control functions in relation to time.
is no longer in widespread use
is a mechanical only controller
is difficult to program
None of these

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Automation System
Speech recognition:

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

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