Automation System
An encoder:

converts an input to a binary number
can have only four keys
converts a binary number to a decimal number.
None of these
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
one that never shuts down
used only with analog controllers.

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Automation System
Relay ladder logic is used in a PC because:

it is the best industrial control language ever developed.
All of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
None of these
it is impossible to write a control program for a machine in any other logic

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