Automation System
Today, programmable controllers:

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

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Automation System
An aneroid barometer

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

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Automation System
Semiconductor devices:

have a very short infant mortality period
All of these
are less reliable than electro¬mechanical components
usually have a very short MTBF (mean time between failure)
None of these

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