Automation System
One advantage of a PC in industrial control is that it:

has a reliable long life compared to relay logic
is very difficult for the inexperienced programmer to understand
All of these
None of these
is unreliable because there are no moving parts

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Automation System
What is the process lag?

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.
All of these
None of these

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