Automation System
The Ziegler-Nichols method:

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

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Automation System
Time proportioning control:

cannot use a TM990 micro¬computer
is less efficient than normal PID control
None of these
a and b above.
can be used on a PM550 programmable process controller

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Automation System
The program execution time:

will vary depending on the language used
All of these
cannot be changed once the program is written
must be slower than the fastest mechanical operation that is to be controlled
None of these

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