Automation System
Digital signals:

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

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Automation System
What is proportional control?

The gain is independent of offset error.
The controller output varies continuously over a range
All of these
None of these
It has a discrete output for each error value

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