Automation System
Four basic elements are required for an automated machine tool or production process. They are: input interface, memory, output interface and:

software
NC tape programming
computer graphics workstation
logic
None of these

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Automation System
A dc servo motor:

uses a tachometer for speed feedback
uses a variable dc voltage for speed control
All of these
None of these
can provide precise position control

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

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

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