Automation System
The SKETCHPAD system

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

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Automation System
What is offset error?

None of these
All of these
the difference between the control setpoint value and the actual value.
the difference between the sensor input and the absolute sensed parameter.
the difference between the controller output and the setting of the manipulated variable.

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Automation System
Stepping motors:

do not require commutators
can run at varying speeds
All of these
can run both clockwise and counterclockwise
can be built to index different amounts by changing the pole configuration

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