Automation System
Digital signals:

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

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Automation System
What is the difference between integral and derivative control?

integral control has slower response to an error signal.
All of these
derivative control responds to a change in the rate of change in the error signal
None of these
derivative control does not eliminate offset error

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