Automation System
A process controller:

can solve a PID process control equation easily
can interface to digital and analog I/O
is useful in a continuous process control application
None of these
All of these

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Automation System
Digital signals:

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

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