Automation System
An encoder:

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

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Automation System
A continuous process is:

used only for simple tasks
self-contained in that raw materials enter the process and an identifiable products exits the process.
None of these
used only with analog controllers.
one that never shuts down

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