Automation System
An encoder:

can have only four keys
converts an input to a binary number
None of these
converts a binary number to a decimal number.
is used to send telegraph signals

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Automation System
Numerical control:

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

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