Automation System
Time proportioning control:

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

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Automation System
Numerical control:

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

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