Automation System
Digital signals:

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

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Automation System
A discrete parts process is:

None of these
often encountered in manufacturing
normally a repetitive series of operations
the same as a continuous process except a different controller must be used
(b) and (c)

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