Automation System
Today, programmable controllers:

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
are more powerful then the first controllers on the market
All of these

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Automation System
The program counter:

counts the number of instructions that have been executed
None of these
decides which program to run
is where arithmetic is done in a computer.
contains the address of the next instruction to be executed

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Automation System
An aneroid barometer

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

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