Automation System
Digital signals:

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

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Automation System
What is the process lag?

None of these
All of these
The time it takes for the mass of the process to respond to an input change.
The lag in the error signal when the setpoint is changed.
The time it takes for the sensor to respond to a changed.

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