Automation System
Time proportioning control:

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

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Automation System
The program execution time:

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

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