Automation System
An encoder:

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

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Automation System
The "walk-through" method of programming a robot involves:

All of these
physically moving the robot through all the motions it is to repeat
None of these
moving the robot from one location to another
walking through your suggested procedure with your supervisor prior to programming

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