Automation System
Digital signals:

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

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Automation System
A sequence controller:

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

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Automation System
A continuous process is:

one that never shuts down
self-contained in that raw materials enter the process and an identifiable products exits the process.
None of these
used only for simple tasks
used only with analog controllers.

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