Automation System
Direct Numerical Control means:

None of these
complete elimination of a need for a human operator.
using several computers to control one large machine
eliminating computers from the manufacturing process
using one computer to control several machines

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Automation System
Time proportioning control:

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

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