Automation System
Which of these controller types is the most accurate?

Proportional
Proportional plus derivative
Three mode
None of these
Proportional plus integral

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Automation System
Semiconductor devices:

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

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Automation System
A dc servo motor:

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

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