Automation System
The Ziegler-Nichols method:

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

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Automation System
How is the integral mode implemented on a digital controller?

the error is divided into discrete amounts
None of these
the error signal is summed over a discrete time interval and accumulated by the controller
the digital controller cannot handle integral mode
All of these

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Automation System
A sequence controller:

None of these
is a mechanical only controller
is no longer in widespread use
performs on/off control functions in relation to time.
is difficult to program

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Automation System
A dc servo motor:

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

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