Automation System
An aneroid barometer

can be used to measure gas or liquid flow rates
measures pressure by sensing deflection of an evacuated chambers.
None of these
is very unreliable
can measure only atmospheric pressure

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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
Today, programmable controllers:

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

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