Automation System
For a type 2 system, the steady-state:

error for a step input is always zero
All of these
input for acceleration input is always non-zero
None of these
error for a velocity input is always zero

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Automation System
The SKETCHPAD system

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.
All of these
None of these
is used for interactive Graphics

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Automation System
The computer graphics system called SKETCHPAD was demonstrated at

University of Aston, Birmingham, 1960
Cranfield Institute of Technology, London, 1962
Massachusetts Institute of Technology in 1963
Imperial college of Science and Technology, London, 1973
None of these

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