Automation System
Direct Numerical Control means:

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

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Automation System
Time proportioning control:

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

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