Automation System
Digital signals:

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

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Automation System
What is the process lag?

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

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