Automation System
Direct Numerical Control means:

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

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Automation System
Programmable controllers:

None of these
(a) and (c) above
are programmed using relay ladder logic
are widely used in many different industries
cannot perform functions other than relay logic

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