Automation System
A flexible manufacturing system may be:

All of these
None of these
expensive to alter
an automated assembly line
very difficult to change when new products are introduced

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Automation System
Today, programmable controllers:

are more powerful then the first controllers on the market
are relatively low cost compared with the original digital equipment available for industrial control
All of these
None of these
can be cost effective even when replacing just a few relays

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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
All of these
the digital controller cannot handle integral mode
None 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.
None of these
All of these
it is impossible to write a control program for a machine in any other logic

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