Automation System
The APT (automatically progra-mmed tools) language is used with:

drafting systems
None of these
numerical controlled machines.
programmable controllers
large automation systems

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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
All of these
the digital controller cannot handle integral mode
the error is divided into discrete amounts
None of these

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

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

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