Automation System
What Is a process variable?

A controlled variable
A process parameter that changes value
None of these
All of these
A manipulated variable

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Automation System
A dc servo motor:

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

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Automation System
Semiconductor devices:

All of these
have a very short infant mortality period
None of these
usually have a very short MTBF (mean time between failure)
are less reliable than electro¬mechanical components

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