Automation System
Today, programmable controllers:

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

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Automation System
Numerical control:

applies only to milling machines
All of these
is a method for controlling the operation of a machine by means of a set of instructions
is a method for producing an exact number of parts per hour
None of these

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Automation System
Semiconductor devices:

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

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