Automation System
The Ziegler-Nichols method:

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

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Automation System
A sequence controller:

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

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Automation System
A semi-continuous operation means:

a computer is a required part of the machine
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
the operation is continuous each shift, but stops between shifts
None of these
coffee breaks are allowed for the operator

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