Automation System
The coordinate system used to describe a workpiece:

is defined with respect to a point on the machine
All of these
changes from part to part
None of these
is always two-dimensional

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Automation System
Programmable controllers:

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

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Automation System
Direct Numerical Control means:

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

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