Automation System
Time proportioning control:

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

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Automation System
Numerical control:

applies only to milling machines
is a method for producing an exact number of parts per hour
is a method for controlling the operation of a machine by means of a set of instructions
All of these
None of these

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