Automation System
A stepping motor;

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

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Automation System
Most industrial control applications:

must have the process specified correctly to be successful
All of these
can be done more reliably using solid-state methods
can be solved using more than one method of control
None of these

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Automation System
A dc servo motor:

uses a variable dc voltage for speed control
All of these
None of these
uses a tachometer for speed feedback
can provide precise position control

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