Automation System
The Ziegler-Nichols method:

is a graphical solution method
a and b above
is a method of control
None of these
can be used to determine gain factors of a PI loop

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Automation System
A solenoid:

None of these
is related to an aneroid
can be used only in de circuits
is spring operated
is widely used in industrial automation

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Automation System
Trend analysis:

requires a very expensive system to implement
is used only in financial planning
can improve control system response
is a brand new concept
None of these

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