Automation System
Today, programmable controllers:

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

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Automation System
An aneroid barometer

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

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Automation System
The program execution time:

None of these
must be slower than the fastest mechanical operation that is to be controlled
All of these
will vary depending on the language used
cannot be changed once the program is written

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Automation System
Straight-line operations:

can include diagonal cuts if they aren't curved
None of these
All of these
must be parallel to one of the axes of the coordinate system
must be limited to two per workpiece

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