Automation System
The computer graphics system called SKETCHPAD was demonstrated at

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

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Automation System
Digital signals:

have a sinusoidal shape.
are assigned values of 1 or 0 depending on the voltage level
None of these
have a frequency measured in units of hertz
can have three possible levels

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Automation System
Light sensors:

come in a wide variety of mounting styles
never use infrared light as light source
work in direct sunlight
None of these
cannot be used a s limit switches.

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Automation System
A dc servo motor:

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

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