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

None of these
All of these
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

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Automation System
Trend analysis:

is a brand new concept
is used only in financial planning
can improve control system response
requires a very expensive system to implement
None of these

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Automation System
Today, programmable controllers:

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

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