Automation System
One advantage of a PC in industrial control is that it:

is unreliable because there are no moving parts
is very difficult for the inexperienced programmer to understand
All of these
None of these
has a reliable long life compared to relay logic

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Automation System
A stepping motor;

has a commutator
is a good choice where continuous rotation is needed
can index positional movement.
None of these
has a speed proportional to voltage input

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