Automation System
A dc servo motor:

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

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Automation System
The SKETCHPAD system

consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
is expensive because it is sophisticated and make demands on the power and resources of the computer.
All of these
is used for interactive Graphics
None of these

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