Automation System
A stepping motor;

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

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Automation System
High-level languages:

are "procedure-oriented"
require knowledge of the computer design
None of these
are very difficult to use
cannot be used with automatic systems.

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Automation System
A dc servo motor:

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

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