Automation System
A Hall effect switch is usually used to:

measure temperature
sense a vacuum
measure voltage
None of these
sense the presence of a magnetic object.

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Automation System
The computer graphics system called SKETCHPAD was demonstrated at

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

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