Automation System
Most industrial control applications:

must have the process specified correctly to be successful
All of these
can be done more reliably using solid-state methods
can be solved using more than one method of control
None of these

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Automation System
Digital signals:

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

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