Automation System
For a type 0 system, the steady-state:

input for acceleration input is always non-zero
(a) and (c)
error for a step input is always zero
None of these
error for a velocity input is always zero

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Automation System
The SKETCHPAD system

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

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