Automation System
Sensors:

are not important in automation
will be much smarter and more sophisticated in the future
probably will not improve over the next decade
None of these
are easily developed

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Automation System
What is offset error?

None of these
All of these
the difference between the control setpoint value and the actual value.
the difference between the sensor input and the absolute sensed parameter.
the difference between the controller output and the setting of the manipulated variable.

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Automation System
Relay ladder logic is used in a PC because:

None of these
it is the best industrial control language ever developed.
it is impossible to write a control program for a machine in any other logic
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
All of these

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