Automation System
How is the integral mode implemented on a digital controller?

All of these
the error is divided into discrete amounts
the digital controller cannot handle integral mode
the error signal is summed over a discrete time interval and accumulated by the controller
None of these

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Automation System
What is offset error?

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.
None of these
All of these

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Automation System
A solenoid:

is related to an aneroid
None of these
is widely used in industrial automation
can be used only in de circuits
is spring operated

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Automation System
The program execution time:

None of these
will vary depending on the language used
must be slower than the fastest mechanical operation that is to be controlled
All of these
cannot be changed once the program is written

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