Automation System
A set of well-defined procedures based on mathematical and geometric formulas for solving a problem in a finite number of steps is called:

a permutation
a geometric model
arithmetic logic
None of these
an algorithm

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

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

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

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

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